[OpenAFS] cache manager locked under heavy load?

Russ Allbery rra@stanford.edu
Sat, 06 Feb 2010 12:43:10 -0800

Alena Manova <nymano@seznam.cz> writes:

> we have Apache webservers (with pretty high traffic) reading the content
> from AFS. normally the system runs fine, but at certain point (probably
> related to I/O load) AFS stops responding and all system load massively
> rises - all of the apache processes stuck in state "sending
> reply". restarting apache recovers the state.

> the cmdebug at the time shows messages similar to:
> Lock afs_xvcache status: (writer_waitingupgrade_waiting, upgrade_locked(pid:18571 at:5), 1 read_locks(pid:16782), 954 waiters)
> Lock afs_xvcache status: (writer_waitingupgrade_waiting, upgrade_locked(pid:16639 at:5), 713 waiters)

> The cache manager has 1GB cache size (tried even more with no
> results). The afs fileservers are in that time fine and other clients
> can access it.

We used to see this and then it went away with the current client cache
manager.  What version of OpenAFS are you using on your clients?

Russ Allbery (rra@stanford.edu)             <http://www.eyrie.org/~eagle/>