Date: Sun, 27 Jan 2013 22:05:05 -0800 From: Michael Sierchio <kudzu@tenebras.com> To: freebsd-questions@freebsd.org Subject: Re: ZFS - whole disk or partition or BSD slice? Message-ID: <CAHu1Y73i0645eP_M1fogOtUAuVw-Fb4c7f%2B-rFX%2B6z7-4ea9nw@mail.gmail.com> In-Reply-To: <5105D611.4000506@ShaneWare.Biz> References: <5105BEE4.4030402@mansionfamily.plus.com> <5105D611.4000506@ShaneWare.Biz>
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On Sun, Jan 27, 2013 at 5:36 PM, Shane Ambler <FreeBSD@shaneware.biz> wrote: > I recall reading that using partitions for zfs on FreeBSD was as good as > full disks. No, it isn't - ZFS can fully utilize disk caches when presented with whole devices. There are possible reasons to create partitions - one being that if an unfriendly OS sees the device, it won't try to initialize it if it sees a partition map. Another is using a cheap RAID controller that can't be fully disabled - in which case you generally need to create a partition that doesn't include the last few sectors of the disk, where such controllers keep magic data. - M
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