When a new LUNs are presented to Fibre Channel SAN from a Pure Storage FlashArray//X70 R3, Linux (SLES) does not find those (as opposed to other FC storage systems like the HP EVA or 3PAR StorServ).
Even after a rescan-scsi-bus.sh the new LUNs are not detected by the Linux kernel.
The only two methods that are known to work are:
Reboot the machine after the LUN mappings have changed.
Use option
-iforrescan-scsi-bus.sh, re-initializing the loop via LIP primitive.
The second method causes I/O errors for existing LUNs on the loop when they are being accessed while LIP is executing.
Naturally for an enterprise server or even HA cluster neither frequent reboots nor collateral I/O errors are acceptable as a solution. It doesn't help that I wouldn't have bought that storage system. It's there now.
Have you tried;
echo "- - -" > /sys/class/scsi_host/host0/scan
Bit old-school but it works, not sure if it's any better than option 2 however.