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Very poor RAID 0 performance

post #1 of 9
Thread Starter 
So, for a while I had my system on a single Seagate 7200.12 500GB and last night I cloned the drive onto a 1TB RAID 0 array. Doing that, I seem to have lost read/write sequential speeds. Random seems to be a little faster, but otherwise performance has gone down.
The system partitioned is short stroked @ 143GB for the OS partition - so it should be alot faster than 36mb write and 60mb read? It used to be ~120mb for both read/write.

The firmware on all the drives is the same and on the latest version. They were setup with AHCI before. Its setup with 64kb stripe blocks.
Edited by Dirtyworks - 2/15/11 at 10:04am
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post #2 of 9
Quote:
Originally Posted by Dirtyworks View Post
So, for a while I had my system on a single Seagate 7200.12 500GB and last night I cloned the drive onto a 1TB RAID 0 array. Doing that, I seem to have lost read/write sequential speeds. Random seems to be a little faster, but otherwise performance has gone down.
The system partitioned is short stroked @ 143GB for the OS partition - so it should be alot faster than 36mb write and 60mb read? It used to be ~120mb for both read/write.

The firmware on all the drives is the same and on the latest version. They were setup with AHCI before. Its setup with 64kb stripe blocks.
You say they were set up with AHCI? Do you mean you set up the RAID array in AHCI mode? Are you running a software RAID?

You are right it should be much faster. I would update the controller drivers/firmware and if you can, try a 128kb stripe. If you are managing a lot of large files, then a smaller stripe can result in drastically lower speeds.

Lastly, try and switch the ports you are operating off.

Hope this helps.
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post #3 of 9
Thread Starter 
The OS is in AHCI mode & I havent changed its Windows setting in the registry. Should I switch it back?
By that, I mean the entry at:
HKEYLOCALMACHINE/SYSTEM/CurrentControlSet/services/msahci
Start = 0

I'll try switching ports next - I already have the latest HDD firmware and BIOS for this board.
Also, I have done a complete defrag of the OS partition.

I guess what I need to know is if I'm missing something in configuring Windows 7 for the new setup - the same install that was on a single HDD has been cloned onto a RAID 0 array.

EDIT: Its a hardware RAID.

EDIT 2: I just tested read/write/random write speeds on the other partitions and saw the numbers I was expecting - upwards of 200mb read/185 write. However, the OS partition still has very poor performance.
Edited by Dirtyworks - 2/15/11 at 11:09am
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post #4 of 9
Quote:
Originally Posted by Dirtyworks View Post
The OS is in AHCI mode & I havent changed its Windows setting in the registry. Should I switch it back?
By that, I mean the entry at:
HKEYLOCALMACHINE/SYSTEM/CurrentControlSet/services/msahci
Start = 0

.
Don't mess with the registry in the OS, you are most likely overriding the RAID command from the BIOS. An interesting problem.
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post #5 of 9
Quote:
Originally Posted by Dirtyworks View Post
So, for a while I had my system on a single Seagate 7200.12 500GB and last night I cloned the drive onto a 1TB RAID 0 array. Doing that, I seem to have lost read/write sequential speeds. Random seems to be a little faster, but otherwise performance has gone down.
The system partitioned is short stroked @ 143GB for the OS partition - so it should be alot faster than 36mb write and 60mb read? It used to be ~120mb for both read/write.

The firmware on all the drives is the same and on the latest version. They were setup with AHCI before. Its setup with 64kb stripe blocks.


In my experiences, do not partition raid arrays. I feel that is a bit of your issue. Use the raid as a raw drive, and if you want use a seperate single drive for backups. You have offset the stripe size and I think thats why your os is not seeing the speeds you exptected.
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post #6 of 9
Sounds to me personally, like you accidentally setup your short stroke to be the inside of the platter instead of the outside.
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post #7 of 9
Thread Starter 
How can I tell whether the short stroke is setup right? Am I right in saying that, in Disk Management, the further left a partition is - the closer to the outside edge of the platter it is? Does this hold true with RAID 0?
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post #8 of 9
Quote:
Originally Posted by pioneerisloud View Post
Sounds to me personally, like you accidentally setup your short stroke to be the inside of the platter instead of the outside.
Yea but the thing is, this is done automatically from the BIOS. THe option to short stroke the inside of the platter is not there. I thought of this but, since today the process is automated i thought it wouldn't be a problem.

I would redo the whole thing and make sure you didn't accidentally override any commands being passed/select the wrong options.
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post #9 of 9
Thread Starter 
I can do a completely fresh install on the array, but I would really rather not - seeing as updates will take literally days. My internet speed is downright paltry (down to 15-20kb during the day).

Also, I've lost my CoD4 disc and its already installed lol

EDIT: Seeing as how I cloned it from my system drive, might it have written backwards onto the array? From the inside -> out?
Edited by Dirtyworks - 2/15/11 at 11:53am
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