Hi,
We have a X4150 with a J4400 attached. Configured with 2x32GB SSD's, in mirror configuration (ZIL) and 12x 500GB SATA disks. We are running this setup for over a half year now in production for NFS and iSCSI for a bunch of virtual machines (currently about 100 VM's, Mostly Linux, some Windows)
Since last week we have performance problems, cause IO Wait in the VM's. Of course we did a big search in networking issue's, hanging machines, filewall & traffic tests, but were unable to find any problems. So we had a look into the zpool and dropped one of the mirrored SSD's from the pool (we had some indication the ZIL was not working ok). No success. After adding the disk, we discovered the IO wait during the "resilvering" process was OK, or at least much better, again. So last night we did the same handling, dropped & added the same disk, and yes, again, the IO wait looked better. This morning the same story.
Because this machine is a production machine, we cannot tolerate to much experiments. We now know this operation saves us for about 4 to 6 hours (time to resilvering), but we didn't had the courage to detach/attach the other SSD yet. We will try only a "resilver", without detach/attach, this night, to see what happens.
Can anybody explain how the detach/attach and resilver process works, and especially if there is something different during the resilvering and the handling of the SSD's/slog disks?
Regards, Mart -- Greenhost - Duurzame Hosting Derde Kostverlorenkade 35 1054 TS Amsterdam T: 020 489 4349 F: 020 489 2306 KvK: 34187349 _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
