Insufficient memory available to IO Group error

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While using IBM Storwize V5000 Gen2 storage server, during creation of a new raid group (Storage pool), we can get following error:

CMMVC6532E The command cannot be initiated because there is insufficient free memory that is available to the I/O group.

This error is due to lack of memory in iogroup which can be increased by connecting to storage over putty and using following commands:

1. lsiogrp -delim :

   To look for all iogroups. As such only iogroup 0 might be used.

2. lsiogrp -delim : <iogroup number>

   To get details of iogroup 0

3. See the RAID memory allocation listed in above details for concerned iogroup
4. Increase the iogroup memory for raid using:

   chiogrp -feature raid -size <new-size> <iogroup number>

In our experience increasing from 40MB to 45MB resolved the issue.

Related links for study

What is an IO Group

https://www.ibm.com/support/knowledgecenter/STVLF4_8.1.0/spectrum.virtualize.810.doc/svc_iogroupovr_1bchag.html

Memory (Bitmap space) requirements for copy services, volume mirroring or RAID

https://www.ibm.com/support/knowledgecenter/STHGUJ_7.8.1/com.ibm.storwize.v5000.781.doc/svc_usecopyservmemtask_3t4ljl.html -

Get details of an iogroup, specifically "RAID total memory" and "RAID free memory"

https://www.ibm.com/support/knowledgecenter/STHGUJ_7.8.1/com.ibm.storwize.v5000.781.doc/svc_lsiogrp_21pdk1.html

Change IO group memory allocation for flash, raid, etc.

https://www.ibm.com/support/knowledgecenter/STHGUJ_7.8.1/com.ibm.storwize.v5000.781.doc/svc_modifyiogroup_21ifvl.html

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