2008-05-12 14:09:48.576 'FSVolumeProvider' 85621680 error RefreshVMFSVolumes: ProcessVmfs threw HostCtlException Unable to get FS Attrs for /vmfs/volumes/45a8f531-2cd8c4fd-3541-000d60981fc6

And if I try and check the volumes on the disk I get the following:

root@xxx/sbin/partedUtil get /dev/sdd
25600 64 32 52428800
1 32 52428799 251 128

And for a working LUN:

root@xxx:/sbin/partedUtil get /dev/sde
Geometry Known: 0
31311 255 63 503013376
1 128 503011214 251 128

Any more ideas? Anything more that I can post here that will help with troubleshooting?

I've checked the vmkwarning and vmkernel logs, there's nothing in there indicating an issue when rescaning the fibre HBAs.. I do see some issues on the iSCSI adapter but don't think its related:

ie:

May 13 10:14:31 esx1 vmkernel: 21:17:34:43.259 cpu4:1037)iSCSI: queuecommand 0x3dd025d8 failed to find a session for HBA 0x1ff61d8, (3 0 3 0)

These are suspect errors in the hostd.log after a rescan though:

2008-05-13 10:14:13.963 'Partitionsvc' 49183664 info Error Stream from partedUtil while getting partitions: Geometry Known: 0

2008-05-13 10:14:25.134 'FSVolumeProvider' 12757936 error RefreshVMFSVolumes: ProcessVmfs threw HostCtlException Unable to get FS Attrs for /vmfs/volumes/45a8f531-2cd8c4fd-3541-000d60981fc6

Thanks for your help so far.... do you think its reboot time? or is there anything else we can try?

Will update once ive rebooted.