Troubleshooting
Implementing nTier Deduplication
98
•
Verify SCSI termination. This can be quite involved. If you are not sure, you
may have to contact the manufacturer of the devices and have their
representatives assist with the troubleshooting.
Once the above conditions are verified, determine the SCSI HBA and the proper
driver for it. This can normally be accomplished by going to the website of the HBA
manufacturer. From the server console, make sure the correct driver for the HBA is
loaded properly. If not sure, unload and load the driver again. While doing that, look
into the syslog to see if any error messages have been logged corresponding to the
action of loading the driver. Under some circumstances, the system may need to be
power cycled (not just rebooted) to properly load the drive.
Some
Fibre Channel devices
use VSA (Volume Set Addressing) mode. This
addressing method is used primarily for addressing virtual buses, targets, and
LUNs. If this is the case, make sure to enable VSA on the VTL initiator driver and
use persistent binding. Otherwise, FalconStor VTL cannot manage the storage.
Logical resources
Virtual tapes are displayed as "offline" on the Console
If a physical resource that was used to create the virtual tape is missing, the tape’s
status will be offline (missing segment).
From the VTL Console determine which physical resources comprise this virtual
drive. To do this, highlight the tape in the tree and check the
Layout
tab or look under
the
Storage Devices
object for the
icon. For each physical device, check that:
•
It is turned on
•
It still exists (has not been removed)
•
It is in a normal state and does not show any failure
•
There is no failure at the connection level. Check FC connectivity to VTL to
make sure that each physical resource is accessible.
Tape expansion does not work
Check device
size
Highlight the tape in the Console and check that the
Total Size
field shows the
correct size of the expanded tape device.
Correct size -
check client os
If the Console shows the correct size of the expanded virtual tape, the expansion
has succeeded but the client machine is having trouble seeing the new size.
Make sure the client machine has been refreshed to see the updated status of its
drives. You need to run the utility corresponding to your operating system to rescan
the device and discover its new size.
Once the operating system has recognized the new space on the virtual disk, the file
system or the application on the device has to be expanded also. If the file system or
the application supports expansion, use the corresponding utility to expand it.