Date: Tue, 10 Jul 2012 21:51:59 -0400 From: Rich <rercola@pha.jhu.edu> To: Bob Friesenhahn <bfriesen@simple.dallas.tx.us> Cc: Jason Usher <jusher71@yahoo.com>, freebsd-fs@freebsd.org Subject: Re: chaining JBOD chassic to server ... why am I scared ? (ZFS) Message-ID: <CAOeNLurLx8YdVdiob=t4-4geyuTY6TAov7R6%2BngfE-LjH2Zfew@mail.gmail.com> In-Reply-To: <alpine.GSO.2.01.1207102010300.27589@freddy.simplesystems.org> References: <1341946657.18535.YahooMailClassic@web122505.mail.ne1.yahoo.com> <alpine.GSO.2.01.1207102010300.27589@freddy.simplesystems.org>
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*waves with his 360 disks attached to single head node* c.f. http://www.senecadata.com/products/vendor-partners/LSI/PDFs/Seneca-PSC-LSI.pdf (which is not me, but is relevant) - Rich On Tue, Jul 10, 2012 at 9:19 PM, Bob Friesenhahn <bfriesen@simple.dallas.tx.us> wrote: > On Tue, 10 Jul 2012, Jason Usher wrote: >> >> >> But this scares me ... >> >> - two different power sources - so the "head unit" can lose power >> independent of the JBOD device ... how well does that turn out ? > > > Most of your concerns are things which have been normal for fiber channel > based arrays for quite a few years already. SAS cables are shorter so there > is a better chance that everything is on the same power and in the same > rack. > >> From my limited experience, getting everything on the same power helps > > with managing things. > > >> Just how well does ZFS v28 deal with these kind of situations, and do I >> have a good reason to be awfully shy about doing this ? > > > I have been on zfs mailing lists for many years and few of the issues > reported have been due to ZFS. Usually problems are due to failing memory, > bad cables, and SATA drives on SAS expanders. SAS disks work better in > large arrays. > > There have been people running several hundred disks without problem. > > Bob > -- > Bob Friesenhahn > bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ > GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ > > _______________________________________________ > freebsd-fs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org"
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