Greetings,

I'm not sure if this is a PowerPath issue or not but wasn't sure where to start. We have a RHEL4 server connected via SAN to a CX3-40. It run PP 5.1.0. All of this generally works fine.

The other day the admin created a new lun (55 gig) from RG3, assigned it to a server, rescanned the server bus, and then got I/O errors when running a pvscan. Navisphere and host agents were updated. An error like this shows up:
/dev/emcpowerci: read failed after 0 of 4096 at 37580898304: Input/output error

I removed the lun, destroyed it, recreated it and did the same steps. The same error occurs. I took a different lun from RG3 that wasn't assigned to anything, added it to the host and everything was happy. I destroyed the problem lun again, recreated a 1 gig lun, and then a 50 gig lun then showed them to the same host. The 1 gig lun was fine and we got I/O errors on the 50 gig lun. We have tried varying sizes of lun creation. The last was as a 35 gig lun. These errors show up at the end of the dmesg output:

SCSI device sdb: 73400320 512-byte hdwr sectors (37581 MB)
SCSI device sdb: drive cache: write through
sdb: unknown partition table
emcpowerci: unknown partition table

I'm at a loss to figure out what is going on. Any help would be appreciated.

Thanks,

Jeff