Delete R5 Thin Pool and Expand R6 Thin Pool

Before your get too far, what is the ultimate goal here ? You might do a lot of work, and not get the capacity nor performance that you are thinking you might get.

Hi Dynamox, We had a RAID 5 thin pool with SATA disks and we also have a RAID 6 Thin pool of SATA disks. We wanted to remove the RAID 5 thin pool and reuse the space for the RAID 6 thin pool as we felt that this would give better performance.

Once the TDATs are no longer in use, you should be able to create new ones.  I assume the SATA disks are all the same size.  You should not mix disks of different sizes in the same pool.  Also every disk in a given pool should have the same number of TDATs and the size of each should be roughly the same.  Disks with SFS volumes or VAULT volumes can have one TDAT slightly smaller to allow you to use the entire capacity of all the drives.

you will need to use symmgrate to move tdevs to another pool

Hi Quincy56, How do I ensure that all TDATs are not in use. The Thin Pool that I want to remove has used capacity on the remaining DATA volumes... but there are no TDEV's bound to this pool. I have been disabling, draining and removing Data volumes but the used capacity is being moved to remaing DATA volumes. I'm not sure how I can remove the remaining DATA volumes? Do I need to use symmigrate to move the used capacity?

The disks are a different manufacturer but the size and specs are the same.

I thought if you drained and disabled a TDAT, that it would remove all allocations from any TDEVs.  There are migrate command that will just migrate from one pool and not other allocations that may reside on EFD for example, if you can figure out what TDEVs still have allocations on the TDATs.

Right, you have allocations from TDEVs in that pool from tiering. So those TDEVs are not bound to that pool but have allocations that need to be removed. So determine what TDEVs still have allocations and use symmigrate as dynamox said to move those allocations out.

Hi Dynamox, There are no longer any TDEV's bound to this pool which I wish to delete. There are 'Other Pool Bound Volumes'. There is approx 20% used capacity on this pool.

And to add, if you have allocations in that pool still from tiering that pool may still be defined as a FAST VP tier and used in a FAST VP policy. You will need to remove those before you will be able to remove the pool, if that is your end goal.

Okay, do you know how to empty the Pool and then delete?

I can't figure out how to use command to symmigrate to move data from R5 pool to R6 pool. I could move the TDEV's bound to the pool easily enough but no idea how to move the other data. Any ideas on how to select unbound TDEV's?

AFAIK, TDEVs that are not bound are not ready and can't have any allocations.

Hi,

I am getting the same issue, I want to destroy a thin pool which is a part of FAST VP. I have already unbound all the devices associated to that pool via VLUN migration but it has allocations from another pool. How can I remove the allocations from another pool and remove it from FAST VP.

Thanks in Advance.

Aman