Volume Spanning and Performance
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Volume Spanning and Performance

 
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Michael Kenny
Guest
Posted: Fri Aug 26, 2005 4:16 pm    Post subject: Volume Spanning and Performance Reply with quote
Can anyone comment or point out any test data on the effect of volume
spanning and performance?

Is there performance degradation due to spanning one logical volume over two
RAID 5 arrays vs. creating a single volume on each array? In either case the
array is controlled by a single channel of a dual channel SCSI controller.

I understand Windows will fill up one array before moving on to the next.
Assuming the drives get pretty full and are hit pretty hard (These are
hosting very busy and very large Domino databases) will either configuration
improve or degrade system performance?

I can find nothing indicating this is good, bad or nutral, and I could
really use some guidance on this.

Thanks,

Mike
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Pat [MSFT]
Guest
Posted: Thu Sep 01, 2005 10:10 pm    Post subject: Re: Volume Spanning and Performance Reply with quote
Performance is less of a concern than the potential for data loss. When you
use a spanned volume if you lose either - you lose both. A single volume on
each array would also perform better than spanning the two.

Pat

"Michael Kenny" <Michael Kenny@discussions.microsoft.com> wrote in message
news:16DE2307-BE04-4B20-B9A4-72008FA07969@microsoft.com...
Quote:
Can anyone comment or point out any test data on the effect of volume
spanning and performance?

Is there performance degradation due to spanning one logical volume over
two
RAID 5 arrays vs. creating a single volume on each array? In either case
the
array is controlled by a single channel of a dual channel SCSI controller.

I understand Windows will fill up one array before moving on to the next.
Assuming the drives get pretty full and are hit pretty hard (These are
hosting very busy and very large Domino databases) will either
configuration
improve or degrade system performance?

I can find nothing indicating this is good, bad or nutral, and I could
really use some guidance on this.

Thanks,

Mike
Back to top
 
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