Manual

Reading the trace log
The failover driver maintains an internal buffer of the most recent significant events.
To read the trace log, cat the ‘trace’ file. For example:
cat /sys/bus/scsi/drivers/pfo/trace
Library path failover events
When the library detects a path failover, it generates an appropriate event. Path failover events
do not always occur immediately following a path break. The device driver will wait until a
command is sent, and if the path is still failed, the device driver will perform the failover actions
and the library will report the event immediately after the failover. See the library user guide for
accessing and interpreting support tickets and log files.
• “ESL G3 events related to advanced path failover” (page 60)
• “MSL6480 events related to path failover” (page 60)
• “1/8 G2 Tape Autoloader and other MSL libraries events related to path failover” (page 61)
Table 6 ESL G3 events related to advanced path failover
DescriptionEvent
A library control path failed and a failover operation to a redundant control
path drive succeeded.
Library Control Path Failover
A library control path failed and a failover operation to a redundant control
path did not succeed. The library control path is not operational.
Library Control Path Failover Failure
A drive data path connection failed and a failover operation to the
redundant drive port succeeded.
Drive Data Path Failover
A drive data path connection failed and a failover operation to the
redundant data port failed. The drive data path is not operational.
Drive Data Path Failover Failure
A drive communication failure occurred which prevents drive control and
library control path operations.
Drive Control/Communication Failure
Table 7 MSL6480 events related to path failover
Details and solutionMessage and descriptionEvent code
Verify that both FC ports are correctly cabled to the
SAN.
Loss of redundant data path.4037
Advanced path failover, ADPF and ACPF, are only
supported on LTO-6 and later generation tape
The drive configuration failed because of
unsupported ADPF features selected.
4038
drives. Disable advanced path failover for this drive
or replace it with a drive supporting this feature.
The drive configuration failed because of
unsupported ACPF features selected.
4039
Check the cabling and all network components
between the affected drive and host computer.
Data path failover occurred.4040
If the failover was unplanned or unexpected, verify
that the host still sees both the active and passive
Control path failover occurred. This event applies
to Advanced CPF.
4043
drives. If necessary, reconfigure a different passive
drive for the partition.
Check the cabling and all network components
between the affected drive and host computer.
Disable path failover or install the necessary failover
license.
The drive configuration failed because of missing
DPF license.
4046
The drive configuration failed because of missing
CPF license.
4047
60 Troubleshooting failover operation