Date: Thu, 4 Jul 2013 14:01:10 -0700 From: Freddie Cash <fjwcash@gmail.com> To: Steven Hartland <killing@multiplay.co.uk> Cc: FreeBSD Filesystems <freebsd-fs@freebsd.org> Subject: Re: Slow resilvering with mirrored ZIL Message-ID: <CAOjFWZ4obK1cSmvTpW%2Bt4xKdMf%2BkJV5w-sujDT1AZoepj%2B5YrA@mail.gmail.com> In-Reply-To: <43015E9015084CA6BAC6978F39D22E8B@multiplay.co.uk> References: <CABBFC07-68C2-4F43-9AFC-920D8C34282E@unixconn.com> <51D42107.1050107@digsys.bg> <2EF46A8C-6908-4160-BF99-EC610B3EA771@alumni.chalmers.se> <51D437E2.4060101@digsys.bg> <E5CCC8F551CA4627A3C7376AD63A83CC@multiplay.co.uk> <CBCA1716-A3EC-4E3B-AE0A-3C8028F6AACF@alumni.chalmers.se> <20130704000405.GA75529@icarus.home.lan> <C8C696C0-2963-4868-8BB8-6987B47C3460@alumni.chalmers.se> <20130704171637.GA94539@icarus.home.lan> <2A261BEA-4452-4F6A-8EFB-90A54D79CBB9@alumni.chalmers.se> <20130704191203.GA95642@icarus.home.lan> <43015E9015084CA6BAC6978F39D22E8B@multiplay.co.uk>
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On Thu, Jul 4, 2013 at 12:41 PM, Steven Hartland <killing@multiplay.co.uk>wrote:
> ----- Original Message ----- From: "Jeremy Chadwick" <jdc@koitsu.org>
> ...
>
>> I believe -- but I need someone else to chime in here with confirmation,
>> particularly someone who is familiar with ZFS's internals -- once your
>> pool is ashift 12, you can do a disk replacement ***without*** having to
>> do the gnop procedure (because the pool itself is already using ashift
>> 12). But again, I need someone to confirm that.
>>
>
> Close, the ashift is a property of the vdev and not the entire pool so
> if your adding a new vdev to the pool at least one of the devices in
> said pool needs to report 4k sectors either natively or via the gnop
>
^^^^^^^^^^^^
> work around.
>
Typo?
"... so if you're adding a new vdev to the pool at least one of the devices
in
said VDEV needs to report ..."
I made the mistake of thinking ashift was a property of the pool and added
3x 6-drive raidz2 vdevs to an existing pool of 4x 6-drive raidz vdevs
without using gnop .... and now have 3 vdevs with ashift=9 and 4 vdevs with
ashift=12. :( Here's hoping the box gets replaced before 512b drives are
discontinued completely ...
I now have it on my "zpool add" checklist to always use gnop devices,
regardless of what kind of drive is being used.
--
Freddie Cash
fjwcash@gmail.com
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