Date: Sun, 31 May 2009 19:14:06 -0700 From: Freddie Cash <fjwcash@gmail.com> To: freebsd-hackers@freebsd.org Subject: Re: Request for opinions - gvinum or ccd? Message-ID: <b269bc570905311914k5f0aefe2n5c87a881fd81d5fb@mail.gmail.com> In-Reply-To: <20090531235943.GA77374@logik.internal.network> References: <20090530175239.GA25604@logik.internal.network> <20090530144354.2255f722@bhuda.mired.org> <20090530191840.GA68514@logik.internal.network> <20090530162744.5d77e9d1@bhuda.mired.org> <A5BB2D2B836A4438B1B7BD8420FCC6A3@uk.tiscali.intl> <20090531201445.GA82420@logik.internal.network> <alpine.BSF.2.00.0905312355240.26545@wojtek.tensor.gdynia.pl> <0229B3BF1BE94C82AA11FD06CBE0BDEF@uk.tiscali.intl> <20090531235943.GA77374@logik.internal.network>
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On Sun, May 31, 2009 at 4:59 PM, <xorquewasp@googlemail.com> wrote: > There is one last thing I'd like clarified. From the zpool > manpage: > > =C2=A0In order =C2=A0to take advantage of these features, a pool must mak= e use of > =C2=A0some form of redundancy, using either mirrored or raidz =C2=A0group= s. =C2=A0While > =C2=A0ZFS =C2=A0supports running in a non-redundant configuration, where = each root > =C2=A0vdev is simply a disk or file, this is strongly discouraged. =C2=A0= A =C2=A0single > =C2=A0case of bit corruption can render some or all of your data unavaila= ble. > > Is this supposed to mean: > > =C2=A0"ZFS is more fragile than most. If you don't use redundancy, one > =C2=A0 case of bit corruption will destroy the filesystem" > > Or: > > =C2=A0"Hard disks explode often. Use redundancy." Unless you specify mirror or raidz on the create/add line, zfs (in essence) creates a RAID0 stripe of all the vdevs. Hence, if a single drive dies, the whole thing dies. Just like in a normal hardware/software RAID0 array. Nothing special or new here. Just like "normal" RAID, unless you add redundancy (RAID1/5/6) to a stripe set, losing a single disk means losing the whole array. --=20 Freddie Cash fjwcash@gmail.com
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