Renaming hdisk on AIX
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(Created page with 'This was taken from Karsten Seresse email: <pre> > Is there any possibility to rename hdisks in AIX 5.2 ? > I do not want to rename the rootvg, but external harddisks. > I know …')
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(Created page with 'This was taken from Karsten Seresse email: <pre> > Is there any possibility to rename hdisks in AIX 5.2 ? > I do not want to rename the rootvg, but external harddisks. > I know …')
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Revision as of 22:06, 3 November 2009
This was taken from Karsten Seresse email:
> Is there any possibility to rename hdisks in AIX 5.2 ? > I do not want to rename the rootvg, but external harddisks. > I know that the System is working with PVID and the hdisk name does not matter, but for administration reasons it would be useful for me. > > Any hints are welcome. If you want to do it by the book, you need to remove the disks inquestion, create dummy disks with mkdev and then let cfgmgr "find" the disks again and assign them the new numbers. However, there is a more, let's say, direct approach for the not so faint at heart. ;-) DISCLAIMER: USE AT YOUR OWN RISK, NO WARRANTIES! I have tested this on my 43P test box and it worked, but it may still lead to some issues in a production evironment! Handle with care! Having said that: if you want to rename the disks in a VG which is varyoff at the moment, here's how to do it. In this case, we have hdisk1 in the testvg, currently not active, which needs to be changed to hdisk9: # lspv hdisk0 004b559ad50d68af rootvg active hdisk1 004b559a5b094213 testvg We need the CuDv and CuAt stanzas for that disk from the ODM: # odmget -q 'name = hdisk1' CuAt > CuAt.hdisk1 # odmget -q 'name = hdisk1' CuDv > CuDv.hdisk1 # cat *.hdisk1 CuAt: name = "hdisk1" attribute = "unique_id" value = "1E0868269AAD07DGHS09U03IBMscsi" type = "R" generic = "" rep = "nl" nls_index = 79 CuAt: name = "hdisk1" attribute = "pvid" value = "004b559a5b0942130000000000000000" type = "R" generic = "D" rep = "s" nls_index = 2 ..... We copy the stanzas and edit them so every instance of hdisk1 is changed to hdisk9: # cp CuAt.hdisk1 CuAt.hdisk9 # cp CuDv.hdisk1 CuDv.hdisk9 # # now :%s/hdisk1/hdisk9/ in *.hdisk9 Now we change the ODM entries: # odmchange -o CuDv -q 'name = hdisk1' CuDv.hdisk9 # odmchange -o CuAt -q 'name = hdisk1' CuAt.hdisk9 Checking that the changes are correct: # odmget -q 'name like hdisk*' CuDv CuDv: name = "hdisk0" status = 1 chgstatus = 2 ddins = "scdisk" location = "10-60-00-8,0" parent = "scsi0" connwhere = "8,0" PdDvLn = "disk/scsi/scsd" CuDv: name = "hdisk9" status = 1 chgstatus = 2 ddins = "scdisk" location = "10-60-00-9,0" parent = "scsi0" connwhere = "9,0" PdDvLn = "disk/scsi/scsd" # odmget -q 'name like hdisk*' CuAt ..... You'll see that all hdisk1 entries were changed to hdisk9. Now we change the device files to the correct name: # mv /dev/hdisk1 /dev/hdisk9 # mv /dev/rhdisk1 /dev/rhdisk9 (yes, you can do that, it works) and we need to save the ODM changes to the bootblock: # bosboot -ad /dev/hdisk0 bosboot: Boot image is 18004 512 byte blocks. In theorie, you could varyon the testvg now. But to make sure the changes are permanent, we restart the system: # shutdown -Fr ..... # lspv hdisk0 004b559ad50d68af rootvg active hdisk9 004b559a5b094213 testvg active # Voila! :-) Have fun ... Andreas -- Dipl.-Phys. Andreas Leibl IBM Certified Advanced Technical Expert IBM Business Services GmbH, External Contractor