Date: Fri, 1 Jun 2012 10:07:03 -0400 (EDT) From: Daniel Feenberg <feenberg@nber.org> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: Kaya Saman <kayasaman@gmail.com>, freebsd-questions@freebsd.org, Oscar Hodgson <oscar.hodgson@gmail.com> Subject: Re: Anyone using freebsd ZFS for large storage servers? Message-ID: <alpine.DEB.2.00.1206010952050.9474@sas1.nber.org> In-Reply-To: <alpine.BSF.2.00.1206011435430.20357@wojtek.tensor.gdynia.pl> References: <CACxnZKM__Lt9LMabyUC_HOCg2zsMT=3bpqwVrGj16py1A=qffg@mail.gmail.com> <alpine.BSF.2.00.1206011048010.2497@wojtek.tensor.gdynia.pl> <CAPj0R5%2BLcKUGijT17W6RXBz_KQxz5nZYP0vfPY3HNxNEyw0Eaw@mail.gmail.com> <alpine.BSF.2.00.1206011435430.20357@wojtek.tensor.gdynia.pl>
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On Fri, 1 Jun 2012, Wojciech Puchar wrote: >>> Assuming that filesystem doesn't need offline filesystem check utility >>> because it "never crash" is funny. >>> >> >> zfs scrub...??? > > when starting means crash quickly? > Well.. no. > > Certainly with computers that never have hardware faults and assuming ZFS > doesn't have any software bugs you may be right. > > But in real world you will be hardly punished some day ;) > >> Additionally ZFS works directly at the block level of the HD meaning >> that it is slightly different to the 'normal' file systems in storing >> information and is also "self healing"...... > > doesn't other filesystem work on block level too? if no - then at what level? > If the OP really intended to stripe disks with no parity or mirror for ZFS , then that is probably a mistake. If the disks are /tmp, it might make sense to stripe disks without parity, but no need for ZFS. The OP did say "JBOD", which to me means that each disk is a separate disk partition with no striping or parity. Again, in that case I don't see any need for ZFS. As for ZFS being dangerous, we have a score of drive-years with no loss of data. The lack of fsck is considered in this intelligently written piece http://www.osnews.com/story/22423/Should_ZFS_Have_a_fsck_Tool_ The link to the emotional posting by Jeff Bomwick is broken, but the original is available at: http://mail.opensolaris.org/pipermail/zfs-discuss/2008-October/022324.html daniel feenberg nber
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