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Home » Disks and Volumes

Solaris 10 SVM/SDS Mirrored Root Disk Replacement

Submitted by on September 25, 2012 – 3:08 pm 8 Comments

The following is a standard process for replacing a failed boot disk mirrored with SVM on a Solaris 10 Sun server. Your hardware must support hot-swappable disks for this process to be performed without booting into single-user mode.

Environment:

Sun Fire V240
SunOS Release 5.10
UltraSPARC-IIIi

The following two root disks are mirrored with SVM:

c0t0d0 (sd3) Fujitsu MAT3073N SUN72G SCSI Disk Drive
c0t1d0 (sd0) Fujitsu MAT3073N SUN72G SCSI Disk Drive

Scenario:

c0t1d0 has failed and needs to be replaced

1) Identifying the failed disk

Failed disk can be identified as the one in “maint” state:

Additionally, the failed disk will show the “W” (“Write” error) state in metadb:

Take extra care when identifying the failed disk and the corresponding MD devices. A scripted solution, similar to the one below, may help avoid manual mistakes.

Output:

2) The next step is to detach and clear the MD devices:

Note: depending on the size of the partitions, the “metaclear” operation may take some time. To automate things a bit, use a simple loop as shown below. Don’t forget to substitute the correct name for the meta devices on your system:

Sample output:

 

3) Delete metadat for the failed disk. The first command may take a while, so don’t panic.

Sample output:

4) Run cfgadm and verify the status of the failed disk

Output:

5) Remove the disk

Run cfgadm again and verify that the failed disk is not showing up. The second time you run the cfgadm command, it will take a minute to re-scan your disks, so be patient.

6) Physically replace the failed disk. I guess I don’t need to remind you about the importance of unplugging the correct drive.

Note: if you run into an error below when executing “cfgadm -c configure”, try re-running the same command a minute later and see if it works this time. The reasoin for this failure is that it takes the system some time to rescan SCSI paths and detect new devices. It may take a while for cfgadm to configure a large disk, so find something to do…

7) Run “format” and verify disk information. Then run “prtvtoc” to format the replacement disk to look like the good mirror disk. The “prtvtoc” may take a long time

Note: there is a chance that “prtvtoc” may give you an error along the lines of “/dev/rdsk/c0t1d0s2: Cannot get disk geometry”. What to do: run “format”; select the disk you just replaced (in this example it appeared as “c0t1d0 <drive not available>”; from the list of “Available Drive Types”, select your drive type (or “Auto configure”, if you don’t see the correct drive type in the list); type “current” to verify you are working with the correct disk; type “format”. If you are still getting an error saying “Format failed”, then it is likely that your replacement disk is defective. It happens more often than you’d think…

8) Run “/usr/sbin/metastat -ac” a few times until you confirm the new disk is synced up with the good mirror.

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8 Comments »

  • Jack Bauer says:

    My lap top has two hard disk drives. One of them is nearly full. How do I switch to the other one so my computer will stop telling me to delete data that I still want?

  • mendhak says:

    My laptop shows a blue screen message, saying that the HDD has failed. What has failed; the actual disk, the disk drive of both? Can the disk be removed from the drive and read?

  • DuckieM10 says:

    I’m trying to install a new operating system on to my computer but, they won’t install because its having a hard time copying files to the hard disk.
    I have tried to install Windows 7 Ultimate, Mint (linux) and Ubuntu 9.10, but none of them will install correctly.
    Do I just need to buy a new computer or is there a way to fix this?

  • morbiusdog says:

    While playing Dead Rising, my game keeps going into a “sluggish” state for up to 25-30 secs, then it resumes to normal speed. It keeps lagging like that over and over, and there’s nothing wrong with the disk. Is this an early sign of my disk reader failing?

  • andresumoza says:

    I did not create recovery discs with my HP Windows Vista Home Premium computer.
    Is there a website I could securely download these files and create the discs? Or another way I could delete every file and restore my system to the point where it’s like I just bought it?

  • mr flibble says:

    My brother and I were just having an argument about how the length of the friction zone of a clutch varies when the clutch is starting to wear/failing. If a clutch is failing, would the friction zone become longer or shorter? He says it would become longer because the clutch plates would need to make more contact in order to compensate for the decreased friction between the plates. To me, that just doesn’t sound right. Anyone care to chime in?

  • tjpimpin says:

    S.M.A.R.T has informed me that my laptop hard disk is doomed to failure and will lose all its data unless I find a replacement. How much would it cost to get a new one? My current hard drive has 189 GB but I’d like something with a lot more space, and preferably cheap…

  • liza says:

    The usb ports work well enough with modem and camera. My PC is running on Windows XP Home, which is newly installed. The usb disk works fine in other computers.

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