ARDiver86 wrote:
CPU usage is sitting around 60% right now but the performance seems to have stablized. We are using one CPG with dedup and compression on version 3.3.1.410 (MU2) (no support so can't get firmware files to upgrade).
We actually only have 3 ports available to the SAN and right now all three are under 10% throughput rate. When this picture was taken all three were around 60% to 80% utilized. We only have four Elatsic HOT nodes on this device and each node is pushing around 1,000 to 2,500 IO/sec based on the performance graphs in SSMC. I think something was going on with my Elastic cluster because it eventually stopped working and all IOPS just died (the cluster died).
Now that the cluster is back online and functioning performance seems much better but I still see that the service time on each volume is around 20ms read and less than 1ms write. This could be additional latency because they are virtual machines
using fiber channel passthrough in Hyper-V. The two other volumes presented to the hyper-v nodes which are just running the operating system (not much IO) are only showing less than 2ms read/write with 20 IO/sec.
Here is statvv:
Here is statvlun:
It appears statvv is high but statvlun is low. I took a look at the CPG and it appears it is configured for RAID 5 with a set size of 7 data 1 parity
I think you are seeing the expected performance of the array. WIth 60% CPU, there is probably a couple of cores that are 100%.
Also, you'll never get 100% utilization of all host ports on the system. A 8200 system can have 6x 16Gb FC ports per node, so 12x16 Gb = 192 Gbit = ~24GB/s.....
What is interessting is that you have 1,9GB/s on backend traffic and 443MB/s frontend... What is the read/write ratio here? As for latency they are high (probably due to load)... but large IO size isn't helping.....
Just asking, what is the dedupe and compression rate on the system? If it is low, you would gain performance by converting the volumes to thin.