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__TanK__

SCSI 15k RAID0

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hey im new here and i got a prob. i have 2 seagate ultra 160 18gig 15k rpm drives in raid 0. each one is on its own channel. im using a mylex acceleRAID 352 with 64 MB on board cache. when i do HDtach or any other bench mark is say about 30MBps transfer and about 8 sec seek time. i was getting a lot better with a single drive. any help?

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Have you checked what mode your hdd's are running in? I suppose this would be displayed in your controller configuration.

also, some controllers have a setting for read/write cache. do you ahve this set to something strange? in a RAID 0 environment I would go for about 50/50 read/write.

I assume this effects both your reads and your writes?

sorry, im not a SCSI expert or anything, Im just trying to offer suggestsions

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i have read/write cache enabled and i did what mylex told me too do with the settings on the controller but still nothing. when installing stuff or unzipping stuff i do notice a performace increase but benchmarks wont show it. wierd...

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Two things:

TCD Labs have stated many times that HD-TACH is hit and miss with SCSI RAID configurations. I had the same concern prior to receiving this response from them.

Second, almost all RAID controllers that implement the I960 chipset are not high performers. In fact, the performance is poor.

Have you tried Iometer, or even Atto for example?

Also, with your present configuration (striped), the amount of cache is irrelevant.

i have read/write cache enabled and i did what mylex told me too do with the settings on the controller but still nothing. when installing stuff or unzipping stuff i do notice a performace increase but benchmarks wont show it. wierd...

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IOmeter is the only benchmark that can show what the controller and disks are doing. Forget HD Tach when benchmarking any kind of RAID.

Cheers!

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