ZFS question

Quartz quartz at sneakertech.com
Thu Mar 21 03:45:30 UTC 2013

> Several people, including me, have an issue like this with 9.1.  Your
> best bet is to try 9.0.

Hmm... interesting. Is there any consensus as to what's going on?

Before anyone jumps to conclusions though, lemme just post the whole 
issue so we're on the same page (apologizes if it turns out this isn't 
the right mailing list for this):

I have a raidz2 comprised of six sata drives connected via my 
motherboard's intel southbridge sata ports. All of the bios raid options 
are disabled and the drives are in straight ahci mode (hotswap enabled). 
The system (accounts, home dir, etc) is installed on a separate 7th 
drive formatted as normal ufs, connected to a separate non-intel 
motherboard port.

As part of my initial stress testing, I'm simulating failures by popping 
the sata cable to various drives in the 6x pool. If I pop two drives, 
the pool goes into 'degraded' mode and everything works as expected. I 
can zero and replace the drives, etc, no problem. However, when I pop a 
third drive, the machine becomes VERY unstable. I can nose around the 
boot drive just fine, but anything involving i/o that so much as sneezes 
in the general direction of the pool hangs the machine. Once this 
happens I can log in via ssh, but that's pretty much it. I've 
reinstalled and tested this over a dozen times, and it's perfectly 

`ls` the dir where the pool is mounted? hang.
I'm already in the dir, and try to `cd` back to my home dir? hang.
zpool destroy? hang.
zpool replace? hang.
zpool history? hang.
shutdown -r now? gets halfway through, then hang.
reboot -q? same as shutdown.

The machine never recovers (at least, not inside 35 minutes, which is 
the most I'm willing to wait). Reconnecting the drives has no effect. My 
only option is to hard reset the machine with the front panel button. 
Googling for info suggested I try changing the pool's "failmode" setting 
from "wait" to "continue", but that doesn't appear to make any 
difference. For reference, this is a virgin 9.1-release installed off 
the dvd image with no ports or packages or any extra anything.

I don't think I'm doing anything wrong procedure wise. I fully 
understand and accept that a raidz2 with three dead drives is toast, but 
I will NOT accept having it take down the rest of the machine with it. 
As it stands, I can't even reliably look at what state the pool is in. I 
can't even nuke the pool and start over without taking the whole machine 

it has a certain smooth-brained appeal

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