Hi,
Windows scsi port error might occure due to the scsi bus timeouts.
A SCSI bus timeout occurs when either the SCSI controller or the SCSI device detects that a command has not been responded to within a specific timeout period. Normally, commands are issued by the SCSI controller, which then waits for a response from the device being addressed. If no response is detected, the controller may reset the bus to reinitiate communication. While disk drives normally recover well from SCSI bus timeouts and resets, tape drives have much greater difficulty in doing so.
Normally, these timeout values are large enough to accommodate any delay, including retries, in executing the specific command being attempted. In the event that the device does not respond in the amount of time indicated by the timeout value, a timeout occurs.Usually, the first indication of a timeout is that the tape drive ceases activity. However, because some operations can take several hours on some tape drives, some timeout values are very long, which can make it seem as if the program itself has stopped responding, or that there is an application error of some kind
try these ones:
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check configuration on the SCSI controller.
Set the tape drive SCSI ID as low as possible, avoiding 0 or 1, which are usually reserved for bootable devices
Set INITIATE WIDE NEGOTIATION to off for controllers with a wide bus
Set INITIATE SYNC NEGOTIATION for the ID of the tape drive to off
WARNING: The Parity Checking adjustment is for diagnostic use only and should never be left disabled during production backups
Recommendations:
1. Check for firmware and driver updates from controller and tape drive vendors
2. Use good quality cabling that follows the SCSI specification
3. Use heavy duty shielded cables for external cables. An external SCSI cable should never be detached from any connection while power is still applied to any device on the bus.
4. For single-ended internal cables, ensure that there is at least 1 foot of cable between devices. For single-ended buses, ensure that the overall cable length from termination to termination does not exceed the maximum bus length of 3 meters (roughly 9 to 10 feet)
5. Use active termination on both ends of the SCSI bus. All external devices should be set to supply termination power.
6. Make sure that no two SCSI devices are sharing the same SCSI ID
7. Verify that there are no mirrored, duplexed, striped, or any other RAID configurations on the same SCSI bus that the tape drive is on
8. Do not use SCSI RAID controllers for tape devices
9. Clean the tape drive. Refer to manufacturer's procedures for cleaning the tape drive.
10. Verify that the manufacturer of the tape drive supports the tape brand being used
11. Verify that the tape device and SCSI controller are supported by CA for Windows Servers
12. Apply all the patches from CA to have the latest build
and make sure that windows drivers for the drive is disabled and removable storage service is disabled in the control panel
Set MAXIMUM SYNC TRANSFER RATE to the slowest possible setting
DISCONNECT must be enabled for all tape drive SCSI IDs
Set SCSI PARITY CHECKING to off
Last resort:
1. Put the tape device on a separate controller by itself
2. Have the media replaced
3. Have the tape drive replaced
4. Replace the controller that the tape drive is connected to
5. Try another PCI slot on the motherboard
Good Luck!!!
Cheers