Replacing dead drives in ZRAID2

[Simon]

I'm not saying it is ZFS. What I am saying is that I have setup ZRAID2 using
3x U320 SCSI drives connected to SAF-TE backplane connected to Adaptec
7902 controller. When I pull 2 out of 3 drives out, the system freezes where
no new requests are being processed and the ahb driver starts throwing a fit.

Is this normal/expected behaviour? I cannot pull drives out from hotswappable
enclosure to simulate drive failure? if so, what would happen if a drive did fail
while inside the enclosure? what would be different? I cannot trust RAID setup
where I cannot pull/disconnect a drive and expect the system to continue to
run smoothly.

BTW, I'm not sure if this matters or not but I'm setting up ZRAID2 using GPT
partitions as shown here:

http://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/9.0-RELEASE

Can someone confirm whether or not I can use Adaptec 7902 with ZRAID?

-Simon

On Wed, 2 May 2012 10:50:48 -0700, Freddie Cash wrote:

>On Wed, May 2, 2012 at 10:27 AM, Simon <simon at optinet.com> wrote:
>> I don't expect miracles from ZFS if hardware is not compatible. However,
>> I did expect for ahd driver and Adaptec U320 to still be fairly common and
>> well aged, thus being compatible, but perhaps that isn't the case.
>>
>> Is there a list of compatible controllers?
>>
>> I do not understand how formatting a drive using UFS would solve my
>> issues. I pulled 2 drives out from functional zraid2 to simulate drive
>> failure and the system froze. Clearly there is an issue using this controller with
>> ZFS in ZRAID setup. It shouldn't matter what I have installed on a drive.
>> When a drive is pulled out of hot-plug enclosure, it should get marked as
>> offline.

>Until you format drives with something other than ZFS and test
>removing/plugging in a drive, you cannot say for certain that it's a
>ZFS issue.  The error messages shown all come from ahd which is way
>below ZFS.

>-- 
>Freddie Cash
>fjwcash at gmail.com