This article will introduce the NMP settings.
If you look at the EMC Best Practices document, you will see the following contents:
Ensure that all servers attached to your storage array have storage path management software, such as EMC PowerPath, that is correctly installed and configured for path failover. EMC recommends a Round Robin path selection policy for XtremIO.
Firstly, let's look at what NMP is.
NMP is Native Multipathing Plug-IN.
NMP have three modes, they are MRU, Fixed and Round Robin.
Next, we will introduce the NMP settings step by step.
1) Click “Configuration”
2) Click “Storage”
3) Right click and select "Properties"
4) Click “Path Management”
5) Click “Round Robin”
The Round Robin settings have been completed.
But a thing to make sure is that ALUA is enabled on the storage arrat
e.g. SATP (Storage Array Type) should show FAILOVER MODE 4 enabled (ALUA)
Helping Link -
With XtremIO, we also recommend IOPS = 1 (in addition to Round Robin) setting - which means that every IO will use a different IO path and in effect be able to leverage the active/active architecture of XtremIO to the full extent.
As always, all this is also documented in the Host Configuration Guide for XtremIO (available on the Support website).