How to identify physical drives in software RAID?

I've got 6 G-Tech 2TB drives in a RAID 10 configration hanging off of an older Mac Mini. A couple of the slices have started to act up leading me to believe one day soon I might need to replace a drive in the event the automatic rebuild fails. The trouble is I do not know how to associate the slice name (disk'n's2) with the actual physical device. Any ideas on how to do this?

How are they connected & what OSX version?
If SATA, in System Profiler>More Info>Hardware>Serial-ATA, once I highlight the manufactures name it shows the Serial#, at least in 10.5.8

Similar Messages

How to identify which drive is the current boot drive?

I have a PowerBook running Leopard, and I prefer to boot from the external drive. It's bigger and has my working files. The current internal drive is for future use, for when I have a replacement machine. I know how to specify the boot drive in Preferences, but sometimes the machine reboots without me. I don't know how to verify which drive I'm booted from. I changed the desktop background, so that once I'm logged in I can tell, but surely there is a more direct way to determine this. Isn't there?

A simple option would be to select About this Mac from the Apple menu.

How to determine physical drive mapping?

Hi,
after selecting a file using the FileChooser dialog, i would like to convert the file path like "H:\index.htm" into a form like "\\filer01\dir\index.htm", where \\filer01\dir corresponds to the physical drive mapping.
On my system, the logical device name H:\ is mapped to a directory on a file server "filer01".
Is there any possibility to do this conversion by getting the physical drive mapping from the systems environment?
Thanks in advance.

I've got a book called Visual Basic Programmer's Guide to the Win32 API, by Dan Appleman, where I look up things like that. But it's all available online on MSDN.

How to Identify Physical External Hard Drives that Show in Finder?

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Thanks.

"... and add FW800 controller" was in there for you, for now.
I consider that the best answer to daisy-chaining along with the problems that arise such as yours and others trying to do the same.

How to download scanner driver without Software Update Lion

I checked on the printer and scanner page that Lion supports my old Epson Perfection 2450 scanner
http://support.apple.com/kb/HT3669#epson
Lion cannot seem to recognize my scanner, I have tried everything...
Is there a way to redownload the driver but not through Software Update? There seems to be no update for Epson driver after installing Lion.

I know you tried everything, but did that include using Preview?
In Preview, use File > Import from Scanner.
The same ability is available in System Preferences > Print & Scan.
If that does not work, use Image Capture in the Applications folder.
Beginning with Lion, Software Update is supposed to incorporate all drivers. There should be no need to install them any other way, nor am I aware of any other method.
If you haven't already, read Epson's support site for Lion: http://www.epson.com/cgi-bin/Store/support/supportLion.jsp

How to add another drive to striped RAID

I have 2 1TB drives in a striped RAID. Now I would like to add a 3rd. Can I just drag it into the RAID array in Disk Utility?

No. A new array will have to be made with all three drives. Since this means removing the old array and making a new one all the data on the old array will be lost, so make a backup first if there's anything you need to save.

How to detect which physical drive a given file is on

Given a file that exists, is there a way within Java to detect what physical drive that file is on? I don't care how that drive is denoted, as long as it is uniquely specified. This can be through a hard drive serial number, or any other way. The specifics of the drive do not matter, I only care about uniquely identifying physical drives. If it matters, I'd like to also be able to determine if said drive is a flash drive, however programmatically I won't care that it is a flash drive, just that it is a separate drive itself.
If this isn't possible through Java, could someone point me in the direction of how to determine this through another language, possibly using JNI?

mgolowka wrote:
Given a file that exists, is there a way within Java to detect what physical drive that file is on?
Check if this helps you, I'm not sure the effects when this is executed in a Unix based environment.
     public static void main(final String[] args) {
          final String fileName = "my_file.myext";
          final File file = new File(fileName);
          final File roots[] = File.listRoots();
          final String rootOfTheFile = file.getAbsolutePath().substring(0,
                    file.getAbsolutePath().indexOf(File.separator))
                    + File.separator;
          System.out.println("File is present in - " + rootOfTheFile);
          for (final File file2 : roots) {
               System.out.println("Root in system - " + file2.getPath());
     }And the output for the code is as follows, of which Y and Z are network mapped drives.
File is present in - D:\
Root in system - C:\
Root in system - D:\
Root in system - E:\
Root in system - F:\
Root in system - Y:\
Root in system - Z:\

How to setup x2 sata W/D Raptor drives not using raid

Hi all,
I am new to this forum so please be kind.
I have just got myself this NE02 board along with 2 W/D Raptor SATA Hard Drives.
I have seem many instructions in these groups about how to configure sata drives using a raid configuration.
What I am looking to do is basically install 2 Raptor SATA drives not using raid,
And also have 2 ide cdrom drives.
Can someone please come back with a nice simple if that can be done! configuration on how i can best achive this.
Many thanks for all your help.
Silent2004

In bios under Integrated Peripherals, On Chip ATA Operating Mode set
Native Mode
ATA Configuration - SATA only
SATA Keep enabled - yes
PATA Keep enabled - yes
PATA channel selection - both
Configure SATA as Raid - no
Read the raid thread at the top anyway, as you may want to install the drivers during the XP install in case you change your mind later.
Also, during your Windows installation, just connect a single SATA drive untill you are up and running.
Read P4 Neo Unofficial Guide for more information.

Software RAID - deconstructing

Hi all -
What I've done on my machine is set up a backup system whereby Silverkeeper backs up my internal 'work' drives to a LaCie 160gb external drive. I then set up a software RAID in Disk Utility (RAID 1), and so the 160gb is backed up by another LaCie 200gb drive right next to it.
The problem is this: the 200gb drive keeps 'failing', and my RAID displays as 'degraded' every few days or so. The only thing that seems to help is restarting the machine, formatting the 200gb, and rebuilding the RAID. I'd really like to swap out the 200gb for another drive, but I'm a bit confused as how to remove the drive from the RAID set and swap in another one. I understand the 200gb drive must have problems, and so replacing it is probably my best option..
Should I be adding the new drive first or should I somehow be removing the 200gb drive from the RAID set and THEN adding a new drive?
There's really not a lot of good documentation on this sort of thing. Any help would be appreciated...
Pete

bump
Dual 2.0 PM G5 Mac OS X (10.4.3)

How to identify/remove kexts labeled as kernel_task that consume too much resources

Hi all,
I am using Mac Os X 10.6, on a 2010 macbook pro 17" with latest updates as of 09 05 2011
I am using memory intensive applications for scientific purposes, and I am quite unhappy with one kernel extension that consumes more than 600 mb of real memory.
It is most probably a driver,
but I do not know how to identify which driver it is, and how to remove it.
does Mac Os provide anything like modprobe modtools etc? Or even anything that resembles windows device driver managment in XP is welcome.
Best,
OBM

Sorry, the activity monitor and top are bit too vague for the problem at hand.
This kernel_task, is a container for all the kernel extensions, right?
It is strange, the amount of memory reported by kextstat does not match with this value,
only if all 147 of them was using 4 mb of memory (as I've told, those are the only 2 6 digit numbers, most of them
are 4 digit numbers, so it is impossible) I would have a figure close to it.
So do you mean there is something I can not see that consumes this memory?
These are the internal kexts which are "internal" and size information is not available, can it be a virus or something?
    1   86 0          0          0          com.apple.kpi.bsd (10.7.0)
    2    4 0          0          0          com.apple.kpi.dsep (10.7.0)
    3 112 0          0          0          com.apple.kpi.iokit (10.7.0)
    4 118 0          0          0          com.apple.kpi.libkern (10.7.0)
    5 101 0          0          0          com.apple.kpi.mach (10.7.0)
    6   33 0          0          0          com.apple.kpi.private (10.7.0)
    7   55 0          0          0          com.apple.kpi.unsupported (10.7.0)
    8    0 0          0          0          com.apple.kernel.6.0 (7.9.9)
    9    0 0          0          0          com.apple.kernel.bsd (7.9.9)
   10    0 0          0          0          com.apple.kernel.iokit (7.9.9)
   11    0 0          0          0          com.apple.kernel.libkern (7.9.9)
   12    0 0          0          0          com.apple.kernel.mach (7.9.9)
For the sake of completeness, this is the output from top:
0-     kernel_task 2.7 05:00:25 77/4 0    2    1667+ 38M+   0B     586M+ 97M+   3113M+ 0     0     running 0    1788588    344    2004230579+ 1935476674+ 0          0           1062169040+

How to restore a software raid mirror after a drive failure

i set up a software raid mirror with two hard drives in a mac pro. then one failed as reported by disk utility. i replaced the drive. it does not seem possible to restore this raid short of copying the files to a third location and then erasing and establishing a new raid. is there a way to simply "restore"?

Question: Do I need special software to administer the Mac Pro RAID Card or the Xserve RAID Card?
Answer: Normal administration can be carried out using the RAID Utility (found in /Application/Utilities) or by using the raidutil command. For more information refer to the User’s Guide or man raidutil.
The command-line utility should be available in Single-User mode.
To run RAID Utility, you may need to boot to an alternate source of Mac OS to be able to manipulate the Boot drive.
This article suggests using the Make Spare command:
RAID Utility 1.0 Help > If a Disk Fails
Message was edited by: Grant Bennet-Alder

Adding A New Drive To A Software RAID 5 Array

Edit 3: Just mounted the partitions and I can delete them because they contain nothing special. Is it safe to expand the 2nd partition of each drive to fill up the left over 22 GB?
Edit 2: I just deleted all the partitions off of my new drive and created one partition, then added it to the array and it works just fine. My next question is, can I delete all the smaller partitions and expand /dev/sd[x]2 to reclaim all the space (about 70 GB)?
One of my drives failed and Western Digital sent me a new drive, except it was an external drive instead of an internal drive, so I cracked it open and the label looked different. Turns out it's just refurbished and it's the same model as my other drives (WD Caviar Green 3 TB).
I've read through the wiki article on Software RAID and created the partitions exactly the same as my other drives, but while creating the main 2.7 TB partition it says that the ending sector is out of range when it isn't. I'm new to all this so I have no idea what to do. From what I've read there normally aren't this many partitions per disk, correct? I also have md124, md125 and md126 for the other partitions. md127 is for the 2.7 TB partitions. I took the array out of my Thecus N4520. I have a 3 TB external drive and a 1TB internal, along with another 500 GB drive. Would I be better off at destroying the RAID set and creating a fresh RAID 5 set, considering I'm losing about 90 GB if I don't need the smaller partitions.
/dev/sdc
Disk /dev/sdc: 5860533168 sectors, 2.7 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 00636413-FB4D-408D-BC7F-EBAF880FBE6D
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 5860533134
Partitions will be aligned on 2048-sector boundaries
Total free space is 43941 sectors (21.5 MiB)
Number Start (sector) End (sector) Size Code Name
1 41945088 46139375 2.0 GiB FD00
2 47187968 5860491263 2.7 TiB FD00 THECUS
3 46139392 47187951 512.0 MiB FD00
4 2048 20973559 10.0 GiB FD00 i686-THECUS
5 20973568 41945071 10.0 GiB FD00
/dev/sdd
Disk /dev/sdd: 5860533168 sectors, 2.7 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): C5900FF4-95A1-44BD-8A36-E1150E4FC458
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 5860533134
Partitions will be aligned on 2048-sector boundaries
Total free space is 43941 sectors (21.5 MiB)
Number Start (sector) End (sector) Size Code Name
1 41945088 46139375 2.0 GiB FD00
2 47187968 5860491263 2.7 TiB FD00 THECUS
3 46139392 47187951 512.0 MiB FD00
4 2048 20973559 10.0 GiB FD00 i686-THECUS
5 20973568 41945071 10.0 GiB FD00
/dev/sde
Disk /dev/sde: 5860533168 sectors, 2.7 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 2B5527AC-9D53-4506-B31F-28736A0435BD
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 5860533134
Partitions will be aligned on 2048-sector boundaries
Total free space is 43941 sectors (21.5 MiB)
Number Start (sector) End (sector) Size Code Name
1 41945088 46139375 2.0 GiB FD00
2 47187968 5860491263 2.7 TiB FD00 THECUS
3 46139392 47187951 512.0 MiB FD00
4 2048 20973559 10.0 GiB FD00 i686-THECUS
5 20973568 41945071 10.0 GiB FD00
new drive: /dev/sdf
Disk /dev/sdf: 5860467633 sectors, 2.7 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 93F9EF48-998D-4EF9-B5B7-936D4D3C7030
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 5860467599
Partitions will be aligned on 2048-sector boundaries
Total free space is 5813281700 sectors (2.7 TiB)
Number Start (sector) End (sector) Size Code Name
1 41945088 46139375 2.0 GiB FD00 Linux RAID
2 47187968 47187969 1024 bytes FD00 Linux RAID
3 46139392 47187951 512.0 MiB FD00 Linux RAID
4 2048 20973559 10.0 GiB FD00 Linux RAID
5 20973568 41945071 10.0 GiB FD00 Linux RAID
when I type in 5860491263 as the end sector gdisk does nothing, just wants more input. If I type +2.7T it accepts it, but really it just creates a partition that's 1KB in size!
I am able to create a 2.7 TB partition with an end sector of 5860467599, this won't screw anything up will it?
Edit 1: just tried it and got this
[root@ra /home/bran]# mdadm --add /dev/md127 /dev/sdf2
mdadm: /dev/sdf2 not large enough to join array
[root@ra /home/bran]# fdisk -l /dev/sdf
Disk /dev/sdf: 2.7 TiB, 3000559428096 bytes, 5860467633 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 93F9EF48-998D-4EF9-B5B7-936D4D3C7030
Device Start End Size Type
/dev/sdf1 41945088 46139375 2G Linux RAID
/dev/sdf2 47187968 5860467599 2.7T Linux RAID
/dev/sdf3 46139392 47187951 512M Linux RAID
/dev/sdf4 2048 20973559 10G Linux RAID
/dev/sdf5 20973568 41945071 10G Linux RAID
Last edited by brando56894 (2014-04-28 00:47:29)

Sorry I numbered them to show the flow of information, this was also just a place for me to store info as I worked through it. I managed to get it to work by creating a partition that takes up the whole drive and is actually 22 GB larger than all the other drives (since I found out that the had root, swap and home partitions that are no longer needed).
I should be able to resize the other partitions without a problem, correct? They're EXT4. Should I unmount the raid array and do them individually, remount the array, let it sync and do the next? Or just unmount the array, resize all of them, mount it and let it sync?

Both drives failed in RAID 1 array. How do I recover from this?

So I have a large problem on my hands; my RAID 1 array has 2 disks which have both failed. One disk failed at a time with a span of about a month between the 2 failures. Since I hear no clicking noises from the disks and I can still see both of them when I do a "diskutil list", I'm guessing the disk electronics are good as well, so I should be able to work with the disks. Here's the output from "diskutil checkRaid" :
Name: USB RAID Set 1
Unique ID: AD191DE5-49CB-4BEE-9362-D98B690DAC3A
Type: Mirror
Status: Offline
Device Node: disk2
Apple RAID Version: 2
# Device Node UUID Status
0 disk1s3 5D09E4DE-E0E9-4518-8672-F247F5CE0CBB Failed
1 disk3s3 431B65E0-DF51-4045-8C1E-CCB69E95916D Failed
Here's what I'd like to do: Although I have a good idea of which of the 2 disks has the most recent data on it, I'd like to be able to mount disk1s3 and disk3s3 independently and compare which has more data on it. Then, I'm going to plug in another USB hard disk and copy the data from the failed raid disk with the greatest disk utilization over to the USB disk I plugged in. At that point I'll trash the RAID 1 array and start over again. Of course I have no backup of my data, so just recovering isn't an option (my genius thinking was, "Ahh who needs backups, I'm using RAID!" Hah.. good one).
I tried doing the following to mount the slices: # diskutil mount disk1s3 and # diskutil mount disk1s3 force. Neither of which mount the disk. I've also tried specifying a mount point and that doesn't work either. All commands come back with "Volume disk1s3 mounted" but if I type "mount", I don't see it mounted anywhere. dmesg and /var/log/system.log don't give me anything useful about why the slices don't mount... the only thing I see from dmesg are the errors which started this mess:
HFS resolvelink: can't find iNode6487433
USBF: 107524. 33 AppleUSBEHCI[0x27c4800]::DoControlTransfer sync request on workloop thread. Use async!
AppleRAID::recover() member 5D09E4DE-E0E9-4518-8672-F247F5CE0CBB from set "USB RAID Set 1" (AD191DE5-49CB-4BEE-9362-D98B690DAC3A) has been marked offline.
AppleRAID::restartSet - restarting set "USB RAID Set 1" (AD191DE5-49CB-4BEE-9362-D98B690DAC3A).
disk2: media is not present.
HFS: err 6 reading VH blk (RAID 1)
jnl: flushing fs disk buffer returned 0x6
disk2: media is not present.
jnl: dojnlio: strategy err 0x6
jnl: writejournalheader: error writing the journal header!
AppleRAID::restartSet - restarting set "USB RAID Set 1" (AD191DE5-49CB-4BEE-9362-D98B690DAC3A).
AppleRAIDSet::addMember() detected expired sequenceNumber (12) for member 5D09E4DE-E0E9-4518-8672-F247F5CE0CBB
Also here's a diskutil list in case that's useful to anyone:
# diskutil list
/dev/disk0
#: type name size identifier
0: Applepartitionscheme *74.5 GB disk0
1: Applepartitionmap 31.5 KB disk0s1
2: Apple_HFS Macintosh HD 74.4 GB disk0s3
/dev/disk1
#: type name size identifier
0: Applepartitionscheme *931.5 GB disk1
1: Applepartitionmap 31.5 KB disk1s1
2: Apple_Boot 128.0 MB disk1s2
3: Apple_RAID 931.4 GB disk1s3
/dev/disk2
#: type name size identifier
0: Apple_HFS *931.4 GB disk2
/dev/disk3
#: type name size identifier
0: Applepartitionscheme *931.5 GB disk3
1: Applepartitionmap 31.5 KB disk3s1
2: Apple_Boot 128.0 MB disk3s2
3: Apple_RAID 931.4 GB disk3s3
/dev/disk4
#: type name size identifier
0: Applepartitionscheme *647.5 MB disk4
1: Applepartitionmap 31.5 KB disk4s1
2: Apple_HFS DiskWarriorCD 647.4 MB disk4s2
So, does anyone know how I can mount the slices independently so that I can grab the data off the useful slice?

Ok figured this one out myself. So the file system types that the FS is labeled with isn't known by the standard mount program, but really under the covers apple's software raid slice is just a HFS partition. Fantastic.
1) So first you figure out what slice you want to mount, in my case /dev/disk1s3 (oh ya, unlike the diskutil command, you need to actually specify the full path to the device so you need the /dev in there)
2) Create a mount point to mount the slice to "mkdir /Volumes/disk1s3" for example
3) Mount it up! "mount -t hfs /dev/disk1s3 /Volumes/disk1s3"
4) If you're interested in actually using the GUI to view the files, you can place an alias on your desktop by doing a "ln -s /Volumes/disk1s3 /Users/<putyour_user_namehere>/Desktop/disk1s3 "
This probably only works for a RAID 1 or maybe even a RAID 1+0 but in any case it allowed me to pull my data off so that I could back the data up and re-create the RAID 1 setup. You should only be doing this if both your drives get marked as failed, otherwise it's way easier to just use the disk utility to repair the array.

Change all the SoftWare RAID partitions to the VLM (physical volume)

My PC has a RHEL5.0 system and other 4 partitions(Software RAID type). Now I want to change all the SoftWare RAID partitions to the VLM (physical volume) partition and I do not want to reinstall the RHEL5.0 system.
How to do it?
Can fdisk tool work? Which tool is easy?

Hans,
I am using ASMLib and no raw partitions. All the
partions must be separated partitions without being
mounted by any system.For the partitions to be used by ASMLib the partition must still be known to the machine.
From the ASMLib pages:
"Every disk that ASMLib is going to be accessing needs to be made available. This is accomplished by creating an ASM disk. The /etc/init.d/oracleasm script is again used for this task: "

Software raid 1 drive(s) failed

Curious on what to do with a RAID 1 Drive (s) failure? I've searched the community and cannot find similar issue/answers.
Configuration:
One 1TB OS & App Drive is fine
Two 3TB RAID 1 Drives for Video scratch are fine
Two 2TB RAID 1 Data Drives are my issue
I'm using the software raid in OSX and it shows "2TB Data Drive/Mirrored Offline"
Both drives have "Failed" next to them
I have backup this Data Drive in Time Machine and a recent full back up to a single drive that is off site. I believe I have a good back up strategy with Time Machine and offsite back ups via Voyager S3. I guess we'll find out!
My question is how do I find out if it's a HW issue or SW issue with this configuration ? And then how to go about recovering them?
Initially when I looked in Disk Utility it appeared that only one of the 2TB drives had "Failed" next to it but now after a reboot "Failed" is next to both drives.
My initial hope was that one of the drives had failed and I'd be able to just replace that drive and the RAID System would rebuild from the other drive.
Any assistance would be appreciated.
Thanks

TommyH wrote:
My initial hope was that one of the drives had failed and I'd be able to just replace that drive and the RAID System would rebuild from the other drive.
RAID 1 just copies the same data to two (or more) drives at the same time, it's only for mission critical data loss requirements where a drive failure during writing would be catastrophic. Like taking purchasing orders or getting a phone call from ET for example.
RAID 0 is dangerous as the data path is separated to how many drives in the RAID 0 set, one drive glitches and all data is lost. But provides insane speeds.
RAID 5 is a much more reliable, it combines many drives (4 or more for more speed) splitting the data path but also has redundancy factor that if a drive dies it can be replaced and the data is recovered from the other drives. Usually a RAID 5 is in a external enclosure with it's own cooling and hardware controllers, not software based RAID where your CPU is being overloaded.
There are other forms of RAID some combinations like RAID 1+0, RAID 6, 10 and so forth, you can find out more about the more eclectic RAID types online.
RAID 5 is more ideally suited to video requirements for data storage, with perhaps a RAID 0 as a scratch disk or a RAID 0 + 1 (the RAID 0 is mirrored to another RAID 0) if your going to take a while working on it that increases the potential of failure.
Once the work is completed, it's sent to the RAID 5 where it's safe with it's redundancy and speed.
http://eshop.macsales.com/shop/hard-drives/RAID/Desktop
The thing to remmeber with the failed RAID 1 Data drive is the data is still on the drive, even though it failed and perhaps things are messed up a little on it on the directory. All the drive needs is to be told it's not part of a RAID 1 anymore, that it's a normal drive, a simple fix, but I don't know how to go about it.
You have two drives and two chances to recover the data off off, simply disconnect one data drive and reboot, see if it will mount and or you can repair the drive in Disk Utility.
If not pull one drive out and stick another blank one in there and download Data Rescue and simply recover the files to the new blank drive. DR works by simply reading the files themselve, not the file struture or anything else.
Software RAID is unreliable, it depends upon the CPU. Opt to get a external RAID where it's based in hardware instead. Use eSATA if all possible.
Also consider using backup software, like Carbon Copy Cloner which can be scheduled to make a backup of your data during the middle of the night. This way if something happens to either your boot drive or a data drive, the clone won't immediately copy the issue to the other drive like a RAID 1 does.
Also Carbon Copy Cloner makes "hold option" bootable OS X boot drive clones, which TimeMachine doesn't.
Also TM kicks in what, like once a hour? It's likely what caused your issue, CCC will work when you schedule it. TM is for consumers, not video pro's like yourself.
If you need even heavier iron as a external RAID setup and more expertise, then see these guys
http://www.macgurus.com/

How to identify physical drives in software RAID?

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