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VTrak E-Class Product Manual
406
Linux MPIO: Known Issues
With a Fibre Channel switch, a dev_loss_tmo value set too small can result in
loss of the path during failover/failback.
Linux maintains the rports dev_loss_tmo value in the /sys/class/
fc_remote_port/rport-xxxx/dev_loss_tmo file. The Fibre Channel HBA driver
sets this value at loading time.
To change the dev_loss_tmo value to the recommended 60 second value,
during runtime type the “echo” command:
echo 60 > /sys/class/fc_remote_port/rpot-1:0:0/dev_loss_tmo
RHEL-5.2
No Yes multipath-conf-vtrak-normal-rhel5-2
RHEL-5.3
No Yes multipath-conf-vtrak-normal-rhel5-3
RHEL-5.4
Yes Yes scsi_dh_alua_Vtrak-1-1.i386.rpm
scsi_dh_alua_Vtrak-1-1.src.rpm
scsi_dh_alua_Vtrak-1-1.x86_64.rpm
multipath-conf-vtrak-normal-rhel5-4
multipath-conf-vtrak-alua-rhel5-4
How to Configure MPIO RHEL 5.4.txt
Item OS Description
1 SLES 11
GMC
OS multipath with SAS interface makes kernel panic.
2 SLES 11
GMC
OS sets default rports dev_loss_tmo value at 10 seconds
resulting in loss of the path during failover/failback.
To fix this problem, increase the value to 60 seconds.
3 RHEL 5.4 With FC switch, HBA driver (such as Emulex 4g, qlogic 8g)
sets rports dev_loss_tmo value too small, resulting in loss
of the path during failover/failback.
To fix this problem, increase the value to 60 seconds.
4 SLES 10
SP3
With FC switch, HBA driver (such as Emulex 4g, qlogic 8g)
sets rports dev_loss_tmo value too small, resulting in loss
of the path during failover/failback.
To fix this problem, increase the value to 60 seconds.
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