MammaGutt wrote:
Getting anything out of a visual graph is like selling sand in the Sahara.
What it looks to me is that you are getting more writes on vlun and less writes on PD. And that doesn't make sense unless you're getting a lot more cache hits. How does the graph for bandwidth and IOsize look?
And just a hunch, maybe look for the issue rather than ehat has changed...... At least one important thing has happened.... Both nodes have rebooted. That might cause some hosts to lose a path or two that might impact balance.. Are all VLUNs following the same trend or is it just some VLUNs or VVs?
Edit: from the looks of it, all PDs look better after upgrade and VLUNs are worse. What about VV? If VV is good and VLUN is bad it is usually outside the 3PAR where you have the problem.
Hello! Thanks for your answer!
SSDs are ok, but what I can't explain is why they have lower usage after upgrade. And I think that's the cause for VLUNs to look worse.
About what you said, HP reviewed and told us to change some LUNs from MRU to RR, you can see the host ports graph (that was bad before and after upgrade, but since we changed looks good and balanced).. but apparently this is not the cause for the behavior on SSDs..
All VLUNs are following the same trend, but the ones where we are noticing degradation are from DBA team.. as this is a production environment..
I also attached what you asked, I really don't see any big change on charts as the one I see on SSD IOPS.. the little improvement I get was changing the AO measurement interval..