Quite often we need add new disks, or new filesystems, or new partitions etc. on storage area, which requires rebuilding our multipath configuration. How to do in without restarting the server ? Follow the next.
1. Present newly created disk to the server inside storage configuration.
2. Rescan all HBAs by
hp_rescan -a.
3. Restart multipathd.
4. Update /etc/multipath.conf (if necessary, in case of new disk names, for an instance).
5. Run
multipath -ll
and create necessary partition table (with help of fdisk, for example) on one of the devices, related to the new disk.
6. Update partition table of other devices, related to the new disk, using
blockdev --rereadpt device_name
7. Update multipath device using
kpartx -a /dev/mapper/multipath_device_name
8. At that point you can create filesystem on it.
