3.7.0 HP StorageWorks HP Scalable NAS File Serving Software command reference guide HP Scalable NAS for Linux (AG513-96003, October 2009)
Set the active target on the specified device.
mpiostat [-l] [<psddev> ...]
List the number of transient errors for each target and show the number of failovers
and fatal errors for each device.
mpioload [-l] [interval [count]] [<psddev> ...]
Shows the load for each target (SCSI command I/Os) and total for the PSD
device (block layer I/Os), number of failovers, and fatal errors for each device.
iostat [-u] [interval [count]] [<psddev> ...]
Show general I/O statistics for each device.
rawstat [interval [count]] [<psddev> ...]
Dump general I/O statistics for each device in a raw format.
Enable or disable failover for a server
A cluster server can use multiple FC ports to connect to the Fibre Channel fabric. If
the FC port or FC switch currently being used for I/O should fail, HP Scalable NAS
will by default fail over the I/O to another FC port/FC switch path.
You can use the following command to control whether this failover behavior can
occur on a particular node. Run the command on the server where you want to
change the failover behavior. (HP Scalable NAS starts with failover enabled.)
# mxmpio enableall|disableall
Enable or disable failover for a PSD device
When a failure occurs in the I/O path to a particular PSD device, HP Scalable NAS
will by default fail over to another I/O path. You can use the following command to
control whether this failover behavior can occur for specific PSD devices. HP Scalable
NAS starts with failover enabled.
# mxmpio enable|disable [<psddev ...>]
Specify the path for I/O
If you are troubleshooting problems with an I/O path, you may want to direct the
I/O to another I/O path. You might also want to manually balance I/O paths on a
per-server basis across the cluster. This is possible because mxmpio's controls are
server specific.
Cluster commands46