Thank you, Mr.Mauelshagen JFS can not have fixed block size. But I heard from JFS group in IBM that on 2.5 or later it will be improved. I do not know JFS will have fixed block size or not. They said 'improved'. I think LVM(2?) will be able to handle non-consitant block size on 2.5 well. "Heinz J . Mauelshagen" wrote: > > On Fri, Nov 01, 2002 at 12:07:40PM +0900, Miwako Nakai wrote: > > I'm using jfs on lvm/raid5 with snapshot. > > > > When I copy file, it happens frequently > > 'raid5: switching cache buffer size XXX -> XXX'. > > This message appears to syslog. It caused speed down to access disks. > > So, I cut this message. It's seemed ok. > > Could be filesystems with different blocksizes accessing the underlying > raid5 md through LVM constantly forcing the raid5 stripe cache to be flushed. > If that's the case, you want to put filesystems of the _same_ blocksize > onto all of the logical volumes allocated to the raid5 device. > > Regards, > Heinz -- The LVM Guy -- > > > > > But it's still going to switch cache buffer size. I think it cost > > some cpu time. When switching buffer cache size, it always happen > > reflushing memories. > > > > I want to fix buffer size. What shall I do? > > I asked JFS group. But they do nothing about cache buffer. > > > > kernel 2.4.20-pre10-ac2 > > lvm 1.0.5 > > jfs 1.0.23 > > > > -- > > nakai@ezinc.com > > *** Software bugs are stupid. > Nevertheless it needs not so stupid people to solve them *** > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > > Heinz Mauelshagen Sistina Software Inc. > Senior Consultant/Developer Am Sonnenhang 11 > 56242 Marienrachdorf > Germany > Mauelshagen@Sistina.com +49 2626 141200 > FAX 924446 > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- -- nakai@ezinc.com _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
