Create the alt_disk (Consider we have hdisk0 & hdisk1 on the rootvg) sysdumpdev –s /dev/sysdumpnull --> If secondary dump device resides on hdisk1. rmlv dump_lv --> Remove the dump lv unmirrorvg rootvg hdisk1 --> unmirrror (Have to use the hdisk1 for alt_disk) chpv –c hdisk1 --> clear the boot image on the hard disk1. reducevg rootvg hdisk1 --> remove the hdisk1 from the rootvg disk. alt_disk_copy -d hdisk1 --> Take the alt disk clone on hdisk1 lspv --> confirm the "altinst_rootvg" created on hdisk1