How to do rebinding a device (volume) using SMI-S provider without loosing data?

Question

Hi,

i have two basic questions:

1. Say, i have a lun (which has data) which is bind to a pool (say foo)

If i rebind the lun to a different pool (say bar), will the data be erased.

I am assuming there wont be data loss. can any one please confirm?

2. If the answer is there is no data loss, any one know how to do it using SMI-S provider?

i know how to bind and unbind using provider and inorder to rebind, i can unbind from the current pool (here foo), and bind it to (bar).

but the data will be erased. i am wondering is there a way to do this without loosing data?

Usecase

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basically while adding fast vp policy, i want to rebind devices in a storage group to one of the pools of fast policy. i want to do it without loosing data.

Dream93 · Answer

Wow, thats a very quick reply. thanks a lot. this is my first question as i just want to try the community looks like its very actvie , which makes my job easier.

Thanks for the confirmation. yes, i did look at programmers' guide as well spec, but didnt find any reference.

the only interesting methods are EMCUnBindElements, EMCUnBindElement, EMCBindElement, EMCBindElements...

And EmcBindElement throws an error, if i tried to bind a 'bound lun' to different pool.

I see this community focus is VMAX/Symmeterix. do you know of any community which focusses on SMI-S provider?

thanks for the help,

Tandok · Answer

Hi, To answer the first question, a 'rebind' will not cause data loss. But when you rebind, it does not move the existing extents to the new pool. Only the new allocations will go to the new pool. An unbind and rebind will on the other hand cause data to be lost. Since you are planning to move the device to a pool that is currently a tier within a Fast VP policy, you are better off using symmigrate to move from one pool to another, rather than a rebind. Not sure how this is done from the SMI-S provider. Need to take a look at the programmers guide. Regards

victorforde · Answer

Hi,

Another option might be via the Unisphere for VMAX REST API. The programmers guide is here https://support.emc.com/docu45978_EMC-Unisphere-for-VMAX-REST-API-Programmer's-Guide.pdf

Support site is down now so can't see the guide myself

Have a look at Matt Cowger's (an EMC ninja) blog to show how it can be used Unisphere for VMAX API & Carbon/Graphite | The Exaforge

Thanks,

Victor

VMAX

How to do rebinding a device (volume) using SMI-S provider without loosing data?

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