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Raid 5 HDtune performance

post #1 of 6
Thread Starter 
I recently built a 5 harddrive HW RAID 5 with the Lian li EX-50b esata enclosure based on JMicron939 HW controller.

The harddrives are: 2x 2tb Samsung 204UI, 2x 2tb Samsung 203WI, 1x 2tb WD WD20EARS

Are these good Read and Write performances: Write performance:



Read performance:
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post #2 of 6
Not really great since I get 120Mb read on my samsung F3.

RAID5 array's aren't really designed for performance. Also, you're running different makes and models which isn't great, you really want to have the same drives for any raid array.

Comps
post #3 of 6
Your read should definitely be a lot higher than that.
Not sure what's up with that controller..
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post #4 of 6
I doubt it's the controller, it's more likely going to be the fact he's using different disks. They might have different RPM's etc etc
post #5 of 6
Even a 6x 5400 RPM array could net more than 100 MB/sec.
Here's a mixed disk 6x 750 GB mdadm RAID5 array, for reference:
Quote:
beers@fs:~$ sudo hdparm -t /dev/md0

/dev/md0:
Timing buffered disk reads: 1068 MB in 3.00 seconds = 355.58 MB/sec
The controller on your enclosure itself is definitely gimping your array.
That's about the best you can hope for, I'd imagine..

Edit: As far as general usability, it's fine.
Edited by beers - 5/3/11 at 6:48pm
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post #6 of 6
Thread Starter 
Quote:
Originally Posted by beers View Post
Even a 6x 5400 RPM array could net more than 100 MB/sec.
Here's a mixed disk 6x 750 GB mdadm RAID5 array, for reference:


The controller on your enclosure itself is definitely gimping your array.
That's about the best you can hope for, I'd imagine..

Edit: As far as general usability, it's fine.
So why I get so low?

can it have to do with esata?
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