ZFS vs OSX Time Machine

[Daniel O'Connor]

Does anyone else use ZFS to store TM backups?

I find that whenever my laptop (over wifi!) starts a TM the ZFS machine it's backing up to grinds to a halt.. Other systems streaming stuff over NFS from it also tend to stall..

I presume that TM is doing something which causes ZFS some issues but I'm not sure how to find out what the real problem is let alone how to fix it..

I am running FreeBSD midget.dons.net.au 8.2-PRERELEASE FreeBSD 8.2-PRERELEASE #8 r217094M: Sat Jan  8 11:15:07 CST 2011     darius at midget.dons.net.au:/usr/obj/usr/src/sys/MIDGET  amd64

It is a 5 disk RAIDZ1 with 1.29Tb free using WD10EADS drives.

I don't see any SMART errors or ZFS warnings.

I have the following ZFS related tunables

vfs.zfs.arc_max="3072M"
vfs.zfs.prefetch_disable="1" 
vfs.zfs.txg.timeout=5
vfs.zfs.cache_flush_disable=1

Any help appreciated, thanks :)

--
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C