Using diagnostic support tools – HP MSL6000 Series User Manual
Page 140
Troubleshooting
140
Using Diagnostic Support Tools
This section describes diagnostic tools available to help troubleshoot and maintain your tape library.
Library Performance
HP-UX host responds slowly, or crashes
after connecting to the library.
•
Check the SCSI IDs of all devices on the host busses
to ensure there are no conflicts.
•
Check that the application software does not require
SCSI IDs to be in a certain order.
•
Contact your authorized service provider.
The library is not efficiently backing up
data.
•
Check the network bandwidth from the target to the
host computer.
•
Check that the library’s drives are on their own SCSI
bus, and not daisy-chained to another tape drive,
hard drive, or other high bandwidth device.
•
Check that the server and file system have the
processing power and memory needed to stream the
tape drive.
•
Ensure that other applications are not taking up
bandwidth from the backup server or target
workstations.
•
Ensure the server has a fast enough file system (i.e.
RAID).
•
Ensure that the drive is clean.
•
Try a new tape. A marginal tape can cause
performance problems due to bad spots on the tape,
requiring retries.
•
Ensure that the application software is using
fixed-length records (or blocks) to maximize
throughput, and has not defaulted to a smaller
record size. (64K should be sufficient.)
•
Ensure that the data is being compressed, however
do not turn on both software and hardware
compression. (In most cases, hardware compression
should be enabled.)
•
Check the size of the files. Backing up several small
files can impact performance.
Table 11
Troubleshooting General Problems (continued)
Problem
Solution