Check if the path is a multipath device.

NAME RO sdb 0 └─36006016003b03a00da41ad58e6ab1cc0 0 sdd 0 └─36006016015e03a00bea7c7588c91d581 0 sde 0 sdf 0 └─36006016003b03a00da41ad58e6ab1cc0 0 sdg 0 └─36006016015e03a00bea7c7588c91d581 0 sr0 0 vda 0 └─vda1 0.

Commands example: echo 1 > /sys/bus/scsi/drivers/sd/9:0:0:6/rescan.

Use multipath -l <path> to discover multipath device Valid <path> could be WWN or /dev/sdb like path.

Return the multipath by wwn 1) When multipath friendly names are ON: a device file will show up in /dev/disk/by-id/dm-uuid-mpath-<WWN> /dev/disk/by-id/dm-name-mpath<N> /dev/disk/by-id/scsi-mpath<N> /dev/mapper/mpath<N> 2) When multipath friendly names are OFF: /dev/disk/by-id/dm-uuid-mpath-<WWN> /dev/disk/by-id/scsi-<WWN> /dev/mapper/<WWN>.

path = "/dev/sdb" or " "/dev/disk/by-path/ip-10.244.213.177:3260-iscsi-iqn.1992-04.com.emc:cx.fnm00150600267.a0-lun-10".

Flush device(s) via multipath -f <device>/-F.

output: sudo sg_scan /dev/disk/by-path/pci-0000:05:00.1-fc-0x5006016d09200925-lun-0 /dev/disk/by-path/pci-0000:05:00.1-fc-0x5006016d09200925-lun-0: scsi9 channel=0 id=0 lun=0 [em].

Get block device size.

Reconfigure multipath.

Force multipath reloads devices via multipath -r.

path = "/dev/sdb" or "sdb" Use echo 1 > /sys/block/%s/device/delete to force delete the device.

Do a more specific scan instead of a wildcard.

use echo "c t l" > to /sys/class/scsi_host/%s/scan.