> Is it legal to grow while RAID-5 recovery Is happening ? > > > 1. mdadm -C /dev/md0 -z 1000000 -l 5 -n 3 /dev/sd[a-c] > 2. mdadm -a /dev/md0 /dev/sdd > 3. mdadm -G /dev/md- -n 4 Hi Marri, One, If this is a live system I'm thinking it's safer to let the recovery complete and then add the extra disk (after backing up the data of course). Two, if this array isn't live yet (no data, lvm, filesystem, etc yet) it'd probably be easier to halt the existing RAID-5, and create the new array from scratch. That said I'm sure Neil will chime in and correct me. :-) -- Drew "Nothing in life is to be feared. It is only to be understood." --Marie Curie -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html