45 Day SVC/V7000 Compression Evaluation
talor 27000411MV Visits (3247)
I wrote up an entry on SVC and V7000 compression recently. We updated to 6.4 code and the results were very impressive.
The link to it is here .
For those who have an SVC or V7000, there is a 45 day free of charge evaluation from IBM, where you can upgrade your V7000 or SVC to 6.4 code, add compressed volume copies and see what compression savings you will achieve, as well as be able to monitor performance to ensure that there is no perf
The 45 Day comp
There are some important limitations to take note of:
- No more than 200 compressed volumes per I/O group. In a 4 I/O group cluster thats a maximum of 800 volume.
- On SVC CF8 nodes, if your I/O group CPU Utilization is more than 25% (sustained), don't turn on compression.
- On V7000, if your I/O group CPU Utilization is more than 25% (sustained), don't turn on compression.
- On SVC CG8 nodes (the new 6 core nodes) if your CPU utilization is more than 50% (sustained), then don't turn on comp
If you don't already have an SVC or V7000 and are looking at a) getting one and b) using compression, there is a comprestimator tool that you can use.
The tool can also be used to perform an analysis of compression savings if you have SVC or V7000 and want to check the potential space savings before starting the evaluation.
The comprestimator is currently supported on Linux and ESXi and can be found here