3 disk rootvg in AIX 3 disk rootvg in AIX vini14 (TechnicalUser) (OP) 9 Apr 14 10:50 hello, what if i have a rootvg with 3 disks, and if i run mirrrvg rootvg, what will happen? RE: 3 disk rootvg in AIX TSch (TechnicalUser) 11 Apr 14 09:54 Hey, well according to the man pages, the following should happen: By default, mirrorvg attempts to mirror the logical volumes onto any of the disks in a volume group. If you wish to control which drives are used for mirroring, you must include the list of disks in the input parameters, physicalvolume. Mirror strictness is enforced. Additionally, mirrorvg mirrors the logical volumes, using the default settings of the logical volume being mirrored. If you wish to violate mirror strictness or affect the policy by which the mirror is created, you must execute the mirroring of all logical volumes manually with the mklvcopy command. I think you will get one additional copy and AIX chooses which disks are used ... Regards, Thomas RE: 3 disk rootvg in AIX AIXLogician (TechnicalUser) 11 Apr 14 10:56 If your rootvg is spread across three disks, 1st off its NOT a good practice. You need to get all those LV on to a single disk. Say your 4th disk is large enough to accommodate all LV's, then you can either run CODE --> migratepv orrun CODEmklvcopy . Note: Migratepv will migrate the LV from one PV to another PV, but mklvcopy will mirror a LV to designated disk.