After adding new SAN LUNs, multipath devices are not showing up in Device Mapper Multipath?
Issue
- Have 17 LUNs newly made available to the server, can see those disks from
fdisk -l. However,multipath -lldoes not show paths to those LUNs. Following are the steps performed so far:
1. Rescan Fiber Channel by running:
# echo "1" > /sys/class/fc_host/host3/issue_lip
# echo "1" > /sys/class/fc_host/host4/issue_lip
Please note that performing issue_lip is not recommended to scan the newly added devices on existing storage ports. This operation performs a Loop Initialization Protocol (LIP), scans the interconnect, and causes the SCSI layer to be updated to reflect the devices currently on the bus. Essentially, an LIP is a bus reset, and causes device addition and removal. To scan the devices without affecting the existing paths, use How to rescan the SCSI bus to add or remove a SCSI device without rebooting the computer
2. Reload multipath configuration:
# service multipathd reload
3. Check new devices with fdisk -l
4. multipath -ll
Environment
- Red Hat Enterprise Linux 6
- Device Mapper Multipath(DM Multipath)
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