Date: Thu, 9 Jul 2009 14:34:35 +0200 From: "Patrick M. Hausen" <hausen@punkt.de> To: Nenhum_de_Nos <matheus@eternamente.info> Cc: freebsd-stable@freebsd.org Subject: Re: ZFS - thanks Message-ID: <20090709123434.GC46563@hugo10.ka.punkt.de> In-Reply-To: <73a41d4b72d62b0bfe3d0fb7206376a8.squirrel@cygnus.homeunix.com> References: <20090709112512.GA44158@hugo10.ka.punkt.de> <73a41d4b72d62b0bfe3d0fb7206376a8.squirrel@cygnus.homeunix.com>
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Hello, On Thu, Jul 09, 2009 at 09:17:35AM -0300, Nenhum_de_Nos wrote: > > So now we have this setup: > > > > NAME STATE READ WRITE CKSUM > > zfs ONLINE 0 0 0 > > raidz2 ONLINE 0 0 0 > > label/disk100 ONLINE 0 0 0 > > label/disk101 ONLINE 0 0 0 > > label/disk102 ONLINE 0 0 0 > > label/disk103 ONLINE 0 0 0 > > label/disk104 ONLINE 0 0 0 > > label/disk105 ONLINE 0 0 0 > > raidz2 ONLINE 0 0 0 > > label/disk106 ONLINE 0 0 0 > > label/disk107 ONLINE 0 0 0 > > label/disk108 ONLINE 0 0 0 > > label/disk109 ONLINE 0 0 0 > > label/disk110 ONLINE 0 0 0 > > label/disk111 ONLINE 0 0 0 > > > > which will get another enclosure with 6 750-GB-disks, soon. > I've always been curious about this. is said not good to have many disks > in one pool. ok then. but this layout you're using in here will have the > same effect as the twelve disks in only one pool ? (the space here is the > sum of both pools ?) It is not good to have too many disks in one group. What you see above is one pool with two raidz2 groups. As far as I understood the documentation after that helpful comment on this list, this is the recommended configuration. ------------------------------- http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide "The recommended number of disks per group is between 3 and 9. If you have more disks, use multiple groups." ------------------------------- The result is, of course, one big pool with lots of storage space, but the overhead necessary for redundancy is roughly twice that of my "dangerous" twelve-disk configuration. So I lost the equivalent of two disks or about 1 TB here. Fast, reliable, cheap - pick any two ;-) Kind regards, Patrick -- punkt.de GmbH * Kaiserallee 13a * 76133 Karlsruhe Tel. 0721 9109 0 * Fax 0721 9109 100 info@punkt.de http://www.punkt.de Gf: Jürgen Egeling AG Mannheim 108285
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