You can get the following error when adding Remote Copy volumes on a IBM Storwize or IBM Flashsystem:
CMMVC5970E The Remote Copy relationship was not created because there is not enough memory
The fix is to increase the memory on both storage devices.
Login to both Storwize / Flash system devices and check the remote_copy_total_memory with the following command:
lsiogrp 0
In this output you will find the remote_copy_total_memory:
IBM_FlashSystem:MB-SAN02:superuser>lsiogrp 0
id 0
name io_grp0
node_count 2
vdisk_count 8
host_count 0
flash_copy_total_memory 20.0MB
flash_copy_free_memory 20.0MB
remote_copy_total_memory 20.0MB
remote_copy_free_memory 0.0MB
mirroring_total_memory 45.0MB
mirroring_free_memory 5.0MB
raid_total_memory 52.2MB
raid_free_memory 0.0MB
maintenance no
compression_active no
accessible_vdisk_count 8
compression_supported yes
max_enclosures 20
encryption_supported yes
flash_copy_maximum_memory 2048.0MB
site_id
site_name
fctargetportmode enabled
compression_total_memory 0.0MB
deduplication_supported yes
deduplication_active no
nqn nqn.1986-03.com.ibm:nvme:2145.00000204A0408348
flash_copy_max_legacy_memory 2048.0MB
flash_copy_used_legacy_memory 0.0MB
remote_copy_maximum_memory 512.0MB
mirroring_maximum_memory 512.0MB
raid_maximum_memory 512.0MB
With the following command you can change the remote_copy_total_memory to – for example – 40MB:
chiogrp -feature remote -size 40 io_grp0
Then check if the setting has changed:
IBM_FlashSystem:MB-SAN02:superuser>lsiogrp 0
id 0
name io_grp0
node_count 2
vdisk_count 8
host_count 0
flash_copy_total_memory 20.0MB
flash_copy_free_memory 20.0MB
remote_copy_total_memory 40.0MB
remote_copy_free_memory 0.0MB
mirroring_total_memory 45.0MB
mirroring_free_memory 5.0MB
raid_total_memory 52.2MB
raid_free_memory 0.0MB
maintenance no
compression_active no
accessible_vdisk_count 8
compression_supported yes
max_enclosures 20
encryption_supported yes
flash_copy_maximum_memory 2048.0MB
site_id
site_name
fctargetportmode enabled
compression_total_memory 0.0MB
deduplication_supported yes
deduplication_active no
nqn nqn.1986-03.com.ibm:nvme:2145.00000204A0408348
flash_copy_max_legacy_memory 2048.0MB
flash_copy_used_legacy_memory 0.0MB
remote_copy_maximum_memory 512.0MB
mirroring_maximum_memory 512.0MB
raid_maximum_memory 512.0MB
That’s it!