ZFS hangs very often

[Lapo Luchini]

Attila Nagy wrote:
> On 2008.03.31. 15:57, Attila Nagy wrote:
>> My system completely locks up, I can't start new processes, but 
>> runnings ones -which don't do IO- can continue (for example a top).
>> I don't know ZFS internals (BTW, /usr and others are of course 
>> different ZFS filesystems on the pool), but it might be, that 
>> something major gets locked and that's why it stops here.
> I forgot to tell -I don't know, maybe it's important-, that I have an 
> SMP box (but tried with UP kernel, the effect is the same) and 
> compression is enabled on every filesystems.

I have similar symptoms, on a Dual AMD64, 4x SATA GELI + RAIDZ.

Mainly after I turned off one drive out of 4 in a RAIDZ pool (one of the 
two SATA channel on the motherboard is flaky, I'm waiting for a new PCI 
controller) and I can consistently reproduce it mdconfig-uring a 120GB 
image of a ddrescue-d HDD and then mounting an UFS2 partition on it and 
moving massive amounts of data in that hangs within few minutes, but it 
will lock after a few hours anyways even not touching that huge file.

I'll try to produce some debugging myself ASAP...

   Lapo