test

Solstice DiskSuite 4.2.1 User's Guide

How to Remove a Trans Metadevice and Retain the Mount Device (Command Line)

This example begins with a trans metadevice, d1, containing a mounted file system, and ends up with the file system mounted on the trans metadevice`s underlying master device, which will be d1. 


# metastat d1
d1: Trans
    State: Okay        
    Size: 5600 blocks
    Master Device: d21
    Logging Device: d0
 
d21: Mirror
    Submirror 0: d20
      State: Okay        
    Submirror 1: d2
      State: Okay        
...
 
d0: Logging device for d1
    State: Okay        
    Size: 5350 blocks
# umount /fs2
# metadetach d1
d1: logging device d0 is detached
# metarename -f -x d1 d21
d1 and d21 have exchanged identities
# metastat d21
d21: Trans
    State: Detached    
    Size: 5600 blocks
    Master Device: d1
 
d1: Mirror
    Submirror 0: d20
      State: Okay        
    Submirror 1: d2
      State: Okay
# metaclear 21
# fsck /dev/md/dsk/d1
** /dev/md/dsk/d1
** Last Mounted on /fs2
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
 
FILE SYSTEM STATE IN SUPERBLOCK IS WRONG; FIX? y
 
3 files, 10 used, 2493 free (13 frags, 310 blocks, 0.5%
fragmentation)
# mount /fs2

The metastat command confirms that the trans metadevice, d1, is in the "Okay" state. The file system is unmounted before detaching the trans metadevice's logging device. The trans metadevice and its mirrored master device are exchanged using the -f (force) flag. Running metastat again confirms that the exchange occurred. The trans metadevice and the logging device (if desired) are cleared, in this case, d21 and d0, respectively. Next, the the fsck command is run on the mirror, d1, and the prompt is answered with a y. After the fsck command is done, the file system is remounted. Note that because the mount device for /fs2 did not change, the /etc/vfstab file does not require editing.