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SAN Performance is killing me!

longblock454

longblock454

2[H]4U
Joined
Nov 28, 2004
Messages
2,906
Running www.iometer.org benchmark:

Parameters:

Max Disk Size = 1024000 Sectors
Access Specification = Default
Set the Results Display update frequency to ~ 2 seconds

Run the test, it takes a bit to generate the 512MB file. Running Win2003 Server, over Qlogic 2GBps Fiber Channel to XioTech Raid 10 40+ spindle SAN.

I get about 150 Total IO/sec at about 0.30MB/sec. SAN idle!

On a RAID 10 Netware Box, going to the same SAM, I get about 2700IO/sec at 5MB/sec over gigaE!

Anyone else with a fast array please bench and post your results from Windoze?

Any ideas on increasing performance? I've checked for errors/runts/grunts/etc through the Fiber channel fabric, no problems. SAN shows no errors....

Any chance Netware is caching? Or are the results really that much faster?
 
longblock454 said:
All other IOmeter parameters were unchanged from default. I only changed the ones listed.

Thanks
Click to expand...



Try using 32 out standing IO's that should really increase the performance. Also you will need to change the transfer size. I think IOMeter starts with 2KB by default I would change it to 512KB. I am able to easily max out a 2gb fibre link with only a direct attached 12 drive box hell I can max out a 4gb fibre link with that. Should have no problem at all maxing out the fibre. Something is definently not right here.
 
draksia said:
Try using 32 out standing IO's that should really increase the performance. Also you will need to change the transfer size. I think IOMeter starts with 2KB by default I would change it to 512KB. I am able to easily max out a 2gb fibre link with only a direct attached 12 drive box hell I can max out a 4gb fibre link with that. Should have no problem at all maxing out the fibre. Something is definently not right here.
Click to expand...

Yep, i can hit the ceiling if I make those changes. But i'm attempting to simulate OLTP (On-Line Transaction Processing), I believe that is what the Default Access Specification is simulating.

Root goal: Improve SQL performance on this box, currently its against the disk. Based on the origional IO/MB/sec results I believe there is more to be had, just can't find it.

Any suggestions?
 
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