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VMware VMFS datastore LUN PSP and settings differences across different ESXi hosts ?

Posted on 2016-10-03
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Last Modified: 2016-10-10
Hi All,

When I run a Powershell script that is recommended by my Hardware vendor http://www.codyhosterman.com/2016/05/updated-flasharray-vmware-best-practices-powercli-scripts/ I get the eblow strange result in my ESXi hosts:

DRS Cluster: Production - II (PRODESXi14)

NAA                                  PSP               PathCount IOPSValue ATSMode
---                                  ---               --------- --------- -------
naa.624a937095607650b5eaec0800011025 MostRecentlyUsed* 4         N/A       N/A    
naa.624a937095607650b5eaec0800011026 MostRecentlyUsed* 4         N/A       N/A    
naa.624a937095607650b5eaec0800011027 MostRecentlyUsed* 4         N/A       N/A    
naa.624a937095607650b5eaec0800011028 MostRecentlyUsed* 4         N/A       N/A    
naa.624a937095607650b5eaec0800011029 MostRecentlyUsed* 4         N/A       N/A    
naa.624a937095607650b5eaec080001102a MostRecentlyUsed* 4         N/A       N/A    
naa.624a937095607650b5eaec080001102b MostRecentlyUsed* 4         N/A       N/A    
naa.624a937095607650b5eaec080001102c MostRecentlyUsed* 4         N/A       N/A    

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and this is from the other ESXi hosts (PRODESXi08)  in the same DRS cluster as above:

NAA                                  PSP        PathCount IOPSValue ATSMode
---                                  ---        --------- --------- ------- 
naa.624a937095607650b5eaec0800011025 RoundRobin 4         1000*     N/A    
naa.624a937095607650b5eaec0800011026 RoundRobin 4         1000*     N/A    
naa.624a937095607650b5eaec0800011027 RoundRobin 4         1000*     N/A    
naa.624a937095607650b5eaec0800011028 RoundRobin 4         1000*     N/A    
naa.624a937095607650b5eaec0800011029 RoundRobin 4         1000*     N/A    
naa.624a937095607650b5eaec080001001f RoundRobin 4         1000*     N/A    
naa.624a937095607650b5eaec080001102a RoundRobin 4         1000*     N/A    
naa.624a937095607650b5eaec080001102b RoundRobin 4         1000*     N/A    
naa.624a937095607650b5eaec080001102c RoundRobin 4         1000*     N/A    

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My question is that:

1. Do I need to standardize the PSP policy for the same VMFS data store accessed by all different ESXi hosts ? or is it there for a reason ?
2. What is the best way of doing it without impacting the production VM server running on the host and the VMFS data store ?  

Any help and suggestion would be greatly appreciated.

Thanks.
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Accepted Solution

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Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 41827532
1. Do I need to standardize the PSP policy for the same VMFS data store accessed by all different ESXi hosts ? or is it there for a reason ?

Yes, usually based on vendor recommendations as to what works best for your SAN.

2. What is the best way of doing it without impacting the production VM server running on the host and the VMFS data store ?

Migrate the VMs off the datastore using Storage vMotion.
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Author Comment

by:Senior IT System Engineer
ID: 41827535
Thanks Andrew,

Is there any outage or problem when I set the PSP in one VMFS on one ESXi host ?
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Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 41827545
There should not be an outage, but we would always ensure, no VMs are present just in case, a storage glitch appears.
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Author Comment

by:Senior IT System Engineer
ID: 41827551
OK so just Vmotion of the VM from the ESXi host is enough ?

No need svmotion ?
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LVL 120
ID: 41827668
To move VMs from the datastore, you would need to use Storage vMotion, or turn off the VM.
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Author Closing Comment

by:Senior IT System Engineer
ID: 41837872
Thanks !
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