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Rescan storage disk capacity physical RHEL – multipath storage device

Sometimes infrastructure servers are physical and directly connected to storage and not virtual ones. In virtualization cases, one has to assign a new virtual disk on the virtual server and proceed with the expand. In case of a physical server one should do the following in order to assign more space on a partition or a lvm.

Find storage adapters and rescan them:

ls /sys/class/scsi_host/
echo "- - -" > /sys/class/scsi_host/hostX/scan

where X is 0 to 10 in my system (some online and some offline)

After re scanning storage adapters a new multipath device will be visible and ready to be used.

multipath -ll
4 paths are available for this storage device ( disk 50G)

Initialize your disk and use it appropriately.

pvcreate /dev/mapper/mpathm