Date: Fri, 08 Aug 2008 06:32:00 +0900 From: Randy Bush <randy@psg.com> To: Matt Simerson <matt@corp.spry.com> Cc: freebsd-fs@freebsd.org Subject: medium sized zfs nfs server (was: zpool degraded - 'UNAVAIL cannot open' functioning drive) Message-ID: <489B69D0.4050303@psg.com> In-Reply-To: <135AC59E-45A2-4254-AC2C-43D3BB60EE39@corp.spry.com> References: <6c3c36d00808062109y6ae176a0ha055129392b00542@mail.gmail.com> <20080807044759.GA7505@eos.sc1.parodius.com> <6c3c36d00808062212y4e9a1464i48e146e84725a36e@mail.gmail.com> <6c3c36d00808062235v5cbb4470v990b76d569f85614@mail.gmail.com> <20080807055841.GB9735@eos.sc1.parodius.com> <489A9739.20707@yandex.ru> <20080807071434.GA15465@eos.sc1.parodius.com> <489AA414.5080709@psg.com> <135AC59E-45A2-4254-AC2C-43D3BB60EE39@corp.spry.com>
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[ i am a internet / research / software guy, and this pee cee hardware
stuff scares the <bleep> outta me. so i am seriously desperate with
these questions and *highly* appreciative of the responses ]
>> [0] need to build a 20tb raidz2 system, kind of an nfs store to serve
>> some data collertor(s) and compute engine(s). trying to sort out disk
>> controller and 10ge card decisions and the hardware / freebsd support
>> space is complex.
>
> SuperMicro 24 disk chassis (CSE-846TQ-R900B)
> 24 1TB SATA disks
> (2) Areca 1231ML controllers with BBWC
thank you. and the 10gige card? thinking copper cx as it's just
between two or three hosts in the rack.
> Two RAID 5 partitions with no hot-spare disks will net you 19TB of
> formatted storage. If you ZFS stripe across the two RAID arrays, you'll
> get decent performance. If your data is compressible, enabling file
> system compression will easily store the 20TB you need.
actually, i was thinking what i hope is a bit more conservatively
(except for the last line)
o exactly that chassis with a mobo with 8gb ram and > 2 cores
o the goal is 20tb of spindles to get 10tb of data store
[ may even wait some weeks for the 1.5tb drives, oink oink ]
o two hot spare drives as this is in a remote rack
o no hardware raid, have been burned by 3ware, ...
o zfs's raidz2
o (gasp!) -current for the zfs fixes
whack me harder with the clue bat, please
randy
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