On Saturday 22 May 2004 00:13, Lyvim Xaphir wrote: > 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
Interesting. And I think the defragging can be set up as a cron job. My experience with JFS stems from my OS/2 days, and I don't remember I ever had to defrag it. In OS/2 there was a nifty feature, a graphical representation of the filesystem. One could actually see how it worked, distributing files in a very clever manner. Fragmentation never amounted to more then 2 %. Next time I do a clean install, I'll try it on linux, although I have no complaints whatsoever with my ReiserFS. Kaj Haulrich. -- * Sent from a 100 % Microsoft-free computer * * running Linux kernel 2.6.4 on Mandrake 10.0 *
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