home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!ogicse!uwm.edu!zaphod.mps.ohio-state.edu!uunet.ca!cognos!maklinm
- From: maklinm@cognos.com (Max Maklin)
- Newsgroups: comp.unix.ultrix
- Subject: Re: SUMMARY: disk I/O slowdown with Ultrix 4.3
- Message-ID: <1992Nov10.031427.25982@cognos.com>
- Date: 10 Nov 92 03:14:27 GMT
- Article-I.D.: cognos.1992Nov10.031427.25982
- References: <1992Oct26.181727.8322@mintaka.lcs.mit.edu> <1dlui8INN805@life.ai.mit.edu> <1992Nov9.160141.18573@decuac.dec.com>
- Sender: news@cognos.com (News Administrator)
- Organization: Cognos Incorporated, Ottawa CANADA
- Lines: 36
- Nntp-Posting-Host: concorde
-
- In article <1992Nov9.160141.18573@decuac.dec.com> mjr@hussar.dco.dec.com (Marcus J. Ranum) writes:
- :^()
- :^() Mea culpa. I was parrotting something that the fellow in charge
- :^() of the group that did the I/O enhancement stuff had said was a good
- :^() set of parameters to use. I either remembered wrong, or had a value
- :^() for the '56 that was out of whack.
-
- It would be interesting Marcus if you get the fellow in charge to take a
- number of "typical" systems, and typical disks and let us know what the
- best parameters are. I am not in the postition to play with my disks (R&D
- environment), but given a set of parameters and would take the time to
- dump, newfs, tunefs, restore to get the better performance. If anyone has
- the numbers for a 5500, asc controller and RZ57 and RZ58 disks, I'll take
- them :)
-
- :^()
- :^() One interesting note about the I/O enhancer stuff that everyone
- :^() should be aware of: it now makes fragmentation a possible issue for
- :^() ULTRIX. Now we need to worry about defragging our disks every so often.
- :^() I don't really know (though I'm trying to find out) how to tell if a
- :^() disk is getting fragged (other than that it slows down) and right now
- :^() there's no known tools for defragging a disk other than dump, newfs,
- :^() and restore. I figure I'm just not going to worry about it on my
- :^() systems. ;)
- :^()
-
- For us that have been running 4.2 filesystems from Sun and hfs from HP
- and others this is nothing new. I usually do it once or twice a year
- to each disk.
-
- Max
- --
- Max Maklin P.O. Box 9707
- Technical Analyst 3755 Riverside Drive
- Cognos Incorporated Ottawa, Ontario CANADA
- Internet: maklinm@cognos.COM UUNet: maklinm@cognos.UUCP
-