[mythtv-users] OT Hardware RAID 5 Recommendations

James Oltman cnlibmyth at gmail.com
Tue Dec 12 22:13:58 UTC 2006


Blammo,

Just out of curiousity, what case are you storing your 12 drives in?  I've
been trying to find a good case for RAID and am not having any luck.
Thanks!

Jim

On 12/12/06, Blammo <blammo.doh at gmail.com> wrote:
>
> On 12/12/06, Paul Hamm <paulhamm at verizon.net> wrote:
> > Interesting ran this on my machine.  See the bottom for PC specs.  The
> > system is running 2 instances of FAH.  Not a very consistent test.
>
> Here's the specs on my main backend:
>
> tyan mpx dual motherboard, athlon 2400's, 2gig's ram, 3ware 9500S-12
> (256M cache) in PCI-X 66mhz slot, 11(+1)x160gig SATA drives, HW Raid5,
> XFS file system. Looks like this:
>
> /dev/sda1              1.6T   1.2T   427G  74% /raid
>
> write   1024    11.789  86.8
> read    1024    11.648  87.9
> write   2048    30.056  68.1
> read    2048    20.27   101.0
>
> (note, both raw & bonnie benchmarks were run while the system was
> fairly busy --- 2 tuners going, 1 remote frontend playing, 1 remote
> commercial flagging running)
>
> For raw disk performance, I find a much better tool to use is
> Bonnie++, which tests things like writes a second / reads a second,
> CPU load while this is happening, etc. I run it with the following
> arguments:
>
> [root at backend1 ~]# bonnie++ -d /raid/temp -u0 -g0 -n0 -s 2048
>
> Version  1.03       ------Sequential Output------ --Sequential Input-
> --Random-
>                     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
> --Seeks--
> Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec
> %CP  /sec %CP
> backend1         2G 37034  96 67223  34 39536  19 38805  94 140993  43
> 442.5   1
>
> Here's the very best part... I could have left those benchmarks
> running for 60 minutes straight (done it as a test) and I would not
> have dropped a video frame, chugged out a recording, or caused any
> instability in the box. The HW Raid card (true HW Raid, not psuedo
> rocket cards) was worth every penny.
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