Date: Sun, 24 Aug 2014 21:23:10 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: Michael Sierchio <kudzu@tenebras.com> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: some ZFS questions Message-ID: <alpine.BSF.2.11.1408242118330.2348@wonkity.com> In-Reply-To: <CAHu1Y70_EM3JUS_dfKv2gm8GCfM7KEbP4q7JmYSG5o%2BD=vFjyA@mail.gmail.com> References: <201408070816.s778G9ug015988@sdf.org> <40AF5B49-80AF-4FE2-BA14-BFF86164EAA8@kraus-haus.org> <201408211007.s7LA7YGd002430@sdf.org> <E32981BF-613C-49D9-B7F8-18B9A99C0141@kraus-haus.org> <201408241015.s7OAFRv7010196@sdf.org> <20140825014249.GA28995@neutralgood.org> <CAHu1Y71U1CnU=iCdNf902YiLzaJ4TtpZMwpjN6xms_Xuwsbu9Q@mail.gmail.com> <alpine.BSF.2.11.1408242059290.2348@wonkity.com> <CAHu1Y70_EM3JUS_dfKv2gm8GCfM7KEbP4q7JmYSG5o%2BD=vFjyA@mail.gmail.com>
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On Sun, 24 Aug 2014, Michael Sierchio wrote: > On Sun, Aug 24, 2014 at 8:00 PM, Warren Block <wblock@wonkity.com> wrote: >> On Sun, 24 Aug 2014, Michael Sierchio wrote: >> >>> On Sun, Aug 24, 2014 at 6:42 PM, <kpneal@pobox.com> wrote: >>> >>> >>>> If you can use GPT partitioning then you can have GPT labels on >>>> partitions >>>> spanning entire disks. Then you can rearrange physical disks to your >>>> hearts >>>> content. >>>> >>>> The bonus is that you can put identifying information in the label name >>>> to be even more sure you are replacing the correct disk when the time >>>> comes. >>> >>> >>> You can do this - and it's the approach that FreeNAS takes, but you >>> lose the benefits of presenting a whole disk to ZFS - the ability to >>> fully use the disk cache when presented a raw device rather than a >>> partition. >> >> >> I thought that was a Solaris-only limitation. In fact, I'm pretty sure it >> is, and does not apply on FreeBSD. > > You mean Solaris-only benefit? No, I mean that the disk cache problem was only on Solaris, and does not apply to FreeBSD. On FreeBSD, there is no difference in performance between partitions versus the whole disk.
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