Solaris 10, Samba 3.0.25a - Server dies copying big files to ZFS volume

Hope someone can help me with this problem, cos I am at my wits end.
We have Solaris 10 Update 2 running on a Sunfire V215 Sparc Server with 2 large storage arrays running ZFS
When copying a large file via samba, after about say 200-300megs... the copy just stops... and the samba server becomes unresponsive for quite a while.
When we first noticed the problem, we had the original Samba 3.0.11 which shiped with SOL 10 Up2, so we hoped the upgrade to Samba 3.0.25a would fix the problem. No such luck.
I have tested with FTP (the same 2.6 GB file) and that transfers completely and very fast, so I am pretty damn sure its not a hardware issue.
I have tested with varios samba configurations. Vanilla configs, tweaked configs, configs which people claim solve some issues... again no luck.
I have looked around these forums and seen that some people have experience samba issues when upgrading from Sol 9 to Sol 10.
Please if ANYONE has any ideas what could be causing this and how to solve it, I would be extremely greatful
Thanks
//Steve
Edited by: reyortsed on Sep 23, 2008 12:29 PM

Update 2 is pretty old, especially if you are talking about ZFS. There's been a variety of problems fixed in ZFS since U2. Were I to just guess out of the blue, you might be running into the ZFS eats all of RAM bug.
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6505658
If this is the case, it won't be just the samba server that's slow on the server. You should check this by doing the FTP after your samba server slows down and see if you get fast throughputs.
-r

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