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 Post subject: Super Slow RAID 0
PostPosted: Tue Jul 09, 2013 11:57 am 
8086
8086

Joined: Mon Nov 05, 2012 8:19 pm
Posts: 4
Hi all,
I'm putting together a large file server for medium-term backups of scientific data.

Here's the specs:
24x WD30EZRX 3TB 64MB Cache Hard Drives (145MB/s sustained as stated by WD's website)
LSI 3ware 9750-24i4e raid controller
2x AMD Opteron 246 2GHz CPUs
3Gb DDR ram
ST3750640AS 750Gb boot drive
(Not sure what mobo)
850W PSU
Radeon 7000 64mb DDR Graphics Card
and Ubuntu 12.04.2 32-bit

RAID specs:
Stripe: 256k
Write Cache: Enabled
Read Cache: Intelligent
StorSave Profile: Performance
Auto-Verify: Enabled

Currently, I am getting best case speeds of ~300Mb/s with Mb and larger files. This kind of speed is all nice and great, but I really need above a Gb/s as I will be moving Tb's of data around.

I have set a larger stripe (using: blockdev --setra) as I am working with rather large files, but this results is only around a 10% increase.

DISCLAIMER: I am not, by any means, a Linux expert. If you have some tips that would help me here, please post! Thanks!


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 Post subject: Re: Super Slow RAID 0
PostPosted: Tue Jul 09, 2013 3:58 pm 
Smithfield
Smithfield

Joined: Sun Jun 18, 2006 7:37 pm
Posts: 5459
I'm going to play dumb here for a moment...

The 24x hard drives are not all RAIDed together yes? Because if it was just an array of RAID0x12 hard drives, then you're not going to top out more than what you're seeing.

Also RAID0 is a terrible choice for backup of any sort, especially the data you're storing. If any one of those drives goes kaput, you lose it all. You should do RAID1 or RAID5


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 Post subject: Re: Super Slow RAID 0
PostPosted: Fri Jul 12, 2013 10:53 am 
Bitchin' Fast 3D Z8000
Bitchin' Fast 3D Z8000
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Joined: Wed Jun 16, 2004 5:29 pm
Posts: 6328
Location: Far away from you
Raid 0 may get you the speed bumps you're looking for, but no not the redundancy.

With that may drives, it sounds like you're needing to setup Raid 10 or raid 6 and admittedly, for a $2000 card, I'd probably be giving LSI a buzz.


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 Post subject: Re: Super Slow RAID 0
PostPosted: Thu Aug 15, 2013 7:20 pm 
8086
8086

Joined: Mon Nov 05, 2012 8:19 pm
Posts: 4
Well, the purpose of the array is just to be moving data around before it is deleted from an hard drive archive (as the tape archive is down alot.)
However, I have tried some RAID 6 and get speeds that are half of what I get with the RAID 0 and about 10 times less than what I should be seeing.


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