ufs, logging, and fsck

From: Bischof Jr., Ralph F. (Ralph.Bischof@nsoc.nasa.gov)
Date: Thu Jun 12 2003 - 09:58:26 EDT


Good morning,

        Sun V880. Solaris 9. Several ufs file systems. Two of these are .5TB each.
The other day, Mr. Exabyte decided to lock up Mr. SCSI channel to the point
that a reboot was required. The system could not shutdown properly and the
file systems were left in an inconsistent state. Due to a mandatory fsck of
the file systems, it took two hours to boot.

        In looking at the man page for mount_ufs, there is a "logging" option. I have
had no experience with such. It mentions that it logs the complete transaction
for ufs. It also mentions that it will take 1MB of free space for each 1GB of
file system, up to a max of 64MB. Of course, the reason that I am interested
in this option is to do away with the fsck need.

        Since 500GB is much more than 64GB, can I use it at all? If so, what type of
performance hit will I see? Since I am running an Oracle database on one file
system and writing regular ascii log files on another, is this just a stupid
idea? Are there are other issues that may affect my situation (and my job)?

        I appreciate all replies.

Thank you,

--
Ralph F. Bischof, Jr.
IT Security
Systems Administrator
(256) 544-3982
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