zfsonlinux/zfs — Issue #595: ZFS hangs after heavy work
Author: bountin
Created: 2012-03-08 18:54:05+00:00
State: open

I'm using my ZFS pool to archive my mac using timemachine and for other archiving stuff.

Sometimes during the backup process of a fresh backup (about 150GB) which writes with about 100-200Mbit/s zfs freezes and the whole system is unusable. I'm receiving the login 'form' via ssh but it hangs after entering the credentials. Active ssh sessions are unable to spawn new processes, they just do nothing and are not able to be aborted via Ctrl+C.

Scrubbing doesn't detect any error.

The kern.log: https://gist.github.com/2002476

My setup:
I'm using the daily packages for ubuntu located at https://launchpad.net/~zfs-native/+archive/daily which is 0.6.0.52-0ubuntu1~oneiric1. The stable version produced simmilar errors.

root@ubuntu:~# zpool status
pool: tank
state: ONLINE
scan: scrub in progress since Thu Mar 8 19:17:00 2012
101G scanned out of 4.23T at 164M/s, 7h21m to go
0 repaired, 2.33% done
config:

NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
sdb ONLINE 0 0 0
sde ONLINE 0 0 0
sdg ONLINE 0 0 0
sdd ONLINE 0 0 0
sdf ONLINE 0 0 0

errors: No known data errors

root@ubuntu:~# uname -a
Linux ubuntu 3.0.0-16-generic #28-Ubuntu SMP Fri Jan 27 17:44:39 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

If you need more information, do not hesitate to ask for it.