On 06 May, 2011 - Erik Trimble sent me these 1,8K bytes: > If dedup isn't enabled, snapshot and data deletion is very light on RAM > requirements, and generally won't need to do much (if any) disk I/O. > Such deletion should take milliseconds to a minute or so.
.. or hours. We've had problems on an old raidz2 that a recursive snapshot creation over ~800 filesystems could take quite some time, up until the sata-scsi disk box ate the pool. Now we're using raid10 on a scsi box, and it takes 3-15 minute or so, during which sync writes (NFS) are almost unusable. Using 2 fast usb sticks as l2arc, waiting for a Vertex2EX and a Vertex3 to arrive for ZIL&L2ARC testing. IO to the filesystems are quite low (50 writes, 500k data per sec average), but snapshot times goes waay up during backups. /Tomas -- Tomas Ögren, st...@acc.umu.se, http://www.acc.umu.se/~stric/ |- Student at Computing Science, University of Umeå `- Sysadmin at {cs,acc}.umu.se _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
