"Tom "Mad Dog" Yergeau" MadDog@fool.com writes

Since upgrading a filer to OT6.1, I've noticed a lot of these messages in the log file:

Sat May 12 23:24:02 EDT [wafl_CP_proc:info]: Starting summary cleanup on volume vol1. Sat May 12 23:24:04 EDT [wafl_lopri:info]: Volume vol1, summary cleanup complete.

They only occur for vol1, not vol0, an although they generally occur at 4 hour intervals I've also seem them occur 1/2 dozen times in 10 minutes.

Can anyone explain what a "summary cleanup" is, why it was added in 6.1, and how come there's no real pattern to when they happen?

They aren't exactly "new in 6.1" as I saw these in 6.0.1R3. They occur as part of the extended process of turning on zoned checksums. Once "vol status -c" is saying

Volume Checksum style Checksum status XXXX zoned Checksums initializing: WAFL upgrade will complete when the following snapshots are deleted:

then each time a snapshot is deleted (whether it's one of those created before the upgrade started or not) a message of this form appears. That can happen as part of the normal snapshot schedule, but I would guess that the ones occuring "1/2 dozen times in 10 minutes" are snapshots associated with dumps.

The messages stop once the volume is fully upgraded. There's also a significant spike in processor and I/O activity associated with each message (although far less than that associated with snapshot creation or deletion pre-6.0), and that also stops when zones checksums are fully active.

Chris Thompson University of Cambridge Computing Service, Email: cet1@ucs.cam.ac.uk New Museums Site, Cambridge CB2 3QG, Phone: +44 1223 334715 United Kingdom.