Date: Wed, 02 May 2012 16:39:48 -0400 From: "Simon" <simon@optinet.com> To: "Freddie Cash" <fjwcash@gmail.com> Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: Replacing dead drives in ZRAID2 Message-ID: <20120502203949.D263E106566B@hub.freebsd.org> In-Reply-To: <CAOjFWZ4Z49%2BbV6Tvf6Am_pQQs8wGDPc9bfxZSUtA9uNcGxEN-Q@mail.gmail.com>
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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@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@gmail.com
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