[CentOS] Calling All FS Fanatics

chrism at imntv.com chrism at imntv.com
Tue Oct 3 19:10:57 UTC 2006


Kirk Bocek wrote:
>> Joshua Baker-LePain wrote:
>> I seem to have maxed out at approximately 275mb/sec on writes and about
>> 200mb/sec on reads with the following configuration:
>>
>> Dual opteron 275's
>> 2gb RAM (4 x 512mb)
>> 3Ware 9550SX w/8 ports
>> 8 x 750gig barracudas (RAID 0)
>> 2 x 80gig seagates for the OS
>> ncq off
>> 9550 set to "performance" rather than "balanced" on the storsave or
>> whatever that parameter was called
>> ext3 file system with "blockdev --setra 16384"  <-- great find!
>> CentOS 4.4 64-bit
>>
>> I'm too chicken/paranoid/etc to fiddle with XFS since I'm cpu bound most
>> of the time (encoding/fondling uncompressed video).  At some point, I'll
>> switch the array over to RAID5 so there is some sort of safety net, but
>> right now I'm working with play data so it doesn't really matter.
>>     
>
> 3Ware's site seems to point to 300+MB/Sec with 8 disks so it sounds like
> you're close. Read speed seems low. As I said, enabling memory
> interleaving on my motherboard and setting the drives to 3GB/Sec made a
> big difference.
>
> 8x750 Gig! I still remember when a friend bought his first 512MB drive and
> I asked him what he was going to do with all that space! Of course that
> was long before any thought of video on a PC...
>   

I just updated with a newer motherboard bios and enabled memory 
interleaving and now I'm getting 201mb/sec for writes and 317mb/sec for 
reads.  I think that's definitely fast enough for me to stop fiddling 
with it.  :-)

Cheers,



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