[mythtv-users] OT Hardware RAID 5 Recommendations
Blammo
blammo.doh at gmail.com
Tue Dec 12 21:40:55 UTC 2006
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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