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RAID 0 Extremely Slow

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Last Modified: 2016-12-08
Recently my RAID 0 setup has been extremely slow, with read/write speeds averaging about 2MB/sec. It's been causing problems in a whole lot of applications. I've tried reinstalling RAID drivers, enabling/disabling read/write cache, enabling/disabling RAID in bios, and defragmenting the whole thing. What's going on? How can I run diagnostics?

I am testing read/write speeds with Bart Stuff Test v5. When I test with HDTach, I get an average of 87MB/sec. Why the huge difference?

There is only one idea I have as to what could have caused this; I tried to defragment the RAID disk a while ago, just because I had heard it was a good idea. I used O&O Defrag's "COMPLETE/Access" method of defragmentation, but after leaving it alone for 6 hours and getting 1% progress, I cancelled it.

After getting issues, I went back and let it complete the whole process using the "STEALTH" method, but the slow speeds persist.

For comparison, the IDE drive my system is running off of is averaging about 24MB/sec read/write.  

Windows XP 64-bit
4xWestern Digital 250GB SATA in RAID 0 configuration
Tyan Thunder K8WE S2895 Motherboard, Dual Opteron 270
4 GB RAM

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Commented:
is it still rebuilding

Author

Commented:
Don't know what that means. How can one tell?

Commented:
are all the drives running and its led will be on all the time

how old are your western digital drives as the could be stating to fail which gives major problems to the raid controller
normal hdd's where not designed for raid really
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I forgot to tell you, in striping mode, if either drive fails, you lose everything.

SO, I highly recommend you backup the entire thing immediately.
andyalderretired saggar maker
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Commented:
>enabling/disabling RAID in bios...

Methinks it is RAID 1, not RAID 0 since it wouldn't boot if you disabled RAID in BIOS with RAID 0.

Author

Commented:
It's not my boot drive.

Author

Commented:
I suppose if no one has any more suggestions than I guess a drive must indeed be failing. Unfortunately it's a 4 disk RAID so I have to replace all four of them.
andyalderretired saggar maker
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Commented:
Well then, you wouldn't be able to access it f it was RAID 0 with RAID disabled.

Author

Commented:
That's correct. I said I had tried disabling and then re-enabling it again as a way of "cycling" it.
andyalderretired saggar maker
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Commented:
I don't see why you have to replace all four,

back it up, wipe the disk config and set each one as a seperate disk, test each one and you should identify the faulty one. Then re-build using a new disk to replace the failed one.

Author

Commented:
Yep, turned out to be a faulty drive. Replaced it, and everything is better.
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