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Full Discussion: How do I replace a "good" RAID 1+0 disk?
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
Old 02-28-2013
Sun 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)
 

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LEARN ABOUT NETBSD

mfi

MFI(4)							   BSD Kernel Interfaces Manual 						    MFI(4)

NAME

     mfi -- LSI Logic & Dell MegaRAID SAS RAID controller

SYNOPSIS

     mfi* at pci? dev ? function ?

DESCRIPTION

     The mfi driver provides support for the MegaRAID SAS family of RAID controllers, including:

	   -   Dell PERC 5/e, PERC 5/i, PERC 6/e, PERC 6/i
	   -   Intel RAID Controller SRCSAS18E, SRCSAS144E
	   -   LSI Logic MegaRAID SAS 8208ELP, MegaRAID SAS 8208XLP, MegaRAID SAS 8300XLP, MegaRAID SAS 8308ELP, MegaRAID SAS 8344ELP, MegaRAID
	       SAS 8408E, MegaRAID SAS 8480E, MegaRAID SAS 8708ELP, MegaRAID SAS 8888ELP, MegaRAID SAS 8880EM2, MegaRAID SAS 9260-8i
	   -   IBM ServeRAID M1015, ServeRAID M5014

     These controllers support RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, RAID 50 and RAID 60 using either SAS or SATA II drives.

     Although the controllers are actual RAID controllers, the driver makes them look just like SCSI controllers.  All RAID configuration is done
     through the controllers' BIOSes.

     mfi supports monitoring of the logical disks in the controller through the bioctl(8) and envstat(8) commands.

EVENTS

     The mfi driver is able to send events to powerd(8) if a logical drive in the controller is not online.  The state-changed event will be sent
     to the /etc/powerd/scripts/sensor_drive script when such condition happens.

SEE ALSO

     intro(4), pci(4), scsi(4), sd(4), bioctl(8), envstat(8), powerd(8)

HISTORY

     The mfi driver first appeared in NetBSD 4.0.

BSD
								  March 22, 2012							       BSD
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