How to measure i/o throughput to a VA7410?

[Ron Levy]

We have a VA7410 direct-connected to two rp5450 machines via the 2 GB fibre-channel ports.

We are currently looking at upgrading, but to do that, we'd like to know how much data is crossing that link, is it saturated or not, what are our requirements for when we buy a new SAN device.
How can we get a reading of how much data crosses that fibre cable?

Thanks,
Ron Levy
Lion MTS

[Steven E. Protter]

Shalom Ron,

From the OS side:
http://www.hpux.ws/system.perf.sh

From the VA side I'm not aware of any utilities, but perhaps the control console or HP service can provide diagnostics.

SEP

[Sandman!]

Use the device special file of any one of your VA7410 mounted filesystems and run dd on it, for ex. if /dev/vgSAN/lvol1 is a mounted filesystem and all its PVs are on VA7410 then:

# time dd if=/dev/vgSAN/lvol1 of=/dev/null bs=1024k count=100

Roughly your throughput would be (100 Mbytes / elapsed time) you get from running the command above.

~hope it helps

[Adisuria Wangsadinata_1]

Hi Ron Levy,

I'm agreed with SEP, looks like there's no tools from VA7410 to analyse this portion but with performance analysis tools on system side, you can get the data that you want.

I'm using MWA (measureware agent) & Perfview to gather those information, so I can get the PHYS_IO_RATE, REQUEST_QUEUE, AVG_SERVICE_TIME from the disks on my systems (on your case is the VA7410).

You can use SEP's link to get the script to capture the information on the system (using the basic HP-UX command, eg. sar).

Hope this information can help.

Cheers,
AW