Here is the output of the /var/log/messages after a rescan is performed:
Feb 3 14:22:45 Hostd: ReconcileVMFSDatastores called: refresh = true, rescan = true
Feb 3 14:22:45 Hostd: RefreshVMFSVolumes called
Feb 3 14:22:45 Hostd: RescanVmfs called
Feb 3 14:22:45 Hostd: FetchDVPortgroups: added 0 items
Feb 3 14:22:45 vmkernel: 1:00:16:29.953 cpu0:4969)Vol3: 1488: Could not open device 'mpx.vmhba1:C0:T0:L0:6' for probing: Permission denied
Feb 3 14:22:45 vmkernel: 1:00:16:29.955 cpu1:4969)Vol3: 608: Could not open device 'mpx.vmhba1:C0:T0:L0:6' for volume open: Permission denied
Feb 3 14:22:45 vmkernel: 1:00:16:29.963 cpu1:4969)Vol3: 1488: Could not open device 'mpx.vmhba1:C0:T0:L0:5' for probing: Permission denied
Feb 3 14:22:45 vmkernel: 1:00:16:29.964 cpu1:4969)Vol3: 608: Could not open device 'mpx.vmhba1:C0:T0:L0:5' for volume open: Permission denied
Feb 3 14:22:45 vmkernel: 1:00:16:29.972 cpu1:4969)Vol3: 1488: Could not open device 'mpx.vmhba1:C0:T0:L0:2' for probing: Permission denied
Feb 3 14:22:45 vmkernel: 1:00:16:29.973 cpu1:4969)Vol3: 608: Could not open device 'mpx.vmhba1:C0:T0:L0:2' for volume open: Permission denied
Feb 3 14:22:45 vmkernel: 1:00:16:29.975 cpu1:4969)FSS: 3702: No FS driver claimed device 'mpx.vmhba1:C0:T0:L0:2': Not supported
Feb 3 14:22:45 vmkernel: 1:00:16:29.976 cpu1:4969)Vol3: 1488: Could not open device 'mpx.vmhba1:C0:T0:L0:8' for probing: Permission denied
Feb 3 14:22:45 vmkernel: 1:00:16:29.977 cpu1:4969)Vol3: 608: Could not open device 'mpx.vmhba1:C0:T0:L0:8' for volume open: Permission denied
Feb 3 14:22:45 Hostd: VmfsUpdate: got VMFS message timestamp=1265206965322362 specific=0 name= label=
Feb 3 14:22:45 Hostd: RefreshVMFSVolumes: refreshed volume, id 4b5d5250-a0bdf374-ca82-0017a48e39dd, name datastore1
Feb 3 14:22:45 Hostd: SetVolume: Datastore 4b5d5250-a0bdf374-ca82-0017a48e39dd has changed provider volume pointer
Feb 3 14:22:45 Hostd: ReconcileVMFSDatastores: Done discovering new filesystem volumes.
Feb 3 14:22:45 Hostd: ReconcileNASDatastores: Discovering new filesystem volumes.
Feb 3 14:22:45 Hostd: RefreshNASVolumes called
Feb 3 14:22:45 Hostd: ReconcileNASDatastores: Done discovering new filesystem volumes.
Feb 3 14:22:45 Hostd: SendStorageInfoEvent() called
Feb 3 14:22:45 Hostd: Task Completed : haTask-ha-host-vim.host.StorageSystem.refresh-184 Status success
Feb 3 14:22:46 Hostd: Unrecognized HBA status FC HBA: vmhba2 - 3
Feb 3 14:22:46 Hostd: Unrecognized HBA status FC HBA: vmhba3 - 3
Feb 3 14:22:46 Hostd: CreateISCSIHBA
Feb 3 14:22:46 Hostd: IP properties discovery failure on iSCSI HBA: iqn.1998-01.com.vmware:localhost-4d5e6611: Check vmkernel tcp/ip settings for network properties for sw iscsi
Feb 3 14:22:46 vmkernel: 1:00:16:31.190 cpu0:4103)NMP: nmp_CompleteCommandForPath: Command 0x12 (0x4100050a1640) to NMP device "mpx.vmhba0:C0:T0:L0" failed on physical path "vmhba0:C0:T0:L0" H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x24 0x0.
Feb 3 14:22:46 Hostd: CreateDurableName: Header length field exceeds actual payload
Feb 3 14:22:46 vmkernel: 1:00:16:31.190 cpu0:4103)ScsiDeviceIO: 747: Command 0x12 to device "mpx.vmhba0:C0:T0:L0" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x24 0x0.
Feb 3 14:22:46 vmkernel: 1:00:16:31.215 cpu3:26405)NMP: nmp_CompleteCommandForPath: Command 0x12 (0x4100050a1640) to NMP device "mpx.vmhba1:C0:T0:L0" failed on physical path "vmhba1:C0:T0:L0" H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
Feb 3 14:22:46 vmkernel: 1:00:16:31.215 cpu3:26405)ScsiDeviceIO: 747: Command 0x12 to device "mpx.vmhba1:C0:T0:L0" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
Feb 3 14:22:46 Hostd: CreateDurableName: Header length field exceeds actual payload
Feb 3 14:22:46 Hostd: FetchDVPortgroups: added 0 items
Feb 3 14:23:06 Hostd: Task Created : haTask-ha-host-vim.host.StorageSystem.rescanAllHba-185
Feb 3 14:23:06 vmkernel: 1:00:16:50.736 cpu1:5316)ScsiNpiv: 1304: GetInfo for adapter vmhba2, , max_vports=0, vports_inuse=0, linktype=0, state=0, failreason=0, rv=-2, sts=bad0020
Feb 3 14:23:06 vmkernel: 1:00:16:50.737 cpu1:5316)ScsiNpiv: 1304: GetInfo for adapter vmhba2, , max_vports=0, vports_inuse=0, linktype=0, state=0, failreason=0, rv=-2, sts=bad0020
Feb 3 14:23:06 vmkernel: 1:00:16:50.737 cpu1:5316)ScsiNpiv: 1304: GetInfo for adapter vmhba3, , max_vports=0, vports_inuse=0, linktype=0, state=0, failreason=0, rv=-2, sts=bad0020
Feb 3 14:23:06 vmkernel: 1:00:16:50.738 cpu1:5316)ScsiNpiv: 1304: GetInfo for adapter vmhba3, , max_vports=0, vports_inuse=0, linktype=0, state=0, failreason=0, rv=-2, sts=bad0020
Feb 3 14:23:06 Hostd: FetchDVPortgroups: added 0 items
Feb 3 14:23:11 vmkernel: 1:00:16:55.743 cpu2:4759)Tcpip_Socket: 2886: msleep returned 4
Feb 3 14:23:11 iscsid: connection failed for discovery (err = Interrupted system call)!
Feb 3 14:23:11 iscsid: connection to discovery address 10.1.2.126 failed
It appears that I might have a software problem with the iSCSI setup, so I am going to go play with that and see if that is the cause.