We have a moderately sized Cyrus installation with 2 TB of storage and a few thousand simultaneous IMAP sessions. When one of the backup processes is running during the day, there's a noticable slowdown in IMAP client performance. When I start my `mutt' mail reader, it pauses for several seconds at `Selecting INBOX'. That behavior disappears when the backup finishes.
The IMAP server is a T2000 with six ZFS filesystems that correspond to Cyrus partitions. Storage is four Iscsi LUNs from our Netapp filer. The backup in question is done with EMC Networker. I've looked at zpool I/O statistics when the backup is running, but there's nothing clearly wrong. I'm wondering if perhaps all the read activity by the backup system is causing trouble with ZFS' caching. Is there some way to examine this area? -- -Gary Mills- -Unix Support- -U of M Academic Computing and Networking- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
