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5283
September 16th, 2010 23:00
PERC 6/i SATA performance issues
I've got a PERC 6/i that I'm having some issues with on SATA drives. I thought maybe the problem was related to firmware, however I can't seem to flash to newer firmware (I started another thread about that).
Anyway, here's my problem: I have 8 Seagate Savvio 10k.2 73 GB SAS drives that I plugged into this controller, and those drives will deliver upwards of 700 MB/s in RAID 0, upwards of 600 MB/s in RAID 5...in short, pretty much what you would expect, performance-wise.
I have 8 Hitachi 7K500 500 GB SATA II drives that I plugged into this same controller, and no matter what RAID configuration I use, no matter what stripe size I use, I seem to be limited to about 100 MB/s. I know it's not a throughput problem with the controller, because it can easily handle the Savvios. I also know it's not a problem with the drive throughput, because those same drives plugged into my motherboard's LSI1068 SAS HBA will deliver upwards of 700 MB/s in RAID 0, and 600 MB/s in RAID 5. Only problem is, the LSI1068 is a software RAID, not a hardware RAID.
Anyone have any thoughts, suggestions, ideas? I'm flummoxed.
System is running Gentoo Linux, 2.6.34 kernel. The PERC 6/i is currently on 6.1.1-0047 firmware, however flashing to the LSI 11.0.1-0034 firmware didn't change the problem.
Using a SuperMicro X8DA3 motherboard.
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gizmo4321
5 Posts
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September 17th, 2010 11:00
Ok, so reybeast1 helped me get the firmware problem sorted; I am now running the 6.2.0-0013.
This improved my problem a little but I still have substantially the same issue.
A little more info:
When I run:
hdparm -t /dev/sda
It looks like the controller polls each of the drives in turn. This polling takes about a second for all 8 drives. Then I get the rapidly flickering LED pattern as it reads the drives.
I can't help the feeling that there's some simple setting here that I'm overlooking or not making, which will sort all of this out for me, but I'm lost as to what that setting might be.