Troubleshooting
Implementing nTier Deduplication
97
Requested operations cannot be performed from the Console
Check server
activity
Sometimes the nTier VTL appliance is very busy with operations that cause high
CPU utilization (such as expanding tapes or data
compression).
You can check the Event Log or syslog for messages that show you the current
activity of the system.
If you see messages such as
Server Busy
or
RPC
Timeout
, you should wait awhile
and retry your action after the current operation finishes.
If the problem persists or the server is not really busy, contact technical support.
Console operations are very slow
Check Console
machine
memory usage
On the machine where you are using the VTL Console, use the appropriate system
utility (such as Task Manager) to show the memory usage of all running processes.
If the memory usage is unusual, stop all unnecessary processes from running or
provide more memory.
Check server
activity
Sometimes the nTier VTL appliance is very busy performing heavy processing. You
can check the Event Log or syslog for excessive pending SCSI commands on a
single SCSI queue that may delay update requests coming from the Console. Also,
try starting a second instance of the Console. If the second Console cannot
establish connections, that means the server is busy with previous RPC operations.
If this is the case, you should wait awhile and retry your action after the current
processing finishes.
If the problem persists or the server is not really busy, contact technical support.
Physical resources
The VTL Console does not show physical storage devices as expected
There are several steps to try when physical storage devices have been connected/
assigned to the nTier VTL appliance yet they are not showing in the VTL Console.
Rescan devices
Perform a rescan from the VTL Console (right-click on the
Physical Resources
object and select
Rescan
). Make sure that the
Discover New Devices
option is
specified. Specify a
LUN Range
that you reasonably expect will include the LUN.
Check system
log messages
Check the Event Log or syslog for error messages that may correspond to the
rescan operation and report failures on SCSI devices. It may be that even though
the devices were discovered, they were not accessible due to errors.
Check device
type
For external
SCSI devices
, make sure you check the following:
•
Make sure the system is powered on. Perform a power cycle to make sure.
•
Physically make sure all the cable connectors are securely plugged in.