[HPADM] Defrag VxFS Filesystems
From: Dave T. (davidlt77_at_hotmail.com)
To: firstname.lastname@example.org Date: Mon, 29 Sep 2003 09:30:51 -0400
I sent the following on Friday, but I never saw it appear in the HP-UX
Iím planning to perform defragmentation of HP-UX VxFS filesystems and Oracle
filesystems on our 11.0 and 11i boxes, using fsadm. Iíve searched the Web
and ITRC for gotchas, and following is what I have found:
1. Run the defrags after hours, due to performance implications.
2. Defrags can be run in full-blown multi-user mode.
3. Defrags on HP-UX 10.x can potentially cause data corruption, if not
patched properly. (This doesnít affect our systems, since weíre on 11.x.)
For those of you now scratching your head because youíve never defragmented
a UNIX filesystem, and youíre curious when you should do it, read the
following excerpt from the man page of fsadm_vxfs:
To determine whether a file system is fragmented, the free extents for
that file system must be examined. If a large number of small extents
are free, then there is fragmentation. If more than half of the
amount of free space is taken up by small extents (smaller than 64
blocks), or there is less than 5 percent of total file system space
available in large extents, then there is serious fragmentation.
Does anyone else have any other tidbits about performing defrags that would
-- ---> Please post QUESTIONS and SUMMARIES only!! <--- To subscribe/unsubscribe to this list, contact email@example.com Name: firstname.lastname@example.org Owner: email@example.com Archives: ftp.dutchworks.nl:/pub/digests/hpux-admin (FTP, browse only) http://www.dutchworks.nl/htbin/hpsysadmin (Web, browse & search)