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 > > _______________________________________________ > 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/ *** 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 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- _______________________________________________ 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/
