IDE RAID Performance

Posted on 2003-02-21
Medium Priority
Last Modified: 2013-11-14
Has anyone any experience with IDE RAID?  I have a Promise ATA133 RAID controller built onto my mobo and currentyl have 2*Maxtor 60gb ATA133 7200rpm drives connected in RAID 0 (striping)

I want to know if my disk access/transfer speeds will increase if I change this to 4 * 60gb Maxtors (all the same model) in Raid 0?
Question by:dean_dodd
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Expert Comment

ID: 7992527
In theory, "yes".
In my opinion, "No" because your controller raid is an EIDE peripheral. This type of interface needs a lot of CPU time ...
You can benchmarch your system with hdtach or Sisoft Sandra software.

With a professionnal raid controller with a lot of cache (128 or 256 Mo), ultra SCSI 160 or 320 interface, and 15000 rpm scsi harddisks  the answer will be yes.
LVL 13

Accepted Solution

CRAK earned 90 total points
ID: 7992619
First make sure the Mobo Promise controller is capable of using a 4 drive array....
The one on my Asus A7V333 only uses 2 in an array! It does control 4 drives, but the last two would probably be accessed as separate drives.

Expert Comment

ID: 7992741
Here you can find a good article about (EIDE) Raid :
LVL 12

Expert Comment

ID: 7993177
The transfer speed ought to improve, yes, but the disk access time isn't likely to get any better--after all, all that's going to happen is that four different drives all have to seek to the appropriate place rather than a single drive doing it, and I can't see this being any faster. (In fact, it may be slower because you're reduced to lowest common denominator, e.g. the whole array will have a disk access time equivalent to the slowest drive in it).

Given the huge extra chance of failure you're introducing by putting four drives in a stripe--don't forget, any one of those drives failing will take down the entire array--I would say this simply isn't worth the time and trouble.

Author Comment

ID: 7996110
Thanks to all for your comments especially CRAK - My RAID controller will only support the Master hard disk's on the IDE channels in a RAID configuration, for this I am awarding him the point's as he saved me £150 and a lot of time!


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