Date: Sat, 26 Mar 2011 10:23:36 -0500 (CDT) From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us> To: Anders Andersson <pipatron@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: RAID-Z in a disk-failure. Message-ID: <alpine.GSO.2.01.1103261015180.10593@freddy.simplesystems.org> In-Reply-To: <AANLkTimzb0timUQTfokYga3DNCC_bONhCjyEUgf_eGsd@mail.gmail.com> References: <AANLkTimzb0timUQTfokYga3DNCC_bONhCjyEUgf_eGsd@mail.gmail.com>
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On Sat, 26 Mar 2011, Anders Andersson wrote: > > Have I missed something in this scenario? I think that your summary is pretty accurate. However, it is worth noting that zfs stores redundant copies of metadata blocks, and may optionally store redundant copies of user data blocks. Zfs offers raidz2 for the same reasons that storage array vendors offer RAID6 (vs RAID5). With today's large disks, a secondary data failure is not unlikely. If you use zfs mirroring or raidz1, then a periodic zfs scrub is recommended in order to decrease the possibility of secondary data failure. I would definitely do an initial zfs scrub after initially populating a pool with data. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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