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

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    

Open in new window



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    

Open in new window


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.
LVL 9
Senior IT System EngineerIT ProfessionalAsked:
Who is Participating?
 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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.
0
 
Senior IT System EngineerIT ProfessionalAuthor Commented:
Thanks Andrew,

Is there any outage or problem when I set the PSP in one VMFS on one ESXi host ?
0
 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
There should not be an outage, but we would always ensure, no VMs are present just in case, a storage glitch appears.
0
Simplify Active Directory Administration

Administration of Active Directory does not have to be hard.  Too often what should be a simple task is made more difficult than it needs to be.The solution?  Hyena from SystemTools Software.  With ease-of-use as well as powerful importing and bulk updating capabilities.

 
Senior IT System EngineerIT ProfessionalAuthor Commented:
OK so just Vmotion of the VM from the ESXi host is enough ?

No need svmotion ?
0
 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
To move VMs from the datastore, you would need to use Storage vMotion, or turn off the VM.
1
 
Senior IT System EngineerIT ProfessionalAuthor Commented:
Thanks !
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.