[Veritas-bu] Scratch Pool Usage
2005-05-04 09:45:29
I'd have to say it depends on the system, and what you get in testing.
I never implement something without testing the options first.
In my case, Exchange for example, has 4 Storage groups....totalling ~600
Gig.
SG1 and SG3 are on a single RAID5 array, and SG2 and SG4 are on another
RAID5 array.
Here's what I found in testing:
One SG to one drive: ~20 Mbytes/sec
Two SG (from same RAID array) to one drive: ~17-18 Mbytes/sec per SG
Once the other two SGs were added in, the performance dropped...likely
due to the network load.....the drives were no longer the bottleneck.
Running all 4 SGs at once to 4 drives, performance was down to about 13
Mbytes per sec.....
Running 4 SGs in 4 streams, mpx to 2 drives I was getting 16-17
Mbytes/sec per stream.
It would seem running to 4 drives was providing insufficient data to
each drive, so they weren't streaming....MPXing to 2 per drive actually
bumped performance UP!!!
Paul
> -----Original Message-----
> From: veritas-bu-admin AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of
> Bobby Williams
> Sent: May 4, 2005 8:34 AM
> To: Larsen, Errin M HMMA/IT; veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] Scratch Pool Usage
>
>
> My opinion on this (and I have multiple systems over 500GB)
> is to not do MPX on this Big system, but use the multiple
> data streams.
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- [Veritas-bu] Scratch Pool Usage, (continued)
- [Veritas-bu] Scratch Pool Usage, Larsen, Errin M HMMA/IT
- [Veritas-bu] Scratch Pool Usage, Paul Keating
- [Veritas-bu] Scratch Pool Usage, Larsen, Errin M HMMA/IT
- [Veritas-bu] Scratch Pool Usage, Paul Keating
- [Veritas-bu] Scratch Pool Usage, Bobby Williams
- [Veritas-bu] Scratch Pool Usage, Larsen, Errin M HMMA/IT
- [Veritas-bu] Scratch Pool Usage, Eric Ljungblad
- [Veritas-bu] Scratch Pool Usage, Paul Keating
- [Veritas-bu] Scratch Pool Usage, Bobby Williams
- [Veritas-bu] Scratch Pool Usage,
Paul Keating <=
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