Disk I/O Operations

Hi All,
I am newbe for oracle...
Can any one give clear explanation for "What is ment by Disk I/O Operations" in oracle.
thanks a million

I am newbe for oracle...Fine.
Can any one give clear explanation for "What is ment by Disk I/O Operations" in oracle.You need to get a book!
Basically, there is logical and physical I/O - a "Disk I/O Operation" to me
would imply that data was read off a physical disk, rather than being in
a cache (memory) somewhere (logical I/O).
This is not always an obvious distinction, since different I/O configurations
can lead the database server to "think" that what it "sees" as physical I/O is actually a
logical one in the storage subsystem - but the db server software sitting on
the server may not "know" about different caching levels in a SAN or
whatever system is being used to store the data.
Take a look at Cary Millsap's book, also Christopher Lawson and
Gaja Krishna Vaidyanatha for performance tuning basics which
also explain about I/O both physical and logical.
HTH,
Paul...
When asking database related questions, please give other posters
some clues, like OS (with version), version of Oracle being used and DDL.
Other trivia such as CPU, RAM + Disk configuration might also be useful.
The exact text and/or number of error messages is useful (!= "it didn't work!"). Thanks.
Furthermore, as a courtesy to those who spend time analysing and attempting to help,
please do not top post and do try to trim your replies!

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Hi:
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Cannot get brand new hard drive to work. Disk utility states operation not supported when I try to erase or partition?

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You probably have too new a hard disk. Contact the hard disk manufacturer and ask what jumper setting is needed to drop to 1.5 Gbps SATA speed.
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Hi worriedwoman,
You'll only be able to verify the hard drive when you're booted off the drive. The repair functionality is only available when you're running off the installation disc. When you purchased your computer it came with two discs (an installation disc and an applications disc).
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Hi,
We would like to create a master virtual hard disk and use the same for all other VM's. Can we do that ?
my requirements :
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3) After creating the VM's change the HDD size.
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After creating the VM's ,i will change the system names and activate the windows accordingly.
Will there be any implications ,if we can/will do like this.
Thanks.

Hi Suren424,
I think Using Differencing Disks may cover your needs .
Please refer to following setps:
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For details please refer to follwing link:
http://social.technet.microsoft.com/wiki/contents/articles/1393.hyper-v-virtual-machine-vm-parent-child-configuration-using-differencing-disks.aspx
Hope this helps
Best Regards
Elton Ji
We
are trying to better understand customer views on social support experience, so your participation in this
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Thanks for helping make community forums a great place.

Solved: I cannot manage (bring online, initialize, partition, format, or write to) a VHDX hard drive once it has "Enable Virtual Hard Disk Sharing" enabled.

Hello,
Issue:
On a Virtual Machine with a secondary VHDX attached, I cannot manage (bring online, initialize, partition, format, or write to) the VHDX hard drive once it has "Enable Virtual Hard Disk Sharing (VHD Sharing)" enabled.
Questions:
Should I be able to manage (bring online, initialize, partition, format, and write to) a VHDX hard drive once it has VHD Sharing enabled? If I should be able to manage it, what am I missing?
Topography:
One SuperMicro Cluster In a Box (CIB) with 2012 R2 Data Center on each node. Microsoft Failover Cluster installed and working on each node. The Failover Cluster Servers on each host passes all cluster validation tests. Two Hyper-V 2012 R2 Data Center Virtual
Machine (VM) servers, one on each node. 1 common Cluster Shared Volume (CSV) and 1 Generation 2 Scale-Out File Server (SOFS) shared volume both Resilient File System (REFS) formatted. One 5 Gigabit (Gb) Virtual Hard Drive Type X (VHDX) file on the CSV and/or
SOFS. Integrity bit and read only turned off on VHDX file.
Each of the two Hyper-V VMs have one 127Gb VHDX Generation 2 primary hard drive and 1 VHDX secondary hard drive attached, both on SCSI Controller #1.
Background:
If I start VM1 without the VHD Sharing enabled on the secondary hard drive, I can bring the drive online, initialize, partition, format, and write to the drive.
If I enable VHD Sharing, I can no longer modify the drive in Disk Management in any way. With or without VM2 running.
Both VMs and the CSV and SOFS are on the same host cluster server, or not, no difference…
The VHDX is referenced either by the CSV name C:\ClusterStorage\Volume1\TEST1.VHDX
or a Shared Folder name
\\sharedfolder\folder\Test1.VHDX .
If I start VM1 with VHD Sharing disabled and I format the drive, then shut down and enable VHD Sharing, the drive is offline and requests initialization which fails with an "I/O device error", every other attempt to manage the drive fails with
the same "I/O device error", error.
Events:
VDS fails to write boot code on a disk during clean operation. Error code: 8007045D@02070008
Log Name:      System
Source:        Virtual Disk Service
Date:          3/3/2015 11:39:18 AM
Event ID:      10
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      Server1.Domain.local
Description:
VDS fails to write boot code on a disk during clean operation. Error code: 8007045D@02070008
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
    <Provider Name="Virtual Disk Service" />
    <EventID Qualifiers="49664">10</EventID>
    <Level>2</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2015-03-03T19:39:18.000000000Z" />
    <EventRecordID>27318</EventRecordID>
    <Channel>System</Channel>
    <Computer> Server1.Domain.local </Computer>
    <Security />
</System>
<EventData>
    <Data>8007045D@02070008</Data>
</EventData>
</Event>
AND
Log Name:      System
Source:        disk
Date:          3/3/2015 12:16:42 PM
Event ID:      153
Task Category: None
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      Server1.Domain.local
Description:
The IO operation at logical block address 0x0 for Disk 1 (PDO name: \Device\MPIODisk1) was retried.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
    <Provider Name="disk" />
    <EventID Qualifiers="32772">153</EventID>
    <Level>3</Level>
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    <Keywords>0x80000000000000</Keywords>
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    <Channel>System</Channel>
    <Computer>Server1.Domain.local</Computer>
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</System>
<EventData>
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    <Data>1</Data>
    <Data>\Device\MPIODisk1</Data>
    <Binary>0F01040004002C00000000009900048000000000000000000000000000000000000000000000000000020488</Binary>
</EventData>
</Event>
Thanks again for any help,
Robert

Hi All,
I had to buy a Willy Wonka bar and spend a golden ticket to get an answer to this one.
We found that the default LogicalSectorSizeBytes of a VHDX is 512b. It needs to be 4kb.
The Host drive doesn't seem to matter CSV or SOFS. Below is a way to create a VHDX with the correct LogicalSectorSizeBytes.
In Power Shell, type --> New-VHD -Path C:\ClusterStorage\Volume4\Cluster2DataDisks\Cluster2Disk1.vhdx -SizeBytes 200Gb -PhysicalSectorSizeBytes 4kb -LogicalSectorSizeBytes 4kb
Attach the resulting file to your guest cluster servers and set the Enable Virtual Hard Disk Sharing option on both server. You should now be able to bring the drives on-line and initialize them. They will also add to the guest cluster pool.
Change the size, path and file name above to fit your Cluster Servers configuration.
Thank You
Sachin Kumar Support Engineer | Windows Server Setup Team | Microsoft Enterprise Platform for finding the answer to this one.
Hope this helps others.
Robert

Is there a way to force essbase to use a certain disk?

We run essbase 9.3.1 most bso databases, but also some ASO.
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Our operating system runs on C:\. Essbase is installed on D:\ Our M:\ drive is for data purpose.
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ok ok ok (not ok)
all the answers seems to say that it is NOT posible to force it from start.
You can only correct it afterwards.
We want the essbase admins NOT be able to create a application on a certain path.
All the given answers tell me: let them do it and change it later on.
To bad.
But anyhow thanks for all the replies.

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For those who may have to reformat a new hard disk drive, one may as
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The main consideration, other than product testing, or in feeling all
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Oh well... coffee is cheaper if you get yours from Kona directly.
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Hello,
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Confirm that this is what you have been doing?
Selecting an Operating System During Startup
You can select which operating system to use during startup by holding down the Option key. This displays icons for all available startup disks, and lets you override the default setting for the startup disk in Startup Disk preferences (Mac OS X) or the Boot Camp control panel (Windows) without changing that setting.
To select an operating system during startup:
1 Restart your computer and hold down the Option key until disk icons appear onscreen.
2 Select the startup disk with the operating system you want to use, and then click the arrow beneath the icon.
11
12
Removing Windows from Your Computer
How you remove Windows from your computer depends on whether you installed Windows on a second disk partition or on a single-volume disk.
If you installed Windows on a second disk partition: Using Boot Camp Assistant as described below, remove Windows by deleting the Windows partition and restoring the disk to a single-partition Mac OS X volume.
If your computer has multiple disks and you installed Windows on a disk that has only one partition: Start up in Mac OS X and use Disk Utility, in the Utilities folder, to reformat it as a Mac OS X volume.
To delete Windows and the Windows partition:
1 Start up in Mac OS X.
2 Quit all open applications and log out any other users on your computer.
3 Open Boot Camp Assistant.
4 Select “Remove Windows 7,” and then click Continue.
5 Do one of the following:
Â If your computer has a single internal disk, click Restore.
Â If your computer has multiple internal disks, select the disk with Windows on it, and then select “Restore to a single Mac OS partition” and click Continue.
If yes, we now have to get you to get the MBP to boot and that is relatively easy, provided that you have followed all the right steps.

Is there any version of any operating system (Snow Leopard through Maverick) that will make my 2010 Macbook 7,1 run some-what efficiently again? Instead of just installing Maverick, should I consider re-installing any of the previous op systems?

My 13-inch, Mid-2010 Macbook has declined in performance with every operating system upgrade. Maverick functioned, unlike Yosemite, which I currently have every intention of deleting. Honestly, the last time my mac could run multiple applications at once without slowing to a crawl and then crashing was on Snow Leopard, Lion, or Mountain Lion. Although I'm not quite sure at what point my Mac ran smoothest, but remained compatible with the new applications I've downloaded over the years. I know that it's been too long since I enjoyed using my 2010 Macbook. In fact, I thoroughly enjoy using my 2008 Macbook more, despite it's limited compatibility and obsolete features.
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FIRSTLY, THANK YOU! I appreciate any help you can lend me here. Below is a Etrecheck from today.
Essentially, Google Chrome and ANY other program open will eventually freeze up. I deleted Chrome. Re-downloaded. Completely deleted. Used Safari. Absolutely NO BETTER.
If I'm writing a really long document in a word processor and using a thesaurus or dictionary application in the background.... That will eventually freeze my mac.
So ANY assistance here would be terrific because since Yosemite it's been impossible to tolerate.
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If 2 “major” programs are running at the same time, my Macbook is almost unusable due to lag, crashes, and freezes.
EtreCheck version: 2.1.8 (121)
Report generated March 1, 2015 at 9:19:18 AM EST
Download EtreCheck from http://etresoft.com/etrecheck
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Gatekeeper: ℹ️
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    [loaded]    com.google.keystone.agent.plist [Click for support]
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    [loaded]    com.splashtop.streamer-for-user.plist [Click for support]
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    [loaded]    com.macpaw.CleanMyMac2Helper.trashWatcher.plist [Click for support]
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    618 MB    Active RAM
    601 MB    Inactive RAM
    306 MB    Wired RAM
    1.24 GB    Page-ins
    16 MB    Page-outs
Diagnostics Information: ℹ️
    Feb 28, 2015, 11:10:52 AM    Self test - passed
    Feb 27, 2015, 07:05:00 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/LCCDaemon_2015-02-27-190500_[r edacted].crash

I need to reformat my old computer hard drive, I don't have any disks

how do I reformat my old MAC book 's hard drive, if I don't have the disks for the operative system?

Get Snow Leopard DVD, then boot from DVD to format the drive.
http://store.apple.com/us/search/Snow-Leopard---Mac-OS-X-10.6

Disk Utility doesn't run from installation dvd.....

hi there:)
i ran a scheduled maintenance check using Onyx. It turned out that the disk could not be verified and it had to be fixed by inserting the installation dvd and running 'disk utility'. i inserted the dvd and ran the 'disk utility', however, it quit unexpectedly. the following message came up:
Process: Disk Utility [417]
Path: /Volumes/Mac OS X Install Disc 1/Applications/Utilities/Disk Utility.app/Contents/MacOS/Disk Utility
Identifier: com.apple.DiskUtility
Version: 10.5.8 (198.16)
Build Info: DiskUtility-1981600~17
Code Type: X86 (Native)
Parent Process: launchd [172]
Date/Time: 2008-12-28 12:28:49.499 +0000
OS Version: Mac OS X 10.5.6 (9G55)
Report Version: 6
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0
Dyld Error Message:
Symbol not found: __commpagedsmos
Referenced from: /Volumes/Mac OS X Install Disc 1/Applications/Utilities/Disk Utility.app/Contents/MacOS/Disk Utility
Expected in: /usr/lib/libSystem.B.dylib
i really want to know what to do to save my mac book!
please help
regards,
rik

Rik,
Please reread my first post carefully & make sure you follow its instructions closely. The "Repair Disk" step (not the verify one) should be run while your Mac is started up from the install disk, then the "Repair Permissions" step should be run after you have restarted normally.
Some background info that may be helpful:
Disk Utility (& all such disk utilities) must temporarily "unmount" a disk to affect a repair of its file system (which is what the "Repair Disk" step does). Unmounting a disk makes it unavailable for normal use. The disk containing the operating system that is currently running the computer (the startup disk) cannot be unmounted. This is why the "Repair Disk" button is grayed out if you run Disk Utility with your startup disk as its target.
Repairing permissions does not require unmounting the disk but it does require a healthy file system, which is why the disk repair must precede it. Apple recommends repairing permissions on the start up disk while booted from it, which is why it should be done after restarting normally.
The verify steps do not actually repair anything. They just run the checks that the repair steps run to determine if any repairs are needed & report the results of those checks.
The routine that repairs permissions is part of the OS itself. Disk Utility, Onyx, & all other such utilities that repair permissions actually just tell the OS to perform this routine. Thus, it doesn't matter which one you use to do this repair, nor is one utility any better than another at doing this. So if you prefer, after restarting after doing the disk repair from the install disk you can do the permissions repair with Onyx.

Upgrading T430 preloaded with Windows 7 Pro to Windows 8 With Recovery Disks

I just got 19 T430 laptops that we thought would have Windows 8 on them but them came with a preload of Windows 7 Pro and recovery disks for Windows 8. The recovery disks have instructions for using them to upgrade to 8, but the laptop won't boot to the cd/dvd drive. I'm not sure if there is a problem with the instructions or if the disks aren't bootable. I can see them and their contents through Windows Explorer, so I know the drive works.

If it is like the other sets I have seen, there will be 2 "applications and drivers" disk and one operating system disk. You boot from the first "applications and drivers" disk. It will boot, and then call for the other disks when needed. If I remember right, the order is App 1, OS, App1, App2. I suggest backing up your win7 image before installing win8. I used windows 8 just long enough to figure out that I hate it.

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