Unsolved
This post is more than 5 years old
1 Message
0
1098
June 3rd, 2015 02:00
How to effectively measure VMAX Performance?
Hi,
I'm fairly new to administering VMAX storage so please bare with me!
My team have been asked to generate some traffic over our SAN (VMAX20K , FCoE to Cisco UCS). At present, we have a virtual machine on a host dedicated to that VM. We are presenting an RDM 5TB disk from our VMAX to this VM using physical compatibility within VMware.
The VM specification is:
- 16 vCPU
- 1TB RAM
- 5TB Disk NTFS formatted.
I am running IOMeter on the VM, with the following settings to try and simulate a rough SQL workload:
- 100% Random distribution
- 34% write, 66% read
- 16K block size
- 32 Outstanding I/O's per target.
At present, when I run the test I'm only seeing ~12,000 total I/Os per Second reported through IO Meter. I'm not sure if this is a great number or not, my gut feeling is that it isn't. Viewing the performance on Unisphere in real time is showing around 13,600 host IOs/sec.
Our thin pool for this disk FC disk (RAID5 - 7+1) which is made up of 24 * 550GB 15k RPM disks.
Is there anything I'm missing? This is a bit of a novice question, so apologies for that. If any further information is needed I'd be happy to provide it!
Thanks,
Ryan
0 events found
Martin0904
30 Posts
0
July 23rd, 2015 02:00
Let´s do some simple Math........ 24x15K RPM Drives in the Backend so we have 24x180 IOPS (4320) roughly........ then we need to take care of the Write Penalty of Raid5 which is 4 so we have much lesser Front End IOPS than 4320.
so i think 12.000 IOPS with a good Response time are not so bad...... but it depends on your IOMETER Test, how big is the IOMETER Test File etc..... i think most of your Performance Test is run in the VMAX Cache.
Some Questions..... how much IOPS at which Response Time did your Application need?