After changing fabric switch paths, device-mapper-multipath does not fail over to new paths on Red Hat Enterprise Linux
Issue
- We have migrated ports to new ports, and performed a scsi rescan but the filesystem became read only after.
Environment
- Red Hat Enterprise Linux (RHEL) including,
- Red Hat Enterprise Linux 5 (RHEL5)
- Red Hat Enterprise linux 6 (RHEL6)
- device-mapper-multipath managing paths
- SAN-based storage providing multiple paths to a host
- Attempting to change paths to LUNs to use different fabric switch ports by
- adding new paths through new ports, then
- removing old paths through old ports.
- Attempting to change paths to LUNs to use different fabric switch ports by
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