On Wed, Dec 16, 2009 at 6:41 PM, Chris Murray <chrismurra...@gmail.com> wrote: > Hi, > > I run a number of virtual machines on ESXi 4, which reside in ZFS file > systems and are accessed over NFS. I've found that if I enable dedup, > the virtual machines immediately become unusable, hang, and whole > datastores disappear from ESXi's view. (See the attached screenshot from > vSphere client at around the 21:54 mark for the drop in connectivity). > I'm on OpenSolaris Preview, build 128a. > > I've set dedup to what I believe are the least resource-intensive > settings - "checksum=fletcher4" on the pool, & "dedup=on" rather than
I believe checksum=fletcher4 is acceptable in dedup=verify mode only. What you're doing is seemingly deduplication with weak checksum w/o verification. Regards, Andrey > verify, but it is still the same. > > Where can I start troubleshooting? I get the feeling that my hardware > isn't up to the job, but some numbers to verify that would be nice > before I start investigating an upgrade. > > "vmstat" showed plenty of idle CPU cycles, and "zpool iostat" just > showed slow throughput, as the ESXi graph does. As soon as I set > dedup=off, the virtual machines leapt into action again (22:15 on the > screenshot). > > Many thanks, > Chris > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss > > _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
