Hyper V guest slow disk access

I have a Hyper V cluster(2012) with a 2012 guest running 2012 acting as my file server.
My 2 hosts are connected to a gig switch stack which in turn is connected to my Dell MD3200i.
My file server has a "data" disk that is a VHD(fixed) on the iSCSI storage. As is it OS(dynamic)
I'm coping 200GB right now and only seeing data thoughtput of 8MB/sec.
When I check perfrmance on the file server the disk queue is huge. But when I check the queue for C: on the host, which is where the cluster storage appears to sit, its got a low if not no queue.
Also did a copy using the host and saw 58MB/sec so I'm happy the network should be able to pass the data.
Switch CPU is at 5%
Can anyone tell me what I'm doing wrong?

Fixed VHD always performs better than Dynamic VHD in most scenarios by roughly 10% to 15% within the exception of 4K writes, where fixed VHD performs significantly better according to the Windows Server Performance Team Blog.
Hyper-V and VHD Performance - Dynamic vs. Fixed:
http://blogs.technet.com/b/winserverperformance/archive/2008/09/19/hyper-v-and-vhd-performance-dynamic-vs-fixed.aspx
Witch doesn't match your tests, so I think you missed something in your configuration schema. Read the following guideline:
Performance Tuning Guidelines for previous versions of Windows Server:
http://msdn.microsoft.com/en-us/library/windows/hardware/dn529134
Regards,
If you found this post helpful, please give it a "Helpful" vote. If it answered your question, remember to mark it as an "Answer". This posting is provided "AS IS" with no warranties and confers no rights! Always test ANY
suggestion in a test environment before implementing!

Similar Messages

Extremely slow disk access iMac5.1

Hello, my daughter is having problems with her computer. She has a Mac5.1 ( intel ) running 10.4.11.
In the process of trying to determine the problem, I installed Xbench on her computer. The numbers for the disk access category are dismal, all others (although low) appear normal.
This disk values are:
Sequential                         0.03
    Uncached Write            0.01        0.01 MB/sec [4K blocks]
    Uncached Write            0.17        0.10 MB/sec [256K blocks]
    Uncached Read            60.40        17.68 MB/sec[4K blocks]
    Uncached Read            86.73        43.59 MN/sec[256K blocks]
Random                            1.35
    Uncached Write           15.89        0.01 MB/sec [4K blocks]
    Uncached Write            0.35        0.10 MB/sec [256K blocks]
    Uncached Read            63.58        17.68 MB/sec[4K blocks]
    Uncached Read            99.67        43.59 MN/sec[256K blocks
Aparently sequential access is much worse that random access however Apple utilities as well as Onyx claims that the disk is fine. However the computer is nearly unusable.   What else can I try? I ran an fsck on the disk, I also caused the write permissions to be corrected. I am running out of ideas.
BTW her disk is a WDC WD160JS-40TGB0. Out of 148 Gig, 110 are used and about 40 are free.
Any Ideas? Any help is greatly appreciated.

How much RAM does the iMac have and how many Applications are running concurrently or set to open at login?
40GB should be ample free space for V-RAM, but it could definitely get bogged down if there is to little RAM for the users needs.
Sometimes one will inadvertently set a bunch of stuff to automatically open at login. Go to: Apple > System Preferences > Accounts > Login Items and remove any unnecessary Application automatically set to open at login-in and then restart the computer.
Then again it could be that the HD is just suffering from age, if it has been thrashed because of continual page outs due to the lack of system memory. Because my Earlier 2006 Mac4,1 with 2GB of RAM that I upgraded (for space reasons) to a WD 320GB Hard Drive in 2009 is getting:
Disk Test
55.08
Sequential
47.67
Uncached Write
177.90
109.23 MB/sec [4K blocks]
Uncached Write
175.61
99.36 MB/sec [256K blocks]
Uncached Read
14.73
4.31 MB/sec [4K blocks]
Uncached Read
211.81
106.45 MB/sec [256K blocks]
Random
65.23
Uncached Write
25.42
2.69 MB/sec [4K blocks]
Uncached Write
182.78
58.51 MB/sec [256K blocks]
Uncached Read
93.31
0.66 MB/sec [4K blocks]
Uncached Read
172.38
31.99 MB/sec [256K blocks]
Dennis

Macbook pro mid-2012 13" has very slow disk access

Until 3 days ago my macbook pro mid-2012 13" running OX 10.8.3 was running fine. Then, it showed very slow response anytime it had to access the hard disk. After doing the usual checks and disk first aid repairs to no avail, I booted from my external disk with an older copy of my hard disk and everything then worked as normal, except when I accessed the internal hard disk, then it crawled once again (spinning beach ball, took many seconds just to open a finder window and then several minutes to display the contents). I ran the Apple Hardware Tests and it said everything was fine, even though it tooks several minutes before the test would actually start. I also ran the program BlackMagic Speed Disk to find out if the disk was having transfer speed problems and it showed a respectible transfer rate (60MB/s), not great but not like the 0.3MB/s I was getting when I tried to back up the internal disk. I was using Carbon Copy Cloner to try to back up the internal disk but had to give up since at 0.3MB/s, it would take days to back up the 250GB on the disk. I found on the web that using "restore" in Disk Utility, I could do a disk copy without the file by file copy which allowed me to back up my disk in "only" 6 hours. Booting from my newly made copy on an external disk worked fine and ran at nearly normal speed (slightly slower since it was an external disk running through USB2). As a final attempt to prove this was a disk problem, I erased the internal disk and reinstalled OSX 10.8. I am still waiting for this install to finish, it has been 5 hours although the progress bar said it should be done in 20 minutes. This was fairly convincing evidence that it is not a software or settings problem. However, all my web searches could find no other case of a problem like mine. I presume I have a failed hard disk but as all the diagnostic programs say it is working fine, I was hesitating to bring it in without hard diagnostic evidence. If anyone knows what might be the problem, it would be much appreciated to hear from you.

It should not take 5 hours to install Mac OS X. There is something wrong with the disk. Try reformatting where you do a wipe of the drive (an select the option to write zeros which will remap bad sectors). Then try to install MAc OS X.
I got this information from here:
http://reviews.cnet.com/8301-13727_7-20064489-263.html
Back up your data.
Use Time Machine or a system cloning utility to create a full and restorable backup of your data. If you suspect bad blocks, then when cloning you might consider not using a "block-level" copy process, since this will likely run into problems.
Boot to the utilities DVD.
If you have a boot DVD for a tool like Drive Genius or another drive utility, then boot to that; if not, use your OS X installation DVD (once you select your language, open Disk Utility from the Utilities menu).
Format the drive.
Using your selected utility, format the drive and check for bad blocks. If you are using Disk Utility, click the Erase tab, click the Options button, and then select the option to write zeros to the disk (you do not need to do multipass erase options, as this will provide no additional benefit for managing bad blocks). Writing to zeros may take a couple of hours depending on the size of the drive, but when done the drive will have remapped any blocks that were not reliably read.
Restore the OS installation.
If you have used Time Machine to create your backup, boot to your OS X installation DVD (if you are not using Disk Utility) and use the option in the Utilities menu to restore from backup. Attach your Time Machine drive and then proceed with the restoration, selecting the newest backup as the one to restore to your system. If you have used a system cloning tool, then attach the cloned drive and boot off of it (hold the Option key at start-up to select it from the boot menu). When you are booted to the cloned drive, run your cloning utility to copy the installation back to the computer's main boot drive.An optional approach here is to perform a full reinstallation of the OS from your installation DVD, and then migrate your data, applications, and settings from either the clone or the Time Machine backups using Apple's Migration Assistant.

Guest LDOM disk access through multiple IO domains

Hi All,
I am working on a configuration, wherein the boot disk to the Guest LDOM is being provided through an image file hosted on a VxVM diskgroup (vmdg1). The configuration has another copy of the same image file being provided through another VxVM diskgroup (vmdg2)l through another virtual disk service.
let me clear the configuration a little more in detail
A T-5240 server having 2 IO domains configured
Primary (Control domain + IO domain + Service domain) configuration
A VxVM diskgrop (vmdg1) having a boot image file
Secondary (IO domain + Service domain) configuration
A VxVM diskgroup (vmdg2) having a copy of the boot image file
these devices are exported through their respective virtual disk services with the same mpgroup name to a guest LDOM. The vdsisk is then assigned to the guest ldom which is using the volume through the primary service.
When the guest LDOM is started it starts with the disk export through the Primary domain. All writes happen fine. When the VxVM diskgroup is deported from the Primary the Guest LDOM still remains online as starts using the disk image path through the secondary domain.
I then bring the VxVM diskgroup and the mounts back online on the Primary domain and deport the diskgroup from the secondary domain to see if it failsback to the image through the Primary domain. The Guest LDOM now is in a hung state and does not allow access through the local console or through network logins.
Has anyone see such a problem? Also is it recommended to use disk based image as a backend device in mpgroups through "ldm add-vdsdev" ?
TIA,
Sudhir

As far as I know then only way to "re-balance" the I/O across the domains is to unbind/bind the guests. Not a great answer, but this could be done as part of the guests patching cycle.
I think there is an RFE to provide MPxIO-like features to guests.

Qosmio X505-Q870 with "slow" disk access

i"ve got a several month old X505 870 with 4GB of memory and TWO Hitachi 7200 rpm 500GB SATA II hard drives. The system is used primarily for initial examination of digital images, with each image being around 20MB. Accessing images to display previews is perceptibly slow. YES, the system is tuned to the best of my ability. YES, both disks have been, and are REGULARLY defragmented - both show 0% fragmentation. YES, I've thrown away the original O/S with all the trialware, stupidity, and goop, and installed W7, 64-bit. YES, all the drivers I'm aware of are current, including the Intel storage drivers. NO, other than the periodic Side-By-Side errors that show up every couple days, I'm NOT getting application or system errors.
In Bridge or Lightroom I"m not getting CPU bound, but this thing beats on the disk(s) quite a bit, and takes MUCH longer than the desktop system to display images. YES, the desktop is a slightly faster CPU, but it
also has standard 7200 rpm drives for images, and it's SIGNIFICANTLY faster at retrieving and displaying images in Bridge or Lightroom...
Is there any PRACTICAL (no, putting in 2, 500GB SSD drives is NOT practical) thing that can be done to improve disk performance on this box, 'cause right now it certainly isn't any speedster?

I don't have any empirical evidence about whether the original installation was this slow, but my recollection is the reason I dumped an re-installed a clean W7 was because the original was REALLY a dog. I also wanted to put partitions on the drives and the original installation caused problems with the partitioning... But, I'm confident that the original was definitely not faster...
As far as drivers, I believe I have everything current.
My antivirus is Microsoft Security Essentials, but I currently have it turned off. So that's probably not the issue.....
As far as "is it really slow", I can't say. It's SLOWER, but I suppose if you're not doing anything very demanding it'd probably be all right. It's just significantly slower doing what I do, than my desktop. I don't have anything else to compare it to, but it SEEMS (the ever popular "seems") to me that a quad-core with 4GB of memory and 7200 rpm drives should be extremely quick to pull up images and render previews. But, I'll admit my expectations may be too high.
Which is why I'm hoping there's something I've neglected that'll make things perform better. I even dumbed down the interface with the "best performance versus best appearance" thing to see if that'd help. Didn't.

VM Guest Slow Disk

Hi all,
Forewarning: I sort of got this stuff dumped in my lap so I am by no means close to an expert in virtualization. I apologize in advance.
Scenario:
We are using Hyper-V VMs as our build machines (Windows 7 SP1 64-bit guest OS) for all of our products. Right now I'm trying to shave time in the main solution compilation times for the one project and have been getting hardware increases on the Hyper-V
host server.
The IT admin ran SQLIO on the host (Server 2012 - not R2) and saw numbers like:
IOs/sec: 28259.00
MBs/sec: 220.77
I ran SQLIO on the VM in question and saw numbers like:
IOs/sec 4070.33
MBs/sec: 7.94
Now the host hard disk setup is 2x 10k SAS drives. I've tried plugging an SSD in and sticking one VM on there and re-running and saw no increase.
This is leading me to believe there's a wonky configuration somewhere. I have the drive set to a fixed-disk vhdx on IDE controller.
Any ideas?

Hi jmcdade11,
I ran SQLIO on the VM in question and saw numbers like:
IOs/sec 4070.33
MBs/sec: 7.94 "
This is the result of SQLIO test on win7 64bit VM with 16 vCPU ?
Please run command "fsutil fsinfo ntfsinfo X: " (X is the drive which storing win7 VHD file )in hyper-v host and check the value of "Bytes Per Sector" and "Bytes per Physical
Sector"
The SCSI disk with RAID ?
Best Regards
Elton Ji
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

Extremely Slow Disk Access from External Drives (USB & Firewire)

Following the upgrade to 10.6.2 (from 10.6.1), my computer is communicating extremely slowly with all external drives (both Firewire 400 and USB). File transfers which used to take less than a minute now take 5-10 minutes (less than 1 GB). Peering into the Console, I see messages for each aspect of a file reading: Nov 13 12:30:12 Nautilus /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder[152]: Possible unresolved transaction race -105/filename
(Nautilus is the name of the computer)
By "each aspect", I mean that for Pages files, it provides a message for Quicklook,(null) , Contents,(null) , and filename,(null).
All disks are in good health, formatted as FAT32 for ease of use with all OS types, and are SATA.
Again, this occurred immediately following the installation of 10.6.2 (both Software Update and Combo). I've seen similar errors online with iTunes libraries on network drives, but this is on directly connected drives.
I normally wouldn't ask this, but, is there a way to reinstall 10.6.1 over .2? At this point, Time Machine would likely cause me to lose other data as well in a full revert, since it has been more than a few days.

I have various personal files backed up on these drives (not system data): music, pictures, documents, etc.
FAT32 should not be an issue, as I have used these drives for over 2 years with Tiger, Leopard, and then Snow Leopard with nay an issue, until now. Additionally, while the Time Machine backup may be an archive, it is the sole occupier of an HFS-formatted partition which is not exhibiting the issue. I only included that information since it is physically on the same drive as a partition (FAT32) which is being troublesome to rule out driver/hardware problems.
Bottom line: All of my drives worked perfectly on 10.6.1 (and continue to do so on my other Macs (10.5.8), but do not on 10.6.2. I was only looking for a potential solution to my computer's specific issue, not a statement that my "compromise" is the cause of my problems.
Actually, since Apple fully supports read/write access on FAT32 partitions, I should, indeed, be able to "have all things all ways...", no offense intended.

Slow Disk Access

Hi,
I have a Dual 2.5 Ghz PowerPC G5, which has two 250GB hard disks. I also have a Lacie 250GB Firewire hard disk installed. I am using Mac OS X 10.4.4.
When use this computer the CPU and disk performance are OK. However, whenever and application uses a File Open dialog to find or save files the dialog (such as with Macrosoft Word, Macromedia Flash etc) is incredibly slow. It can take up to a minute before the application will find all the files and display them. This is incredibly frustrating. I mean, I hardly have any files! Is there anyway to fix or resolve this problem?
Thanks, David.

1. Did you try the advice in my FAQ w.r.t. Energy Saver settings? The spin-up noise may be too low for you to hear: some drives are nearly dead silent in this respect.
2. There are only two other things I can suggest:
- Open Activity Monitor (in Applications > Utilities). Sort processes in descending order by %CPU and monitor it when the problem occurs.
- Check Console for clues after the problem occurs.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

Really slow disk access

our iMac runs like a dog. I've max'd RAM, cleaned and optimized the hard drive. Configured with two non-admin users (myself & my wife - I need right-click but it drives here crazy), and an admin account. iTunes and iPhoto libraries are shared, and they are stored on an external 500g drive. in addition we have TimeMachine active to a 2tb drive thru. External drives are connected thru the USB hi-Speed bus.
Examples of slow: up to a minute to switch users, 10-20 seconds for a cursor in Spotlight, Safari takes about a minute to get "warmed up".
I decided to do a clean install of Mavericks - all previous updates/upgrades were automated via Apple and/or AppStore.
So I'm creating a redundant backup of folders on the internal drive (everything except movies, music, & photos which are on the 500g and backed up via TimeMachine on the 2tb drive). in total only 172g to copy to another 1tb drive.
I started last night, but it went to sleep and did not work all night. in total it's been working 4-6hrs last night and 8hrs today. There is still 22hrs to go!
Is there any hope for this machine?
Larry :-)
========

I watch Activity Monitor a lot, CPU never really seems to be stressed, nor the Disk. While I don't know how to read the Memory monitor, "memory presure" is typically stable at about 25%.
The terminal showed 0.0 pages written to the pagefile - taken while only doing back-up and Activity Monitor, no real change now that I'm also in Safari.
EtreCheck results:
Hardware Information:
          iMac (24-inch, Early 2008)
          iMac - model: iMac8,1
          1 2.8 GHz Intel Core 2 Duo CPU: 2 cores
          4 GB RAM
Video Information:
          ATI Radeon HD 2600 Pro - VRAM: 256 MB
Audio Plug-ins:
          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
          AirPlay: Version: 1.9 - SDK 10.9
          AppleAVBAudio: Version: 2.0.0 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
Startup Items:
          MySQLCOM: Path: /Library/StartupItems/MySQLCOM
System Software:
          OS X 10.9 (13A603) - Uptime: 27 days 2:48:17
Disk Information:
          Hitachi HDP725032GLA380 disk0 : (320.07 GB)
                    EFI (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) /: 319.21 GB (124.84 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
USB Information:
          Apple Inc. Built-in iSight
          Western Digital Ext HDD 1021 2 TB
                    disk5s1 (disk5s1) <not mounted>: 32 KB
                    Teri-02 (disk5s3) /Volumes/Teri-02: 2 TB (1.12 TB free)
          Canon MP480 series
          Western Digital My Book 1148 2 TB
                    disk3s1 (disk3s1) <not mounted>: 32 KB
                    2Teri BckUp (disk3s3) /Volumes/2Teri BckUp: 2 TB (1.32 TB free)
          Apple, Inc. Keyboard Hub
                    Apple, Inc Apple Keyboard
          Apple Computer, Inc. IR Receiver
          Apple Inc. BRCM2046 Hub
                    Apple Inc. Bluetooth USB Host Controller
FireWire Information:
          WD Passport III 800mbit - 800mbit max
                    EFI (disk1s1) <not mounted>: 209.7 MB
                    Passport HD (disk1s2) /Volumes/Passport HD: 499.76 GB (100.89 GB free)
Thunderbolt Information:
Kernel Extensions:
Problem System Launch Daemons:
          [failed] com.apple.wdhelper.plist
Problem System Launch Agents:
Launch Daemons:
          [loaded] com.adobe.fpsaud.plist
          [loaded] com.livescribe.PenCommService.plist
          [loaded] com.macpaw.CleanMyMac2.Agent.plist
Launch Agents:
User Launch Agents:
          [loaded] com.google.keystone.agent.plist
          [loaded] com.macpaw.CleanMyMac2Helper.scheduledScan.plist
          [loaded] com.macpaw.CleanMyMac2Helper.trashWatcher.plist
          [loaded] com.valvesoftware.steamclean.plist
User Login Items:
          Dropbox
3rd Party Preference Panes:
          Flash Player
Internet Plug-ins::
          Flip4Mac WMV Plugin: Version: 2.3.3.3
          FlashPlayer-10.6: Version: 11.9.900.170 - SDK 10.6
          QuickTime Plugin: Version: 7.7.3
          Flash Player: Version: 11.9.900.170 - SDK 10.6
          Default Browser: Version: 537 - SDK 10.9
          wkDimdimControl: Version: 1.01
          GarminGpsControl: Version: 4.0.3.0 Release - SDK 10.6
          Silverlight: Version: 5.1.10411.0 - SDK 10.6
          iPhotoPhotocast: Version: 7.0
User Internet Plug-ins::
          CitrixOnlineWebDeploymentPlugin: Version: 1.0.94
Bad Fonts:
          None
Old applications:
          Bluetooth Diagnostics Utility:          Version: 2.3.6 - SDK 10.0
                    /Developer/Applications/Utilities/Bluetooth/Bluetooth Diagnostics Utility.app
          Bluetooth Explorer:          Version: 2.3.6 - SDK 10.0
                    /Developer/Applications/Utilities/Bluetooth/Bluetooth Explorer.app
          BodyMedia SYNC:          Version: 1.0.1 - SDK 10.5
                    /Applications/BodyMedia SYNC.app
          CrashReporterPrefs:          Version: 10.6.3 - SDK 10.0
                    /Developer/Applications/Utilities/CrashReporterPrefs.app
          Dashcode:          Version: 3.0.2 - SDK 10.0
                    /Developer/Applications/Dashcode.app
          IBCarbonSimulator:          Version: 4.0 - SDK 10.0
                    /Developer/Platforms/MacOSX.platform/Developer/Library/Interface Builder/Plug-ins/CarbonPlugin.ibplugin/Contents/Resources/IBCarbonSimulator.app
          IBCocoaSimulator:          Version: 4.0 - SDK 10.0
                    /Developer/Platforms/MacOSX.platform/Developer/Library/Interface Builder/Plug-ins/CocoaPlugin.ibplugin/Contents/Resources/IBCocoaSimulator.app
          Instruments:          Version: 4.0 - SDK 10.0
                    /Developer/Applications/Instruments.app
          Keynote:          Version: 5.3 - SDK 10.5
                    /Applications/iWork '09/Keynote.app
          Livescribe Desktop:          Version: 2.8.3 - SDK 10.5
                    /Applications/LivescribeDesktop.app
          Numbers:          Version: 2.3 - SDK 10.5
                    /Applications/iWork '09/Numbers.app
          OpenGL Driver Monitor:          Version: 1.5 - SDK 10.0
                    /Developer/Applications/Graphics Tools/OpenGL Driver Monitor.app
          OpenGL ES Performance Detective:          Version: 1.0 - SDK 10.0
                    /Developer/Applications/Graphics Tools/OpenGL ES Performance Detective.app
          OpenGL Profiler:          Version: 4.4 - SDK 10.0
                    /Developer/Applications/Graphics Tools/OpenGL Profiler.app
          OpenGL Shader Builder:          Version: 2.1 - SDK 10.0
                    /Developer/Applications/Graphics Tools/OpenGL Shader Builder.app
          PacketLogger:          Version: 2.3.6 - SDK 10.0
                    /Developer/Applications/Utilities/Bluetooth/PacketLogger.app
          Pages:          Version: 4.3 - SDK 10.5
                    /Applications/iWork '09/Pages.app
          Plants vs:          Version: 1.0.40 - SDK 10.5
                    /Applications/Plants vs. Zombies.app
          Quartz Composer:          Version: 4.0 - SDK 10.0
                    /Developer/Applications/Quartz Composer.app
          Quartz Composer Visualizer:          Version: 1.2 - SDK 10.0
                    /Developer/Applications/Graphics Tools/Quartz Composer Visualizer.app
          Quartz Debug:          Version: 4.1 - SDK 10.0
                    /Developer/Applications/Performance Tools/Quartz Debug.app
          SLLauncher:          Version: 1.0 - SDK 10.5
                    /Library/Application Support/Microsoft/Silverlight/OutOfBrowser/SLLauncher.app
          Spin Control:          Version: 0.9.1 - SDK 10.0
                    /Developer/Applications/Performance Tools/Spin Control.app
          Syncrospector:          Version: 5.2 - SDK 10.0
                    /Developer/Applications/Utilities/Syncrospector.app
          USB Prober:          Version: 4.0.0 - SDK 10.0
                    /Developer/Applications/Utilities/USB Prober.app
          Xcode:          Version: 4.0 - SDK 10.0
                    /Developer/Applications/Xcode.app
          Xcode SSH Authentication Agent:          Version: 4.0 - SDK 10.0
                    /Developer/Library/PrivateFrameworks/IDEFoundation.framework/Versions/A/Re sources/Xcode SSH Authentication Agent.app
          Yasu:          Version: 2.8.2 - SDK 10.4
                    /Applications/Utilities/Yasu.app
          YummySoup!:          Version: 2.4 - SDK 10.5
                    /Applications/YummySoup!.app
Time Machine:
          Skip System Files: NO
          Mobile backups: OFF
          Auto backup: YES
          Volumes being backed up:
                    Macintosh HD: Disk size: 297.29 GB Disk used: 181.03 GB
                    Passport HD: Disk size: 465.44 GB Disk used: 371.48 GB
          Destinations:
                    2Teri BckUp [Local] (Last used)
                    Total size: 2
                    Total number of backups: 64
                    Oldest backup: 2013-08-05 12:04:28 +0000
                    Last backup: 2013-12-28 02:32:06 +0000
                    Size of backup disk: Adequate
                              Backup size 2 > (Disk used 552.50 GB X 3)
          Time Machine details may not be accurate.
          All volumes being backed up may not be listed.
Top Processes by CPU:
               3%          WindowServer
               1%          EtreCheck
               1%          Finder
               1%          Activity Monitor
               0%          sysmond
Top Processes by Memory:
          188 MB          Safari
          160 MB          Locum
          123 MB          mds_stores
          78 MB          Mail
          70 MB          softwareupdated
Virtual Memory Statistics:
          54 MB          Free RAM
          1.25 GB          Active RAM
          1.22 GB          Inactive RAM
          581 MB          Wired RAM
          13.12 GB          Page-ins
          965 MB          Page-outs

Very Slow Disk Access

Recently I've had to restart my PB multiple times in order for it to start up because it just sits with the Apple logo and the circle going. I booted from a backup drive, no problem, but when I attempted to reformat the drive via Disk Utilities, it would not allow it. DU went into 'not responding' mode. Now when I boot, it takes forever and there is a tremendous lag time. How do I determine if there is an actual hardware error with the drive or if Disk Warrior would be able to correct the problem (I would have to buy DW)?

You may have a cache overload.
Make sure your reset Safari if that is your bowser all the time and empty the caches on it and also on any third party software.
I empty my caches all the time on Safari, yet it still shows up I need to clean it using my NetBarrierX4. You may also empty temporary files.
And I have resorted to taking my battery out to reset my logic board when I can't fix things.
Adware and Malware and spyware and trojans can cause this also.
I reset Safari everyday. Go to Safari preferences or any brower you use and reset to empty caches....and then go to system preferences and click on security and delete any cookies. Cookie cleaning is very important...at least for me.
Let me know if any of these things work.
Worms can also cause it.

Time Capsule disk access SLOW! 2TB - Dual band

I have a Time Capsule (2TB, Dual Band, Firmare at 7.4.2)
Its been working like a dream, backing up 3 Macs for the last 8 months.
I also use it for connecting two or three other disks via USB and then making those accessible over the LAN, and there is also about 100GB of data on the Time capsule disk itself that i use as a dump for files so i can get to them from anywhere on my LAN.
Lately I started to notice EXTREMELY slow disk access, even when i am connected via ethernet (1000 base) - and equally when I am connected via wifi (n)
for example, copying over a 2Mb photo can take minutes when it should take seconds.
i've been trying to figure out whats going on here for a while and so i checked out the sizes of the backup files.. the sparseimages that time machine creates.
one of them was nearly 1TB, while another was around 500GB and the other was around 120GB
that plus my data meant there was only about 300GB free on the 2TB disk.
I have a feeling the slowness could be down to extreme fragmentation of the drive... ??
so i decided to dump the backup files and copy off my other data and do a erase of the disk and start again.. but get this.. i can't even delete the 1TB file ! I have been trying for about 3 days now and it just will not delete.. i get the Deleting msg box and it just sits there, literally ALL night...
i know it isn't just hanging on the Mac (10.6.4) because deleting the other two images also took a long time (but not this long!)
i can't just wipe the disk now because i can't get my other data off either.. I have tried copying it over the network and onto a USB disk connected directly to the Time Capsule, but 3 days later and i'm still copying files..
to put some context into this, I copied over 1.8Gb today and it took about 4 hours...
has anyone had this problem before?? what on earth is going on?? is it down to fragmentation, or something else?? the TC has been working fine up until a few weeks ago when i started to notice slow speed.
any ideas ?
thanks
Adam

if anyone ever has this issue ....
it must have been EXTREME fragmentation. I bought another 2TB external disk, connected it to the TC, did a complete archive, which took around 24 hours... then i wiped the TC and put stuff back... it now works fine again...

Windows 2008 R2 Hyper-V has really slow VMs disk access

Wondering if anyone can help? I have noticed in a couple of Windows Server 2008 R2 Hyper-V scenarios, that the VM guests are often very slow. Disk access is especially slow.
In one situation their was only a couple of guest VMs, and they were running of mirrored IDE HDDs. Performance improved significantly when I used two mirrored SSD hdds instead.
My other main situation is where the VHDs are stored on HP Lefthand P4300, over 2-nodes with 8 SATA hdds in each, using iSCSI.
So I ran a few tests with robocopy copying 4-6GB of files (mostly large) or whole VHDs (40GB or more), using HP4300 SATA, a newer HP 4330 SAS, a THECUS NAS with SATA hdds, and an SSD in a THECUS NAS, and local SAS mirrored hdds. All using iSCSI except
the local SAS hdds.
You can see from results that Guests run considerably slower than host. Any ideas?
Sample data (although not always same background conditions of load etc):
From within Guest direct iSCSI to same (from HP 4330): 34MB/s
From other Guest using VHD (from HP4300) to direct iSCSI (from HP4330): 14MB/s
From within Guest using VHD (from HP4330) to same: 9MB/s
From within Guest using VHD (from HP4300) to VHD (from HP4330): 11MB/s
From within Guest using VHD (from HP4330) to VHD (from HP4330): 19MB/s
From within Guest using VHD (from THECUS SSD) to same VHD (from THECUS SSD): 18MB/s
From within Guest using VHD (from HP4300) to VHD (from THECUS SSD): 13MB/s
From within Host from HP4300 iSCSI to HP4330 iSCSI: 12MB/s
From within Host using VHD (from THECUS SSD) to same VHD (from THECUS SSD): 40MB/s
From within Host from HP4330 iSCSI to same HP4330 iSCSI: 232MB/s & 132MB/s
From within Host from HP4330 iSCSI to HP4300 iSCSI: 40MB/s & 57MB/s
From within Host from HP4300 iSCSI to same HP4300 iSCSI: 26MB/s & 47MB/s
From within Host from HP4300 iSCSI to Guest VHD (from THECUS SATA): 15MB/s

Hi aucj,
I would suggest to use host level ISCSI connection then build VM on that ISCSI disk .
please add more Vcpu for that VM then try to copy again (shutdown the other VMs ,in that online VM from one folder to another folder ).
Hp4330 ISCSI connection is 1GB , right ?
If yes , it should be with max 100M/s with the single ISCSI connection .
Best Regards
Elton Ji
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

Hyper-V Guest Disk Configuration and SAN placement

In a nutshell, I have a test 2012 R2 cluster (2-node) attached by fibre to a SAN. The SAN at present is configured with 2 volumes, one RAID 10 and the other RAID 5.
2 questions really. Is it best practice for each guest to have 2 virtual hard disks, one for OS and the other for data. If so, would it be appropriate to put the OS vhdx on the RAID 10 and the data on RAID 5?
I'm trying to get a general rule of thumb rather than cater for say specifics such as SQL server. I'm really looking at file servers and the like initially.
Ian

Hi Ian, I have a similar setup in production, I have 5 CSV volumes, 2 of them are using SATA disks, and 3 are high performance SAS, based on an EMC VNX. I have classed these storage volume as Gold and Bronze.
we have some guests that are files servers, so the OS is on the fast disk, and the data is on the slower SATA disk.
I used SCVMM to Storage migrate and split the VHDX files up across CSV volumes.
I did see this in an article on Hyper-V and its a fully supported practice. I think it more down to requirements rather than best practice. and making use of any slower disk you have rather than wasting the high performance on applications that don't require
it.
Hope that helps
Cheers
Mark

Error "NOTICE: [0] disk access failed" during guest domain network booting

Hi,
Could you please tell me what is the problem with my configuration?
I created guest domain on my T1000 server.
As a disk I used disk from disk array: /dev/dsk/c0t18d0
I added disk using commands:
# ldm add-vdsdev /dev/dsk/c0t18d0 vol1@primary-vds0
# ldm add-vdisk vdisk1 vol1@primary-vds0 myldom1
# ldm set-variable auto-boot\?=false myldom1
# ldm set-variable boot-device=/virtual-devices@100/channel-devices@200/disk@0 myldom1
Then I logged to guest domain and booted from network to install OS from JumpStart server:
{0} ok boot net - install
Boot device: /virtual-devices@100/channel-devices@200/network@0 File and args: - install
Requesting Internet Address for 0:14:4f:f9:78:19
SunOS Release 5.10 Version Generic_137137-09 64-bit
Copyright 1983-2008 Sun Microsystems, Inc. All rights reserved.
Use is subject to license terms.
Configuring devices.
NOTICE: [0] disk access failed.
Checking rules.ok file...
Using begin script: install_begin
Using finish script: patch_finish
Executing SolStart preinstall phase...
Executing begin script "install_begin"...
Begin script install_begin execution completed.
ERROR: No disks found
- Check to make sure disks are cabled and powered up
Solaris installation program exited.
Configuration:
[root@gt1000a /]# ldm list-bindings
NAME STATE FLAGS CONS VCPU MEMORY UTIL UPTIME
primary active -n-cv- SP 4 2G 0.5% 2h 23m
MAC
00:14:4f:9f:71:4e
HOSTID
0x849f714e
VCPU
VID PID UTIL STRAND
0 0 5.3% 100%
1 1 0.5% 100%
2 2 0.5% 100%
3 3 0.4% 100%
MAU
ID CPUSET
0 (0, 1, 2, 3)
MEMORY
RA PA SIZE
0x8000000 0x8000000 2G
VARIABLES
keyboard-layout=US-English
IO
DEVICE PSEUDONYM OPTIONS
pci@780 bus_a
pci@7c0 bus_b
VCC
NAME PORT-RANGE
primary-vcc0 5000-5100
CLIENT PORT
myldom1@primary-vcc0 5000
VSW
NAME MAC NET-DEV DEVICE DEFAULT-VLAN-ID PVID VID MODE
primary-vsw0 00:14:4f:fa:ca:94 bge0 switch@0 1 1
PEER MAC PVID VID
vnet0@myldom1 00:14:4f:f9:78:19 1
VDS
NAME VOLUME OPTIONS MPGROUP DEVICE
primary-vds0 vol1 /dev/dsk/c0t18d0
CLIENT VOLUME
vdisk1@myldom1 vol1
VCONS
NAME SERVICE PORT
SP
NAME STATE FLAGS CONS VCPU MEMORY UTIL UPTIME
myldom1 active -n---- 5000 12 2G 0.1% 2h 18m
MAC
00:14:4f:f9:e7:ae
HOSTID
0x84f9e7ae
VCPU
VID PID UTIL STRAND
0 4 0.5% 100%
1 5 0.0% 100%
2 6 0.0% 100%
3 7 0.0% 100%
4 8 0.0% 100%
5 9 0.0% 100%
6 10 0.0% 100%
7 11 0.0% 100%
8 12 0.0% 100%
9 13 0.0% 100%
10 14 0.0% 100%
11 15 0.0% 100%
MEMORY
RA PA SIZE
0x8000000 0x88000000 2G
VARIABLES
auto-boot?=false
boot-device=/virtual-devices@100/channel-devices@200/disk@0
NETWORK
NAME SERVICE DEVICE MAC MODE PVID VID
vnet0 primary-vsw0@primary network@0 00:14:4f:f9:78:19 1
PEER MAC MODE PVID VID
primary-vsw0@primary 00:14:4f:fa:ca:94 1
DISK
NAME VOLUME TOUT DEVICE SERVER MPGROUP
vdisk1 vol1@primary-vds0 disk@0 primary
VCONS
NAME SERVICE PORT
myldom1 primary-vcc0@primary 5000
[root@gt1000a /]#
Kind regards,
Daniel

Issue solved.
There was a wrong disk name:
primary-vds0 vol1 /dev/dsk/c0t18d0
I changed to c0t18d0s2 and now I sucessfuly installed OS from Jumpstart.

USB Disk access "Extremely" Slow

I am unable to use my network disk essentially because the disk access write/read times are SO SLOW...I am better off running backups by connecting my disk directly to the compter. Does anyone else have this problem?
It took 5 Minutes to read my Music directory; connected directly via the same cable it takes seconds.
What gives?
Any help would be appreciated.

I got my AE and Seagate FreeAgent Pro hard drive
yesturday and I have the exact same problem.
If I hook up the drive to the computer directly it is
very very fast.
If I hook it up to the AE it takes about 2 hours to
move a couple fils totaling 2 gigs over ETHERNET!
If I transfer the same files over the same network
between 2 computers the speed is much much faster.
Is this normal or some nasty firmware bug. It almost
feels like the AE is using USB 1.0 for some reason.
You guys are funny. How about checking out the specs of USB 2.0 and 802.11g/n?
Go here:
http://en.wikipedia.org/wiki/802.11g#802.11g
and here:
http://en.wikipedia.org/wiki/USB_2.0
Firewire vs. USB tests are here:
http://www.g4tv.com/techtvvault/features/39129/USB20_Versus_FireWirepg3.html
802.11g:
Release Date Op. Frequency Data Rate (Typ) Data Rate (Max) Range (Indoor)
June 2003 2.4 GHz 19 Mbit/s 54 Mbit/s ~35 meters
802.11n:
Release Date Op. Frequency Data Rate (Typ) Data Rate (Max) Range (Indoor)
Mid 2008 5 GHz and/or 2.4 GHz 74 Mbit/s 248 Mbit/s (2 stream) ~70 meters
Bottom line: 802.11n typical is 74Mbps, 802.11g typical is 19Mbps. USB 2.0 typical is 50Mbps.
On the average, you should expect your speed to drop by over 50% when connecting the USB drive to AESB using an 802.11g device. If your device is 802.11n, then you should have pretty much similar performance.
Now, if you increase the distance from your base station, or you put walls in between, the performance of 802.11g will go down "dramatically", all the way to 2-3Mbps, easy. Not so for 802.11n, which behaves much better at longer distances.

Hyper V guest slow disk access

Similar Messages

Maybe you are looking for