On Tue, 2004-05-18 at 16:35, Kaj Haulrich wrote: > On Tuesday 18 May 2004 22:15, Stephen Kuhn wrote: > > On Wed, 2004-05-19 at 06:07, Kaj Haulrich wrote: > > > On Tuesday 18 May 2004 21:12, PM wrote: > > > > On Tue, 2004-05-18 at 15:03, Michael Tienhaara wrote: > > > > > Thanks for the reply. Now I'm curious....how? Does it > > > > > defrag "on the fly?" Or, at set times? > > > > > Michael > > > > > > > > It's a completely different file system to MS dos ( in its > > > > various forms), and doesn't fragment files (not so you'd > > > > notice, anyway) so there's no need to defrag. > > > > > > ...which is not entirely true, though. In filesystems like > > > ext2, ext3, ReiserFS and XFS there is no need whatsoever to > > > defrag, but in IBM's JFS is is recommended to do so now and > > > then. > > > > > > Kaj haulrich. > > > > That's IBM for ya. > > Well Stephen, I must admit that IBM gets more and more of my respect > these days, what with them supporting Linux, standing up against > SCO and all that. That aside, their JFS (Journalling File System) > is a legacy system inherited from OS/2 Warp. The defragging issue > is a bargain pay for the incredible speed and stability og that > filesystem. > > Kaj Haulrich.
Kaj, you are dead on right. I just got thru testing JFS on some new systems for some customers of mine, and I was astounded at the responsiveness of the boxes after I got it installed. The reason is the super low CPU utilization of JFS; it does it's job on a par with XFS speedwise, but yet consumes far less CPU cycles. This gives a <2000mhz machine a very snappy feel. Snappier even than my 2k. The next time I format, which will be soon, I'm going to see how JFS performs on top of my RAID array. I love XFS, but JFS just has too much going for it. By way of confirmation, please witness these latest benchmarks in Linux Gazette which bear out what you are saying: http://linuxgazette.net/102/piszcz.html LX
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