I have to configure disk mirroring in IBM pSeries 610 / 6C1 AIX machine which has six 36gb SCSI hotswap hard disks (not SSA). ROOTVG is created on hdisk0 and DATAVG created on hdisk1. I don't want to do mirroring for ROOTVG. Only for DATAVG i want to do mirroring on any other disks like hdisk2,3,4,5. I want to do it in command line and not SMITTY. If anybody knows, please help me. Thanks and regards.

First select the disk which you want to use for the mirror, ideal would be an disk which is attached to a differant scsi adapter. Then add the disk to the datavg like: extendvg datavg hdiskx than you can create the mirror by using the mirrorvg command , mirrorvg -m datavg hdiskx hdiskx is your destination disk ! After that Quorum will be disabled for the volumegroup ,to activate this the volumgroup must be varied off and varied on. You can add the -S flag to the command which causes the synchronizing of the disks to happen in the background. A more back to the basics option is to create the mirroring by yourself by creating copies of each separate logical volume, this can be done by using the mklvcopy command. To remove mirroring , use the unmirrorvg command or the rmlvcopy command. For more information on the above commands you could take a peek at the man pages. Well thats about it, good luck. Ron van Holk