ZFS - CKSUM errors only

Hi
I have 2 ZFS filesystems (Sun M3000 server connected to Clariion external storage vie 2 X HBA's) - ZFS filesytems (1 X mirror - 100GB X2) and the 2nd ZFS is 2 concatenated disks - 100GB + 50GB.

Both ZPOOLS are reporting CKSUM errors only - no READ or WRITE errors. I have cleared the errors a few times, but they re-appear soon after.

The /var/adm/messages has the following errors....

Sep  5 21:21:15 saturn  /scsi_vhci/ssd@g600601609ab12200d2e5fa4fcc96de11 (ssd19)
: Command Timeout on path /pci@0,600000/pci@0/pci@8/SUNW,qlc@0/fp@0,0 (fp2)
Sep  5 21:21:15 saturn scsi: [ID 243001 kern.warning] WARNING: /scsi_vhci (scsi_
vhci0):
Sep  5 21:21:15 saturn  /scsi_vhci/ssd@g600601609ab12200d2e5fa4fcc96de11 (ssd19)
: Command Timeout on path /pci@0,600000/pci@0/pci@8/SUNW,qlc@0/fp@0,0 (fp2)
Sep  5 21:21:22 saturn scsi: [ID 243001 kern.warning] WARNING: /scsi_vhci (scsi_
vhci0):
Sep  5 21:21:22 saturn  /scsi_vhci/ssd@g600601609ab1220018ec52b9cd96de11 (ssd21)
: Command Timeout on path /pci@0,600000/pci@0/pci@8/SUNW,qlc@0/fp@0,0 (fp2)

Any suggestions would be of great help!

thanks
Sam - Durban, South Africa

I would first check if the FC cable is mounted properly into the sockets. Do you have multipathed connection to the storage?

Yes - MPXIO. FC cable is seated properly in HBA ports on server. Should I check the ports on thr fibre switches? Are these errors (CKSUM errors) indicative of loose cabling?

thanks
Sam

Yes, you should check FC switch connection as well. You can also check if the array is not having some problems...

Thanks - will check - at home now. Your assistance is appreciated. Will update in a few hours.

tx Sam

All cables are fine and seated correcly on server and switch ports. I have rebooted the server and still get CKSUM errors on the ZFS filesystem!