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Recover Solaris OS when metadb is Corrupted

Netra 210, No Keyboard
Copyright 1998-2003 Sun Microsystems, Inc.  All rights reserved.
OpenBoot X.XX.X, 1024 MB memory installed, Serial #XXXXXXX.
Ethernet address X:X:XX:XX:XX:XX, Host ID: XXXXXX.

ok boot

Cannot mount root on /pseudo/md@0:0,0,blk fstype ufs

panic[cpu0]/thread=140a000: vfs_mountroot: cannot mount root

0000000001409970 genunix:vfs_mountroot+70 (0, 0, 0, 200, 14581f0, 0)
%l0-3: 000000000144bc00 000000000144bc00 0000000000002000 00000000014957a8
%l4-7: 000000000149b400 0000000001411e58 000000000144c400 000000000144f400
0000000001409a20 genunix:main+90 (1409ba0, f0059684, 1409ec0, 39c65f, 2000, 500)
%l0-3: 0000000000000001 000000000140a000 0000000001412fc8 0000000000000000
%l4-7: 0000000078002000 000000000039e000 00000000014a3c28 0000000001066fb8

skipping system dump – no dump device configured
rebooting…

SC Alert: Host System has Reset

SC Alert: CRITICAL ALARM is set

SC Alert: Failed to send email alert for recent event.

1. First,  go to ok prompt.

#init 0 –> in OS
sc> break -y  –> in ALOM

2. At the ok prompt, boot the CD-ROM.

ok boot cdrom -s

3. After booting, mount the root slice:

# mount /dev/dsk/c1t1d0s0 /a

4. Edit /a/etc/system file to delete everything between:

Begin MDD root info (Do not edit this line.)

End MDD root info (Do not edit this line.)

5. Edit /a/etc/vfstab file to replace all the /dev/md/dsk entries to /dev/dsk.

#device         device          mount           FS      fsck    mount   mount
#to mount       to fsck         point           type    pass    at boot options
#
fd      -       /dev/fd fd      -       no      -
/proc   -       /proc   proc    -       no      -
/dev/md/dsk/d1  -       -       swap    -       no      -
/dev/md/dsk/d0  /dev/md/rdsk/d0 /       ufs     1       no      -
/dev/md/dsk/d5  /dev/md/rdsk/d5 /opt   ufs     2       yes     -
/dev/md/dsk/d4  /dev/md/rdsk/d4 /var    ufs     1       no      -
/dev/md/dsk/d7  /dev/md/rdsk/d7 /data1 ufs     2       yes     -
/dev/md/dsk/d6  /dev/md/rdsk/d6 /data   ufs     2       yes     -
swap    -       /tmp    tmpfs   -       yes     -

to

#device         device          mount           FS      fsck    mount   mount
#to mount       to fsck         point           type    pass    at boot options
#
fd      -       /dev/fd fd      -       no      -
/proc   -       /proc   proc    -       no      -
/dev/dsk/c1t1d0s1       -       -       swap    -       no      -
/dev/dsk/c1t1d0s0       /dev/rdsk/c1t1d0s0      /       ufs     1       no      -
/dev/dsk/c1t1d0s5       /dev/rdsk/c1t1d0s5      /opt   ufs     2       yes     -
/dev/dsk/c1t1d0s4       /dev/rdsk/c1t1d0s4      /var    ufs     1       no      -
/dev/dsk/c1t1d0s7       /dev/rdsk/c1t1d0s7      /data1 ufs     2       yes     -
/dev/dsk/c1t1d0s6       /dev/rdsk/c1t1d0s6      /data   ufs     2       yes     -
swap    -       /tmp    tmpfs   -       yes     -

Note:
Please be careful when editing the /etc/vfstab, if you forgot the device to mount, check either below file:
/kernel/drv/md.conf
/etc/lvm/mddb.cf
/etc/lvm/md.cf

7. Then try to boot the disk.

Note:
Make sure to backup /etc/system, /etc/vfstab, /etc/lvm/md.cf,/etc/lvm/mddb.cf, /kernel/drv/md.conf before edit.
Example: cp /etc/system /a/etc/system.original

Related posts:

1. Enable FTP in Solaris 10

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By AskNadya