Slow 3ware SATA RAID 9690

Here's a strange.

System Specs: ESXi 4.1 with updated oem.tgz for drivers of 3ware, Biostar TA890FXE, AMD Phenom II Black 3.2 ghz, 16 GB RAM, 3ware 9690SA-4i (with battery), Intel 1000GT, boot USB Flash 4 GB disk

I have two data warehouses using the same 1 TB SATA Samsung Spinpoint F3 1 TB disks:
(A) 3ware 9690 RAID-5, 4 discs, total capacity of 2.73 tb (2 to & Go 730 Lun, images of comments, primary storage)
(B) SATA AHCI, 2 disks total capacity 1.81 to (2 x 900 ~ to ISO and random storage Lun)

When the copy of the RAID to the standard SATA drives, it is doomed fast. But SATA in RAID, the speed is ridiculously slow. It seems to take easily 10 x as much time or more when copying very large files.

I noticed when I went to copy all my files and images of comments to a data store while I reformatted with a larger block size. Then the copy to roughly 400 GB from A to B, it took less than an hour, perhaps as little as 30 minutes. New B in A, it took 6 hours when I dropped.

In addition, I have a little bit of reference tool called Parkdale who made drive simple comparative analysis in Windows and have some real numbers to go with my comments in ESXi.

Option A with SATA RAID = 2.6 MB/s write, 73.7 MB/s reading (Win Server 2003)
Option B with SATA AHCI = 111.1 MB/s write, 108.1 MB/s Read (Win Server 2000)

There is certainly something weird here. Any ideas on how to test, what to look for, or what could be the problem?

You may need to activate the write cache. It wouldn't be activated without the battery. Some controllers to activate the cache because soon the battery is attached and responsible, but not all.

Tags: VMware

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