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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LEARN ABOUT SUNOS

raidctl

raidctl(1M)						  System Administration Commands					       raidctl(1M)

NAME

       raidctl - RAID hardware utility

SYNOPSIS

       raidctl -c disk1 disk2

       raidctl -d disk1

       raidctl [-f] -F filename controller...

       raidctl -l [controller...]

DESCRIPTION

       The  raidctl  utility  creates, deletes, or displays RAID volumes of the LSI1030 HW Raid controllers that include RAID support. The utility
       also updates firmware/fcode/BIOS for both RAID and non-RAID controllers.

       The raidctl utility requires privileges that are controlled by the underlying file-system permissions. Only privileged users can manipulate
       the RAID system configuration. If a non-privileged user attempts to create or delete a RAID volume, the command fails with EPERM.

       Without options, raidctl displays the current RAID configuration on all exisiting controllers.

OPTIONS

       The following options are supported:

       -c disk1 disk2 (for on board)

	   Create  a  mirror using disk1 and disk2. Replace the contents of disk2 with the contents of disk1. Specify disk1 and disk2 in canonical
	   form, for example, c0t0d0.

	   When you create a a RAID volume, the RAID volume assumes the identity of the first target in the disk pair (disk1). The  second  target
	   (disk2) disappears from the system. Therefore, the RAID volume appears as one disk.

	   To  have  a successful RAID creation, there must not already be a RAID configuration present on the specified controller. Additionally,
	   the secondary disk must not be mounted, as it has all its data erased and replaced with the primary disk's data.

       -d disk1 (for on board)

	   Delete the RAID volume specified as disk1.

	   Specify disk1 in canonical form, for example, c0t0d0.

       -f (for HBA)

	   Force an update. Do not prompt.

       -F filename controller (for HBA)

	   Update the firmware running on the specified controller (controller).

       -l [controller ...] (for on board)

	   List the system's RAID configuration. If controller is specified, list RAID configurations for controller.

	   Output from the -l lists the following information:

	   RAID Volume	   Displays logical RAID volume name.

	   RAID Status	   Displays RAID status as either RESYNCING (disks are syncing), DEGRADED RAID is operating with  reduced  functionality),
			   OK (operating optimally), or FAILED (non-functional).

	   RAID Disk	   Displays RAID disk name.

	   Disk Status	   Displays disk status as either OK or FAILED.

EXAMPLES

       Example 1: Creating the RAID Configuration

       The following command creates the RAID configuration:

       # raidctl -c c0t0d0 c0t1d0
       RAID Volume 'c0t0d0' created

       Example 2: Displaying the RAID Configuration

       The following command displays the RAID configuration:

       # raidctl
       RAID	 RAID	   RAID      Disk
       Volume	 Status    Disk      Status
       ----------------------------------------
       c0t0d0	 RESYNCING c0t0d0    OK
			   c0t1d0    OK

       Example 3: Deleting the RAID Configuration

       The following command deletes the RAID configuration:

       # raidctl -d c0t0d0
       RAID Volume 'c0t0d0' deleted

       Example 4: Updating Flash Images on the Controller

       The following command updates flash images on the controller:

       # raidctl -F lsi1030.fw 0
       Update flash image on controller 0? (y/N): y
       Flash updated successfully

EXIT STATUS

       The following exit values are returned:

       0	Successful completion.

       1	Invalid command line input.

       2	Request operation failed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

       System Administration Guide: Basic Administration

SunOS 5.10							    17 Aug 2004 						       raidctl(1M)