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Bad disk, how to replace ?

 
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Old 06-12-2018
Bad disk, how to replace ?
Hello,

I see hard and transport errors on all disks under treso pool and looks like some data corruption too. I want to take backup before, I reboot and replace disk. As of now, there are no slots free on server, so one option is, to break mirror, remove second disk (I need two disks, because data is 400GB). I have two spare disks, will insert in those slots, mount and copy data.
Can somebody help me to understand, if below setup shows me that I can detach disks without disturbing data and mount ?
Code:
pool: treso
 state: DEGRADED
status: One or more devices has experienced an error resulting in data
        corruption.  Applications may be affected.
action: Restore the file in question if possible.  Otherwise restore the
        entire pool from backup.
   see: http://www.sun.com/msg/ZFS-8000-8A
 scrub: resilver completed after 0h42m with 0 errors on Thu Mar 24 12:11:13 2016
config:

        NAME        STATE     READ WRITE CKSUM
        zones2      DEGRADED    17     0     0
          raidz1    DEGRADED    17     0     0
            c1t4d0  ONLINE       0     0     0
            c1t5d0  DEGRADED    35     0     0  too many errors
            c1t6d0  ONLINE       0     0     0
            c1t8d0  FAULTED      2     0     0  too many errors

errors: 4 data errors, use '-v' for a list
#

Thanks
 
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LEARN ABOUT OSF1

volreattach

volreattach(8)						      System Manager's Manual						    volreattach(8)

NAME

       volreattach - Reattaches disk drives that have once again become accessible

SYNOPSIS

       /usr/sbin/volreattach [-rb] [accessname...]

       /usr/sbin/volreattach -c  accessname

OPTIONS

       The  volreattach  utility  has the following options: Calls the volrecover utility to attempt to recover stale plexes of any volumes on the
       failed disk.  Performs the reattach operation in the background.  Checks whether a reattach is possible. No operation is performed, but the
       name of the disk group and disk media name at which the disk can be reattached is displayed.

DESCRIPTION

       The volreattach utility attempts to reattach disks using the same disk group and media names they had before detachment.

       This  operation	may  be  necessary  if a disk has a transient failure, or if some disk drivers are unloaded or unloadable when the Logical
       Storage Manager is started, causing disks to enter the failed state.

       If the problem is fixed, the volreattach command can be used to reattach the disks without plexes being flagged as stale, as  long  as  the
       reattach happens before any volumes on the disk are started.

       The volreattach command is called from the voldiskadm menus as part of disk recovery.

       The  volreattach  utility tries to find a disk with a disk group and disk ID matching that of the disk(s) being reattached. If the matching
       disk is found, the reattach operation may still fail if the original cause (or some other cause) for the disk failure still exists.

EXIT CODES

       A zero exit status is returned if it is possible to perform a reattach.	Otherwise, non-zero is returned.

SEE ALSO

       volintro(8), voldiskadm(8), volrecover(8)

																    volreattach(8)