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Interesting performance issue with Raid 0

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Morpherios

Registered
Joined
Sep 27, 2003
I have an interesting situation going on here and I'm wondering if anyone can give me some idea as to what to do to remedy it or tell me why it's happening.

I have a P4 3.0 ghz, 1 gb kingston pc2700 ram, with a Soyo Dragon 2 Plat motherboard, and I'm using two 120 gigabyte Maxtor ATA 120 gig 8 meg cache drives in a RAID 0 array. About 1 week ago I had bench'd it repeatedly with Sandra and got an average transfer rate of about 65 mb/sec. The next day I went out and bought a DVD burner, and set it up on my system. The configuration on the system is like this:

IDE 1 Master: Maxtor 40 GB hdd (basically a spare "junk" drive)
IDE 1 Slave : DVD Burner
IDE 2 Master: CDRW
IDE 2 Slave : DVD ROM drive

IDE 3: One 120 gb
IDE 4: Second 120 gb

Prior to the DVD burner, the Maxtor 40 GB was the only one on it's chain, DVD Burner obviously was added as a slave.

After the DVD burner was installed I noticed a bit of sluggish performance. Mainly when opening My Computer or Explorer while it was attempting to show the drives. What really got me though was when I ran Sandra afterwards, and got an average transfer rate of 43 mb/sec. No clue why it dropped like that, I defragged with no change (not that I expected it to), and couldn't really come up with anything else to try except for removing the last change I made.

I ran like that for a while and eventually just knowing the transfer rate was that much lower got to me, so I shut the system down, pulled that IDE cable off the board (cutting off both the 40 and the dvd burner) and ran Sandra a few times again. Average transfer rate at about 52 mb/sec. Ok, so it's not quite what it was but there's some progress. Deciding to shut down and put the cable back on the system and go hunt for answers, I shut down, reattach cable, boot up and just for the sake of trying it I run sandra again. Transfer rate avg was 52 mb/sec.

Ok, so it dropped sharply when the drive was put on, it went up half what it lost when the drive was yanked, but didn't lose what it gained when put back on.

Is there something I'm missing here? Should it be doing this for a reason I'm not aware of? Is there something I've done wrong? Any help is appreciated.

BTW, I'm using the most up to date version of the Bios, it did not fix the issue.
 
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