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%.
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