Date: Fri, 28 Nov 2008 18:07:35 +0100 (CET) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Valentin Bud <valentin.bud@gmail.com> Cc: freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: 5 TB server Message-ID: <20081128180448.Y5415@wojtek.tensor.gdynia.pl> In-Reply-To: <139b44430811280640g69d4843bq276b9aa2c8aa725d@mail.gmail.com> References: <139b44430811280548x36915301i766bfb15f162c8ca@mail.gmail.com> <20081128145705.A5057@wojtek.tensor.gdynia.pl> <139b44430811280640g69d4843bq276b9aa2c8aa725d@mail.gmail.com>
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> tests with ZFS and > some with UFS. On the ZFS side the most attractive thing is the backup > and of course > the easiness of administration. don't get fooled. >> >> if i were you i would get any motherboard with 8 SATA ports, up to 8 1TB >> disks, cheapest available CPU, good PCIe gigabit cards or two. > > 8x1TB with some mirroring + striping would equal how much in terms of > available space? Sorry i have to do my homework regarding RAID :|. gstripe of 4 gmirrors will give 4TB graid3 or graid5 will give 7TB, but much lower I/O performance (same with ZFS raidz). if you mainly read/write large files it's OK. With graid5 read performance is near gstripe only writes are slow, with graid3 or ZFS raidz both are slow. To be exact - single reads are not slow, but I/O capacity is low so under concurrent reads it will be very slow.
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