Slow disk throughput

All,

I have an HP ML150 G5 and I have set up a mirrored 1.5 tb drive array. I have been having trouble with Linux throwing the drive into read only mode when it is under aload (oracle backup). I think the issue has to do with slow performance on the drive. I ran dd to benchmark write performance and got this:

writing 10MB: 69MB/s
writing 100MB: 20MB/s
writing 1000MB: 12MB/s

My question is, is this normal for a Seagate Barracudda 7200.11 drive? And, is there anything I can to to tune this array? I am not a Linux guru. Just trying to feel my way through this. Thanks.
LinuxAtWorkAsked:
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rindiConnect With a Mentor Commented:
The disk manufacturer's web-site usuallysplits them up into sections. Like desktop grade, enterprise grade etc.
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rindiCommented:
Those disks are desktop drives, not enterprise grade drives. NEVER use desktop grade drives in a RAID array. You'll only have problems.

Replace them with enterprise class drives and your issues should disappear. Probably best is to get drives certified for your server directly from HP.
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LinuxAtWorkAuthor Commented:
How do I know a given drive is "enterprise"? Is there something specific I should look for in a make/model/or spec?
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