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 Post subject: Windows 2012 R2 MPIO Load Balancing Policies
PostPosted: Sun Nov 26, 2017 2:30 pm 

Joined: Sat Nov 25, 2017 1:04 pm
Posts: 3
Issues with the Microsoft DSM and 3par peer persistence 3.2.2 MU4

Two node hyper V cluster 2012R2

One node reporting all volumes as "08 Paths, Round Robin with Subset, Implicit Only"
Hovewer the other node is reporting some volumes as "08 Paths, Round Robin, Symmetric Access"
If i manually override this with mpclaim -l -d command I get the following LB policy:
"08 Paths, Round Robin with Subset, Symmetric Access"

so whats up with this, and what is the difference between:
"08 Paths, Round Robin with Subset, Symmetric Access"
"08 Paths, Round Robin with Subset, Implicit Only"


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 Post subject: Re: Windows 2012 R2 MPIO Load Balancing Policies
PostPosted: Mon Nov 27, 2017 12:47 pm 

Joined: Tue Nov 18, 2014 5:13 am
Posts: 12
hello,

We had a similar MPIO setting discrepancy case in some ouf our hyper-V clusters , and it turns out Peer Persistence has an addditionnal prerequisite : on both Arrays, the vlun for the replicated volumes MUST HAVE an identical LUNid !
I have been putting lunid in auto for years in my commands createvlun MY_CSV auto set:MY_HOSTSET, thinkingthe lunid being quite an useless parameter in modern OSes...


To fix that, Since we can't perform a removevlun on the passive side as long as the CSV is in the cluster (the hyper-v Cluster service puts a SCSI reservation on every path of the CSV), I ended up creating a new VV for each faulty CSV, the new ones having the correct configuraiton for PP. the I moved my VMs online with Hyper-V Storage Migration, removing the CSV from the cluster once its is empty, and so on to the next one ( I had 28 dubious CSVs)


here is a bad one, with LUNId 2 on the active and LUNid 3 on the passive, right before I destroyed it :

Code:
8440dsimg cli% showvlun -v CSV-SAS-PROD-D-01
[...]
VLUN Templates
Lun VVName            HostName          -Host_WWN/iSCSI_Name- Port     Type
[b]  2 [/b]CSV-SAS-PROD-D-01 set:Hset_CLUHYSAS ----------------       --- host set
---------------------------------------------------------------------------
  1 total                                                                 
8440dsimg cli%

8440batc cli% showvlun -v CSV-SAS-PROD-D-01.r
[...]
VLUN Templates
Lun VVName              HostName          -Host_WWN/iSCSI_Name- Port     Type
 [b] 3[/b] CSV-SAS-PROD-D-01.r set:Hset_CLUHYSAS ----------------       --- host set
-----------------------------------------------------------------------------

and checking the cluster doesn't lock it, becore I removevv it :

8440batc cli% showrsv CSV-SAS-PROD-D-01.r

no reservations found
8440batc cli%


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 Post subject: Re: Windows 2012 R2 MPIO Load Balancing Policies
PostPosted: Tue Nov 28, 2017 7:24 am 

Joined: Sat Nov 25, 2017 1:04 pm
Posts: 3
Thanks for reply,

However this is not the case here, they have the same lunid


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