Re: [Moosefs-users] Lockups

[Michal B. <mic...@ge...>]

Hi!

This is a kernel issue. There are some limits for parallel I/O operations.
You can run 'df' in the same time - 'df' is operated independently from
normal I/O operations and doesn't locks up. In real environment we do not
have such lockups. Is it your test environment or a real life one? Probably
you could do some kernel tuning to increase amount of parallel I/O
operations.


Kind regards
Michał Borychowski 
MooseFS Support Manager
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Gemius S.A.
ul. Wołoska 7, 02-672 Warszawa
Budynek MARS, klatka D
Tel.: +4822 874-41-00
Fax : +4822 874-41-01


-----Original Message-----
From: [Redhosting] Egbert Groot [mailto:eg...@re...] 
Sent: Wednesday, April 20, 2011 2:22 PM
To: moo...@li...
Subject: [Moosefs-users] Lockups

Hi All,

I've a test setup with one moosefs master and two chunkservers with each one
disk.

All three servers do mount the moosefs filesystem.

When one server  is heavily loaded, using the mounted mfs quite intense,
every 20-30 seconds, the mfs mount seems to get locked.

I can't do 'ls -l /mfsount'. It does hang for a couple of seconds (about 10
seconds).
If at the same time I do the 'ls -l /mfsmount' on one of the other servers,
there's no problem. So the lockup doesn't seem to be in the master server,
but in the client server itself.

How can I debug this is issue? Is there a way to let fuse log this kind of
info?


regards,
Egbert.