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.
Is it destroying old snapshots or creating new ones that causes this dead time? What does each of these procedures do that could affect the system? What can I do to make this less visible to users? -- -Gary Mills- -Unix Group- -Computer and Network Services- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
