Reclaim space after enabling TRIM support

To reclaim space after you enable TRIM support, you must run the mmreclaimspace command.

1. Configure the file system and the recovery group.
2. Run the mmreclaimspace command to manually start the TRIM function. A sample is shown for running the command on an IBM Storage Scale Erasure Code Edition node.

   [root@ece08]# mmreclaimspace  gpfs3 -P system --reclaim-threshold 80
   disk                disk size  failure holds    holds           free in KB          free in KB     reclaimed in KB
   name                    in KB    group metadata data        in full blocks        in fragments        in subblocks
   --------------- ------------- -------- -------- ----- -------------------- ------------------- -------------------
   Disks in storage pool: system (Maximum disk size allowed is 4.03 TB)
   RG001LG001VS001     335984640        1 yes      yes       177795072 ( 53%)         19448 ( 0%)      176283648 (52%)
   RG001LG007VS001     335984640        1 yes      yes       177876992 ( 53%)         17336 ( 0%)      176328704 (52%)
   RG001LG003VS001     335984640        1 yes      yes       177967104 ( 53%)         15320 ( 0%)      176422912 (53%)
   RG001LG005VS001     335984640        1 yes      yes       177922048 ( 53%)         11352 ( 0%)      176392192 (53%)
   RG001LG004VS001     335984640        2 yes      yes       177922048 ( 53%)         17208 ( 0%)      176369664 (52%)
   RG001LG006VS001     335984640        2 yes      yes       177915904 ( 53%)         17304 ( 0%)      176369664 (52%)
   RG001LG002VS001     335984640        2 yes      yes       177790976 ( 53%)         15160 ( 0%)      176257024 (52%)
   RG001LG008VS001     335984640        2 yes      yes       177764352 ( 53%)         14936 ( 0%)      176218112 (52%)
                   -------------                         -------------------- ------------------- -------------------
   (pool total)       2687877120                            1422954496 ( 53%)        128064 ( 0%)     1410641920 (52%)
                   =============                         ==================== =================== ===================
   (total)            2687877120                            1422954496 ( 53%)        128064 ( 0%)     1410641920 (52%)

   Note: The values of the --reclaim-threshold parameter can impact on performance. For more information about this parameter, see the mmreclaimspace command in the IBM Storage Scale: Command and Programming Reference Guide.