Batch-migrate tool will not create pairing file randomly, it's done based of matching capacities and the device ID's alphabetically. You can always edit file  from vplex management server, i suggest copy the contents to a local editor, make your changes and run the plan-check once more, other than that there is no other way to do it automatically for batch.

Thanks Ayrton,

I understand the logic of matching capacities, but the entire logic of it does not work well if you have lots of ext / devs we need to migrate. so if we had 3 x 10 GB , 3 x 20 GB and 3 x 30 GB contructs we needed to migrate, the auto pairing would go ahead and pick up 20 GB / 30 GB as targets for 10 GB source ( I think it just looks at the basic req of equal or greater ).

Again editing the file seems to be only way, I just wanted to check if someone had come up with these issue's and figured out a smarter way

Cheers !!

vignesh47

I would't agree with you. When you issue the command to create pairing file, you will specify source devices and target devices, 10GB's will be matched with 10GB's, 20GB's with 20GB's and 30GB's with 30GB's. Yes the targets ID's will be not necessarily as you want it. Easiser way, since you know the source and target pairing you want, i suggest you create a pairing file using a simple shell script which can be used as you batch-plan file, place it in var/log/VPlex/cli and check-plan your plan file and you should be good to go.

Sorry if you do not agree, try it out if you have a VPLEX - I have documented evidence of multiple test scenario's

Sample msg : ( this is where pairing goes wrong with combining multiple session , as it picks a target which meets equal or larger criteria )

INFO: The target 'xxx' is larger than the source 'yyy'.  Migration to a larger target does not make the additional capacity available for use.  Follow the steps for storage volume expansion to configure the additional capacity.  There may be limitations in some situations; please review VPLEX documentation.  Do you wish to proceed? (Yes/No)

Create plan is not really that useful - the entire reason for starting this thread was to understand if there is a certain pairing logic for that command.

And manually controlling pairing via a file is well understood, that file needs additional inputs apart from just the dev / ext we want to migrate. I wanted to see if there is a way to avoid manually editing the file - obviously from this thread there is no way out

Cheers Aryton !!

This from the Admin guide:

I think this is what you referred to, as I was looking for the same.

Tom