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How to Reclaim a THIN LUN from VMAX

Author: Dinesh Punyani

xxxx- means SYM/VMAX ID’s last 4 digit 

AAAA-SYM Dev ID of the LUN

NOTE:

STEP-1 to STEP-8 are for reclaiming storage from a Server/Storage Group

Step-9 to Step-10 are for reclaiming UNUSED space from THIN LUN to the parent pool

NOTE: Storage Reclaim from a Server will delete all Data on the LUN which is being reclaimed.

1. 

Create a List of THIN LUNS that needs to be reclaimed.

2. 

LUN should be un-mounted from HOST/SERVER and make sure No IO operation are happening

on these LUNs.

3. 

List Down the storage group to which these luns are allocated

Symaccess –sid xxxx list –type storage –dev  AAAA 

4. 

Remove the LUN from all Storage Group and FAST Storage GROUP. And Make sure LUN is not

being USED.

Symaccess –sid XXXX –name SERVER_SG remove dev AAAA -unmap

Symaccess –sid xxxx –name FAST_SG remove dev AAAA -unmap 

5. 

After completion of above command. Make the Device in Not Ready State.

symdev -sid xxxx not_ready AAAA 

6. 

Unbind the Device from the Parent Pool

Symconfigure –sid xxxx –f “Unbind.txt” –v preview

Or else

Symconfigure –sid xxxx –cmd “unbind tdev AAAA from pool Tier3_SATA_POOL;” –v preview

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Unbind.TXT Content is

unbind tdev AAAA from pool Tier3_SATA_POOL;

Symconfigure –sid xxxx –f “Unbind.txt” –v commit

(After above step all your data is permanently lost)

7. 

Dissolve Meta LUN to disassociate meta members from Meta Head after UNBINDING the LUN

from POOL.

Symconfigure –sid xxxx –cmd “dissolve meta dev AAAA ;”  –v preview

Symconfigure –sid xxxx –cmd “dissolve meta dev AAAA;” –v commit

8. 

If require you can create Meta TDEVs which are freed up in above steps. But there is no harm in

keeping these TDEVs as thes can be re-used later for new allocations.

Symconfigure –sid xxxx –cmd “delete dev AAAA raidset=false;” –v preview

Symconfigure –sid xxxx –cmd “delete dev AAAA raidset=false;” –v commit

9. 

If you want to reclaim unused space to pool from a THIN LUN without losing data on that LUN

then follow below Procedure:

Symconfigure –sid xxxx –f “Reclaim.txt” –v preview

Reclaim.TXT Content is

Start free on tdev AAAA start_cyl=0 and end_cyl=last_cyl type =reclaim;

Example: start free on tdev 20C7 start_cyl=0 end_cyl=last_cyl type=reclaim;

Or else

Symconfigure –sid xxxx –cmd “Start f ree on tdev AAAA start_cyl=0 and end_cyl=last_cyl type

=reclaim;” –v preview

Symconfigure –sid xxxx –f “Reclaim.txt” –v commit 

10.  To know the current reclaim status you can run below command.

Symcfg –sid xxxx show –thin –pool TIER3_SATA_POOL –detail –GB |FIND /I “Reclaim”