Many processes stuck in zfs

[Stefan Bethke]

Am 10.03.2010 um 12:35 schrieb Ollivier Robert:

> According to Stefan Bethke:
>> The situation seems to be triggered by zfs receive'ing snapshots from the sister machine (both synchronize their active ZFS filesystems to each other, using zfs send and zfs receive).  It appears it's the receiving causing trouble.
> 
> Have you tuned kern.maxvnodes in /etc/sysctl.conf?
> 
> When I move to this new machine, I forgot to get it much higher than the default (now I use 200000) and it was locking up pretty soon.  Had not a single lockup now.

I haven't, it's at the default of 100000.  How would I be able to tell if that limit is being reached?

Right now:
$ sysctl kern.maxvnodes vfs.numvnodes vfs.freevnodes
kern.maxvnodes: 100000
vfs.numvnodes: 87287
vfs.freevnodes: 24993
and on the sister host:
$ sysctl kern.maxvnodes vfs.numvnodes vfs.freevnodes
kern.maxvnodes: 100000
vfs.numvnodes: 87681
vfs.freevnodes: 7600

Is there a rule of thumb what maxvnodes should be tuned to?


Stefan

-- 
Stefan Bethke <stb at lassitu.de>   Fon +49 151 14070811