Q:
First SAN for my company and it is breaking the bank.
On my windows 2 cpu server with 20 disks, disk queue lengths exceed 40.
Windows perfmon and IOmeter benchmarks give me 0.9K IOPs for write and
2K for reads, 8K OLTP block size.
#disks : 20 : 36 GB, 15K rpm, U320 scsi with two dual channel
controllers with 256 MB cache each.
I am moving to a SAN. How can I get double my current IO performance. In
addition I also want a development/failover system with half the
performance of production.
production data size : 400 GB
development data size : 400 GB
temp table space : 100 GB each for production and develop.
Log file : 100 GB each for development and production.
In addition I have an application server which users upload data ( hence
mainly writes). files are large : 50-100MB in uploads.
All cases, 20 simultaneous access the SAN.
My solution : 28, 73 GB 15K for production + temp tablespace.
28, 73 GB 10K for development/temp table space.
4 disks 146 GB, 10K for logs ( prod and develop)
8 disks 146 GB, 10K for application server.
However the cost is 50% more than my budget.
Also included is a tape library and d2d backup to tape.
d2d window : 5 hrs.
d2t window : 10 hrs.
data size = 1 TB, compression ~ 20%.
Windows perfmon and IOmeter benchmarks give me 0.9K IOPs for write and
2K for reads, 8K OLTP block size.
#disks : 20 : 36 GB, 15K rpm, U320 scsi with two dual channel
controllers with 256 MB cache each.
I am moving to a SAN. How can I get double my current IO performance. In
addition I also want a development/failover system with half the
performance of production.
production data size : 400 GB
development data size : 400 GB
temp table space : 100 GB each for production and develop.
Log file : 100 GB each for development and production.
In addition I have an application server which users upload data ( hence
mainly writes). files are large : 50-100MB in uploads.
All cases, 20 simultaneous access the SAN.
My solution : 28, 73 GB 15K for production + temp tablespace.
28, 73 GB 10K for development/temp table space.
4 disks 146 GB, 10K for logs ( prod and develop)
8 disks 146 GB, 10K for application server.
However the cost is 50% more than my budget.
Also included is a tape library and d2d backup to tape.
d2d window : 5 hrs.
d2t window : 10 hrs.
data size = 1 TB, compression ~ 20%.
ASKED:
Oct 14 2004 3:05 PM GMT
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A:
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http://www.tomshardware.com/storage/20041006/index.html
It references a system with 32 drives. The savings would come from using serial ata instead of scsi. By having enough serial ata controller boards you can make up for the fact that individual throughput per board is less than it would be for scsi. Of course having lots of scsi boards would be even better but since cost is a factor...
