Date: Tue, 27 Oct 2009 10:43:16 -0400 From: jfarmer@goldsword.com To: freebsd-stable@freebsd.org Subject: Re: whats best pracfive for ZFS on a whole disc these days ? Message-ID: <20091027104316.dsp7kikkoogo80gw@www.goldsword.com> In-Reply-To: <200910271902.19618.doconnor@gsoft.com.au> References: <E1N2NcA-0004c4-CE@dilbert.ticketswitch.com> <200910271646.55227.doconnor@gsoft.com.au> <ed91d4a80910262359p7acab9b9i5555b06fe0e46c6b@mail.gmail.com> <200910271902.19618.doconnor@gsoft.com.au>
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Quoting Daniel O'Connor <doconnor@gsoft.com.au>:
> On Tue, 27 Oct 2009, Artem Belevich wrote:
>> > Unfortunately it appears ZFS doesn't search for GPT partitions so
>> > if you have them and swap the drives around you need to fix it up
>> > manually.
>>
>> When I used raw disk or GPT partitions, if disk order was changed the
>> pool would come up in 'DEGRADED' or UNAVAILABLE state. Even then all
>> that had to be done is export/import the pool. After the pool has
>> been re-imported it was back to ONLINE.
>
> Hmm OK, I thought it supposedly DTRT for raw disks but apparently not.
>
>> Now I'm using GPT labels (gpart -l) specifically because that avoids
>> issues with disk order or driver change. The pool I've built from GPT
>> labels has survived several migrations between different
>> controllers/drivers adX (ata) -> daX (SATA disks on mpt) -> adaX
>> (ahci) and multiple drive permutations without any manual
>> intervention at all. All that was done on 8-RC1/amd64.
>> I have also successfully imported the pool on OpenSolaris and back
>> again on FreeBSD.
>
> Damn, if I'd realised I'd have done that :)
>
> Do you know if it's possible to change?
>
Check the archives for stable@ and fs@. I believe that there was a
thread not that long ago detailing exactly how to do that. IIRC,
while it took a bit of work, it wasn't difficult.
John
-----------------------------------------------------------------
J. T. Farmer <jfarmer@goldsword.com> <jfarmer@orfencer.org>
GoldSword Systems, Knoxville TN Coach & Instructor
Consulting, Knoxville Academy of the Blade
Software Development, Maryville Fencing Club
Project Management
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