Automatic recovery of failed paths in multipath not happenning

Two separate RHEL 6.1 on POWER LPARs.  They each have just one LUN and each are multipathed to two VIO servers. when one of the VIO servers is rebooted, not only did the paths not recover when the VIO server came back up, but one of the file systems remounted as read-only during the reboot.

kernel: ibmvscsi 30000011: Virtual adapter failed rc 2!
kernel: ibmvscsi 30000011: SRP_VERSION: 16.a
kernel: ibmvscsi 30000011: Partner adapter not ready
kernel: ibmvscsi 30000011: error after reset
multipathd: mpatha: sda - directio checker reports path is down
multipathd: checker failed path 8:0 in map mpatha
multipathd: mpatha: remaining active paths: 1
kernel: sd 0:0:1:0: [sda] Unhandled error code
kernel: sd 0:0:1:0: [sda] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
kernel: sd 0:0:1:0: [sda] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00
kernel: end_request: I/O error, dev sda, sector 0