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ScotN

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ScotN

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May 20th, 2015 10:00

VMAX ThinPool re-claim

If I add a disk to my Celerra Thin Pool I can immediately delete it as long as no data is on it.

Is there a way I can do the same thing when my Celerra Pool utilization shrinks ?

Consider a 10Tb Pool on the Celerra supported by 10 1TB disks. d1,2,3,4,5,...

If I delete 3 filesystems that use 6Tb I'd like to return a portion of the meta's to the original VMAX thin pool.  

- NAS, Evacuate the remaining data off  Celerra disk. (How) 

- NAS, Delete the disk.

- VMAX Unbind etc to return the tdat capacity. 

Option 2

Create a new pool and move remaining data to it.

nas_copy ?

  • dynamox

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    Posted May 20th, 2015 11:00

    i am afraid you are limited to option 2 (nas_copy, server_archive, nas_replicate)

  • ScotN

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    Posted May 21st, 2015 04:00

    Unfortunately I seem to be in a pickle.  The storage pool also contains my DART luns.  root_vdm's etc...

    Is there really no way to evacuate a meta disk from a pool without destroying the entire pool ?

    There seem to be options that would support it. 

    nas_pool...

    -shrink { |id= } [-storage ]

    -volumes [, ,...][-deep]

    Shrinks the storage pool by the specified unused volumes. The

    -storage option can be used to differentiate pools when the same pool

    name is used in multiple storage systems. When the -deep option is

    used to shrink a user-defined storage pool, it removes the specified

    member volumes from the pool, and recursively deletes any unused

    volumes unless it is a disk volume. If the -deep option is not used to

    shrink a user-defined storage pool, the member volumes are left

    intact so that they can be reused. The is_dynamic option must be set

    to n before shrinking system-defined storage pools.

    Note: Shrinking of a system-defined storage pool by default deletes

    member volumes automatically. Specifying the -deep option on the

    system-defined storage pool shrink does not make any difference.

  • ScotN

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    Posted May 21st, 2015 05:00

    Scratch that comment on DART volumes they are not in this user defined pool.  Only VDM_ROOT and user volumes.

  • dynamox

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    Posted May 21st, 2015 05:00

    if you use replicator (loop back replication), root_vdm file systems will be migrated as well (if you replicate VDM that is, in addition to user data file system)