[CentOS] 12-15 TB RAID storage recommendations

[David Miller]

On Tue, Apr 13, 2010 at 1:14 PM, Ryan Manikowski <ryan at devision.us> wrote:

>  On 4/13/2010 1:05 PM, Boris Epstein wrote:
>
> Hello listmates,
>
> I would like to build a 12-15 TB RAID 5 data server to run under
> ContOS. Any recommendations as far as hardware, configuration, etc?
>
> Thanks.
>
> Boris.
> _______________________________________________
> CentOS mailing listCentOS at centos.orghttp://lists.centos.org/mailman/listinfo/centos
>
>
> Chassis - CSE-836A-R1200B Supermicro SC836 A-R1200B - Rack-mountable - 3U -
> SATA/SAS - hot-swap - power supply 1200 Watt
>
> RAID Card - 3ware 9650SE-16ML-SGL 9650SE-16ML-SGL RAID 0/1/5/6/10/50 16CH
> SATA II PCIE 256MB ECC DDR2 - PCI Express x8 - Up to 300MBps - 4 x SATA x4
> Serial ATA/300 - Serial ATA
>
> BBU Module for RAID card - 3ware BBU-MODULE-03
>
>
> Pick the cpu(s) and motherboard to fit the chassis. Obviously go with ECC
> ram and ONLY enterprise grade hard drives. To ensure compatibility check
> with 3ware to see which drives they recommend. Areca RAID cards will get you
> a little better performance but the module for the 9650SE series of 3ware
> cards is included with the Centos kernel. Getting the Areca driver going is
> a bit more work, but nothing that would be considered a huge hurdle for a
> competent sysadmin. Also, if you're looking for advice on Areca products
> call their Tekram contact in the USA. Their other distributors have been
> less than stellar on answering pre-sales questions.
>
>
> --
> 	 Ryan Manikowski
>
>
> ]] Devision Media Services LLC [[
> 	 www.devision.us
>  ryan at devision.us | 716.771.2282
>
>
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>
Ryan's hardware recommendations are good.  But I wouldn't run a RAID5 volume
that large, software or hardware.  It's just too risky as rebuilds will take
days and the chances of hitting a non recoverable read error would be near
100% on a volume that size.

Either run multiple smaller RAID5's and use LVM to manage the volumes which
the OS will use or choose a better RAID layout.  RAID6 or RAID10 are much
better choices these days.
--
David
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