Virtual TapeServer 6.04.03 Operations and Administration Guide

| 163
3. If the No sg devices found message is displayed or partitions are missing, direct the
operating system to rescan for the devices on the Fibre Channel bus(es) from the console
or using a Telnet command prompt. Enter the following commands:
[root@VTS001 root]# cd /usr/local/tape/bin/
[root@VTS001 bin]# ./rescan-scsi-bus.sh -l -c -r -w
Here is the output:
Rescanning /proc/scsi/qla2300/4...
Rescanning /proc/scsi/qla2300/5...
Removing /proc/scsi/qla2300/4, target 0, LUN 32
Scanning /proc/scsi/qla2300/4, target 0, LUN 32
scsi4 00 00 02 JetStor Volume R001 Direct-Access
scsi4 00 00 00 JetStor Volume R001 Direct-Access
scsi4 00 00 01 JetStor Volume R001 Direct-Access
scsi4 00 00 03 JetStor Volume R001 Direct-Access
scsi4 00 00 04 JetStor Volume R001 Direct-Access
If you cannot see the partitions after rescanning the SCSI connections, reboot the VTS
server.
4. Start GFS as documented in Starting GFS on page 154.
VTS server fails to fence
Fencing is a term used to describe when a server is excluded from the GFS cluster. When a
server is not available for updates and cannot vote in the GFS process, it may be fenced off
from access to the file system. You must rejoin that server to the cluster. To verify if fencing is
occurring, complete these steps:
1. Check the /var/log/messages file on the primary VTS server. You may see this message:
“VTS unauthorized to join cluster. Fence failed.”
2. Restart the GFS cluster by bringing GFS down and back up. See Starting GFS on page
154.