[zfs-discuss] [Blade 150] ZFS: extreme low performance
Hi forum, I'm currently a little playing around with ZFS on my workstation. I created a standard mirrored pool over 2 disk-slices. # zpool status Pool: mypool Status: ONLINE scrub: Keine erforderlich config: NAME STATE READ WRITE CKSUM mypoolONLINE 0 0 0 mirrorONLINE 0 0 0 c0t0d0s4 ONLINE 0 0 0 c0t2d0s4 ONLINE 0 0 0 Then i created a ZFS with no extra options: # zfs create mypool/zfs01 # zfs list NAME USED AVAIL REFER MOUNTPOINT mypool 106K 27,8G 25,5K /mypool mypool/zfs01 24,5K 27,8G 24,5K /mypool/zfs01 When I now send a mkfile on the new FS, the performance of the whole system breaks down near zero: # mkfile 5g test last pid: 25286; load avg: 3.54, 2.28, 1.29; up 0+01:44:26 16:16:24 66 processes: 61 sleeping, 3 running, 1 zombie, 1 on cpu CPU states: 0.0% idle, 2.1% user, 97.9% kernel, 0.0% iowait, 0.0% swap Memory: 512M phys mem, 65M free mem, 2050M swap, 2050M free swap PID USERNAME LWP PRI NICE SIZE RES STATETIMECPU COMMAND 25285 root 1 84 1184K 752K run 0:09 66.28% mkfile It seams that some kind of kernel activity while writing to ZFS blocks the system. Is this a known problem? Do you need additional information? regards Mathias This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
[zfs-discuss] Re: ZFS imported simultanously on 2 systems...
Well, we are using the -f parameter to test failover functionality. If one system with mounted ZFS is down, we have to use the force to mount it on the failover system. But when the failed system comes online again, it remounts the ZFS without errors, so it is mounted simultanously on both nodes That's the real problem we have :[ mfg Mathias I think this is user error: the man page explicitly says: -f Forces import, even if the pool appears to be potentially active. y what you did. If the behaviour had been the same without the -f option, I guess this would be a bug. HTH This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
[zfs-discuss] Re: ZFS imported simultanously on 2 systems...
Without -f option, the ZFS can't be imported while reserved for the other host, even if that host is down. As I said, we are testing ZFS as a [b]replacement for VxVM[/b], which we are using atm. So as a result our tests have failed and we have to keep on using Veritas. Thanks for all your answers. This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
[zfs-discuss] Re: Re: Re: ZFS imported simultanously on 2 systems...
[...] a product which is *not* currently multi-host-aware to behave in the same safe manner as one which is. That`s the point we figured out while testing it ;) I just wanted to have our thoughts reviewed by other ZFS users. Our next steps IF the failover would have succeeded would be to create a little ZFS-agent for a VCS testing cluster. We haven't used Sun Cluster and won't use it in future. regards Mathias This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
