We are experiencing some performance issues with data hosted on an aggregate that virtualizes a 3rd party array. After working with NetApp support, the conclusion was that the disk from the 3rd party array is not keeping up. That prompted the opening of a case with EMC. EMC quickly found that SPA on the EMC array is being far more utilized than SPB. They recommended balancing the load between service processors.
As far as I can tell, there is no way to manually configure our v3240 to use specific paths to 3rd party storage. Is this true? If not, how would I go about configuring our v3240 to use a path to a 3rd party LUN via SPB versus SPA?
You can see from the output of storage show disk -p and aggr status -r that we are overutilizing the path through sanswitch1, port 3/10 which goes to SPA. I'd like to swap the primary path with the secondary path so more LUNs will be accessed through sanswitch0, port 5/7 which goes to SPB.
plz try a "storage load balance" and then check the output again.
NetApp only allowes 2 pathes to a disk and will use A/P for a given path. It will try to load balance tho, eg 10 LUNs over 1a and 10 LUNs over 1b or similar. It might mess up in path down conditions etc leading to the need to do a "storage load balance" again.
"storage load balance" didn't change anything with the primary and secondary paths. Here is the output of storage load show. Initiator 5b's path is to SPA. I'd like to move some of that traffic to one of the other initiators.
Note: Those LUN's with 0's for their stats are owned by the other head in our HA pair.
We did check that. On the Clariion, we can assign a default owner, SPA or SPB, on a per LUN basis. The default ownership of LUNs was originally split equally between SPA and SPB. I believe the host (v3240) dictates which path is actually used. Since the v3240 perferred the path to SPA over SPB for whatever reason, many of the LUN's originally owned by SPB were trespassed to SPA. That is where we are now - SPA owns most of the LUNs and is handling most of the traffic.
We can trespass the LUNs back to SPB on the Clariion however we believe the LUNs would just be trespassed back to SPA if the v3240 didnt change its primary path.