On Thu, Mar 04, 2010 at 04:20:10PM -0600, Gary Mills wrote: > We have an IMAP e-mail server running on a Solaris 10 10/09 system. > It uses six ZFS filesystems built on a single zpool with 14 daily > snapshots. Every day at 11:56, a cron command destroys the oldest > snapshots and creates new ones, both recursively. For about four > minutes thereafter, the load average drops and I/O to the disk devices > drops to almost zero. Then, the load average shoots up to about ten > times normal and then declines to normal over about four minutes, as > disk activity resumes. The statistics return to their normal state > about ten minutes after the cron command runs.
I should mention that this seems to be a new problem. We've been using the same scheme to cycle snapshots for several years. The complaints of an unresponsive interval have only happened recently. I'm still waiting for our help desk to report on when the complaints started. It may be the result of some recent change we made, but so far I can't tell what that might have been. -- -Gary Mills- -Unix Group- -Computer and Network Services- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
