[OpenAFS] cache manager locked under heavy load?

[Russ Allbery]

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/>