How do I replace a "good" RAID 1+0 disk? Post: 302773627

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Operating Systems Solaris How do I replace a "good" RAID 1+0 disk? Post 302773627 by Twirlip on Thursday 28th of February 2013 11:10:59 AM

02-28-2013

Registered User

How do I replace a "good" RAID 1+0 disk?

Hi,

I have a Solaris Volume Manager (aka Disksuite) RAID 1+0 device consisting of 12 devices. One of these is failing (it has logged several mechanical positioning errors), and I have a replacement disk.

Normally, when a disk fails, volume manager marks it as failed, and replacing it is fairly easy. I would just unconfigure the disk (cfgadm -c unconfigure), replace it, reconfigure the disk, run devfsadm, partition the disk, and then use metareplace to replace it in volume manager.

However, in this case the disk has not actually failed, and is still being written to. How do I tell volume manager to stop using the disk? The only commands I know (metadetatch and metaoffline) will disable the whole d91 submirror (AFAIK), not just this device.

Here is the metadevice in question:

Code:

# metastat d90
d90: Mirror
    Submirror 0: d91
      State: Okay
    Submirror 1: d92
      State: Okay
    Pass: 1
    Read option: roundrobin (default)
    Write option: parallel (default)
    Size: 426673521 blocks (203 GB)

d91: Submirror of d90
    State: Okay
    Size: 426673521 blocks (203 GB)
    Stripe 0: (interlace: 32 blocks)
        Device      Start Block  Dbase        State Reloc Hot Spare
        c4t8d0s0           0     No            Okay   Yes <==== This disk is failing
        c4t9d0s0        2889     No            Okay   Yes
        c4t10d0s0       2889     No            Okay   Yes
        c4t11d0s0       2889     No            Okay   Yes
        c4t12d0s0       2889     No            Okay   Yes
        c4t13d0s0       2889     No            Okay   Yes

d92: Submirror of d90
    State: Okay
    Size: 426673521 blocks (203 GB)
    Stripe 0: (interlace: 32 blocks)
        Device      Start Block  Dbase        State Reloc Hot Spare
        c5t8d0s0           0     No            Okay   Yes
        c5t9d0s0        2889     No            Okay   Yes
        c5t10d0s0       2889     No            Okay   Yes
        c5t11d0s0       2889     No            Okay   Yes
        c5t12d0s0       2889     No            Okay   Yes
        c5t13d0s0       2889     No            Okay   Yes

So, how do I replace c4t8d0s0, but still continue using all the other disks during the replacement? I want to use the same slot, so I have to pull the old disk out first.

(Note: Solaris Volume Manager makes this look like a RAID 0+1, but my understanding is this is really a RAID 1+0 as explained here)

Twirlip

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vxr5check

vxr5check(1M)															     vxr5check(1M)

NAME

       vxr5check - verify RAID-5 volume parity

SYNOPSIS

       /etc/vx/bin/vxr5check [-i | -v] [-g diskgroup] volume

DESCRIPTION

       The vxr5check utility compares the parity of each stripe of a RAID-5 volume specified by volume.  vxr5check reads the data for each stripe,
       generates the parity for this stripe, and compares this parity with the existing parity.

       vxr5check can be run against the entire RAID-5 volume, or incrementally on RAID-5 stripe boundaries, by specifying the -i option.

OPTIONS

       -g diskgroup
		 Specifies the Veritas Volume Manager (VxVM) disk group name for the RAID-5 volume name for verification.  If this option  is  not
		 specified, the default disk group is determined using the rules given in the vxdg(1M) manual page.

       -i	 Verifies the RAID-5 volume incrementally per stripes.	If a parity mismatch is found, that stripe location is displayed.

       -v	 Verbose output for the incremental vxr5check verification.  The verbose option outputs each stripe number that is being verified.

OUTPUT FORMAT

       In  verbose  mode and incremental mode, summary reports for each stripe of the RAID-5 volume are printed in output records.  If an error is
       returned for a stripe, then an error message and stripe number are displayed.  In non-verbose mode, if an error is returned, an error  mes-
       sage is displayed.

       If a parity mismatch error is determined on a stripe, vxr5check exits on that stripe and does not continue for the remaining stripes in the
       RAID-5 volume.

FILES

       /usr/lib/vxvm/bin/vxr5vrfy    The utility that vxr5check calls to perform RAID-5 parity verification operations for  the  specified  RAID-5
				     volume.

EXIT CODES

       The  vxr5check  utility exits with a non-zero status if the attempted operation fails.  A non-zero exit code is not a complete indicator of
       the problems encountered, but rather denotes the first condition that prevented further execution of the utility.

       See vxintro(1M) for a list of standard exit codes.

NOTES

       Do not run vxr5check on a volume that is in degraded mode.

SEE ALSO

       vxevac(1M), vxintro(1M), vxmend(1M), vxvol(1M)

VxVM 5.0.31.1							    24 Mar 2008 						     vxr5check(1M)