![]() Lsdev -Cc disk -F name | while read line do chdev -l $ -a queue_depth=32 -a reserve_policy=no_reserve -a algorithm=shortest_queue -P done This chdev -l hdisk0 -a algorithm=shortest_queue -P command should be run last else it will not change do it for hdisk4 and hdisk5 also. # chdev -l hdisk0 -a algorithm=shortest_queue -P # chdev -l hdisk0 -a reserve_policy=no_reserve -P Now change definition for each disks as below. Shortest_queue // shortest_queue is added only after earlier manage_disk_drivers command If algorithm is fail_over then you have to change it to shortest_queue You can check disks definition by running lsattr -El hdisk0 or just to check algorithm parameter which has to be changed. Then check if any others disks are attached. If your server is connected to DS* then with chdef command all paths are not selected when you run lsmpio command. # manage_disk_drivers -d IBMFlash -o AIX_AAPCM # manage_disk_drivers -d 2107DS8K -o AIX_AAPCM # manage_disk_drivers -d IBMSVC -o AIX_AAPCM # chdef -a algorithm=shortest_queue -c disk -s fcp -t mpioosdisk # chdef -a reserve_policy=no_reserve -c disk -s fcp -t mpioosdisk # chdef -a queue_depth=32 -c disk -s fcp -t mpioosdisk Grep for IBMFlash and 2107DS8K if its added all will show NO_OVERRIDEġst run chdef command to change definition of MPIO disk as below. IBMSVC NO_OVERRIDE NO_OVERRIDE,AIX_AAPCM,AIX_non_MPIO I will write commands to migrate from SDDPCM to AIXPCM, current enviornment is AIX(7.1) with 2107DS8K(DS*), IBMFlash, IBMSVC.Ĭommand to check SVC also check if IBMFlash and 2107DS8K etc. IBM ask customers to migrate away from SDDPCM multipathing and onto AIXPCM in response to the planned End of support (EOS) of SDDPCM with IBM storage products. The support for SDDPCM will officially end on June 30, 2020. ![]()
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