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Formating a bad jfslog by MoshiachNow
Posted: 7 Feb 02 (Edited 2 Jun 05)

    Format jfslog.

If the jfslog has been damaged for any reason, it will cause the filesystems to not be mounted.
Assume the filesystem /dataVolumes/proof7.2.0 fails to mount and fsck does not help.
Find out the name of the jfslog that belongs to this filesystem:

#  lsvg -l svg2

slv2.0    jfs         1080  1080  2    open/syncd    /dataVolumes/proof7.2.0
loglv02   jfslog  1     1     1    open/syncd    N/A

we will reformat the jfslog. Enter:

1.all filesystems associated with the jfslog *must* be unmounted prior to running logform !

2. logform  /dev/loglv02

This command will ask the horrible question "Do you wish to destroy the log?". Just say yes.  This will get you a new, clean jfslog.
Then we'll run fsck on this filesystem to ensure it's back.

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