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40Tb Media Server Performance issues

Last response: in Systems
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January 17, 2011 2:18:05 PM

I have build a media Server with following specifications,
Gigabyte GA-H55-UD3h motherboard
Processor i5 680
Dell Perc 6i Raid Card
Chenbro Expander
20 * 2Tb Western Digital Caviar Green in Raid 6 configuration
I have set Intellipark to 300secs as discussed on some forums , After installing Server 2008 R2 I transferred 3.4Tb data on the raid setup and it took 3 days . (The maximum speed reached is 30Mbps).I have set the cache block size to 512mb . I believe the speed if extremely slow , I made sure the raid card was installed in the x16 pcie slot , I might be missing something , how can I increase the performance of this media server or is it bottle neck due to hardware itself.
January 17, 2011 2:33:32 PM

Maybe try a raid60 config. 20 drives in raid6 seems an awful lot, maybe your raid card can't handle it I'd say try a raid60 and see if it works better.
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January 17, 2011 5:51:56 PM

Somebody_007 said:
Maybe try a raid60 config. 20 drives in raid6 seems an awful lot, maybe your raid card can't handle it I'd say try a raid60 and see if it works better.


How would Raid 60 increase performance , and is there any limitation on number of drives in Raid 6 ? I thought Raid 6 is meant for larger Raids.
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January 17, 2011 5:59:18 PM

There's a lot of proccesing involved when having 20 drives in a raid6. A raid60 would only have half the drives in each raid6 which should be simpler.

And a raid60 is in theory twice as fast(in long reads and writes this should be in practice aswell) as a raid6(a fully functional full speed raid6 that is) because it's a raid6 and raid0 combined.

And yes raid6 is designed for a lot of drives but 20 really is a hell of a lot.
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January 17, 2011 8:34:40 PM

The media server would entertain files as big as 250gb to 500gb , now breaking the raid into smaller chunk would fail the purpose, but I am understanding the need for Raid 60 , but here I am confused with different variables like Cache sTripe Size/Block Size and Cluster Size , I am sure there is a relationship , for example , Bigger cache Stripe = Faster Raid ,
I will test Raid 60 on other machine in same configuration as see if there is significant difference in performance.
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January 18, 2011 4:09:13 AM

a raid60 is a single partition if thats what you meant. And as for the stripe size well the difference in stripe size I think for large file transfers bigger stripe size is better and for better response small stripe size is better.
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January 18, 2011 6:28:43 PM

looks pretty damn good doesn't it?
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January 18, 2011 7:25:08 PM

Well I am getting , 103MB/s at the moment , in real life scenario .
Need advice if this is good enough ,
Secondly Raid Allignment.. How to get it goinG?!
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