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nimadm with option to migrate multiple lpars at once
In our environment we have more than 400 active lpars to migrate to AIX 7.3 soon. For the migration we only have six month time and only one day a week. So we have to migrate multiple systems simultanious. Unfortunately, there is no build-in way to do this with nimadm. In the moment I have to do it with nohup or GNU parallel. Both ways are not very ressource friendly. Simultanious migration on only four lpars causing 100% cpu usage for 45 min and the nimadm processes using only two threads per process. Some tests showed that I would need one physical core per lpar migration to speed up the migration by 10 to 20%. This is not a good ressource management... It would be great to have the functionality to parallize the migration within nimadm. Maby by giving a mac_group or multiple systems at one like nimadm -C mac_group or nimadm -c lpar1 -c lpar2 -c lparx ...
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