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AIX cluster mapping
We have allocated 10 TB storage to a AIX cluster which has a DMX 4 has the backend. We used two FA's 7c:0 and 10c:0. Now due to some performance issues we decided to add two more FA's(04 and 13) other than 7c and 10c. So, my doubt is can i map the existing devices on 7c and 10 c to 4 and 13 when the AIX cluster is up and running. Will there be any impact to the applications. Also do i need to ensure any other things before adding two more FA pair. Is there any need that devices mapped to other FA (4 and 13 ) must have same Lund address as mapped to (7c and 10c). I was thinking it should be a straight forward change(online). Please let me know if i am missing anything.
thanks
Hello Vimad,
You dont mention what multipathing software you are using?
Also the connectivity documents on Support -> Tech Docs and Adviseries -> Host Connectivity -> Aix Host Connectivity Guide may be of some assistance.
Hope this helps
Nollaig
RobertDudley
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Posted August 25th, 2010 09:00
If you are using PowerPath it will pick up on the Hdiskpower # so lun address should not matter. If you are not using PowerPath then I am not sure on the lun #; ideally I would try to make them the same.
ZepHead
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Posted August 17th, 2010 08:00
You should pose your concern about what impact it would be to the application vendor, as well as the same LUN ID question.. You can make your changes in the background and would allow it, but then once you try to 'bring it in' the host environment, there is no telling what will happen - especially "live." In addition to this, will need to ensure the correct port flags are set to present to this platform, as well as setting appropriate reservation bits on the device for clustering.