AIX MPIO DEVICE DRIVER

The SAN administrator could make a hardware change, run lsmpio -az to zero out the error counters, then wait a few minutes before running lsmpio -are again. Comments Sign in or register to add and subscribe to comments. If multiple hosts do share a port, consider using Priority Port Control to limit the workload of the non-critical servers. Similar to the first case, this indicates an issue with one particular FC port, but this time the problematic port is on the storage device. A PCM can support one or more specific devices.

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AIX Configuration Best Practice

When displaying path information, the allowable values for this flag are: Also, note that two different storage device ports have errors indicating that the issue is not associated with edvice single port on the storage device. Displaying Path Status with the lspath Command. Examples Examples of displaying path status: X We use cookies to optimize your visit to our website. The name description can be used to obtain a display of attribute descriptions and user-settable can be used to obtain an indication as to whether aux not an attribute can be changed.

If outstanding commands sent on healthy paths exist on that device, those commands are canceled by the LUN reset operation.

SAN administrators may use several configuration techniques to maximize redundancy.

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IBM Systems Magazine – New lsmpio Command Provides Better View of MPIO | AIX | IBM Systems Magazine

This may be useful for determining if a problem is still occurring or if a problem has been resolved. A device-specific PCM can have device and path attributes. To use the -H flag with devie -R flag is meaningless; the -R flag prevails. It also introduced some new features to the AIX operating system that I dveice were worth exploring and discussing further. If a component is in some way degraded but still partially functional, it can result in recurring intermittent failures.

IBM AIX multipath I/O (MPIO) resiliency and problem determination

Install the new ODM file Reboot the host. Also notice that the output categorizes the error count into different time ranges. Remove the current ODM file. The second syntax keyed by the presence of the -A flag displays one or more attributes for a single path to a particular MPIO capable device.

Thus if a single adapter fails, the other adapter provides access to the storage device. Each MPIO-capable device driver deviec the paths to a device from its immediate parent or parents.

HBA microcode levels should be check periodically. The attribute values are current values when the -E flag is also specified and default values when the -D flag is specified. For use on versions prior to AIX 6. Displays the legal values for an attribute name.

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Read The Current Issue: Displays the command usage message.

A PCM can support one or more specific devices. Valid column names depends upon the type of information requested. The -s Status flag indicates the status to use in qualifying the paths to be displayed. Immediately I saw that lsmpio was providing me with a lot more information than lspath.

A path stays in the Degraded state from the time it experiences certain errors until there have been five successful health check commands processed on that path.

Strings beginning with 1aor A are treated in the same way as available.

You can use alternative forms of the values. The FC jammer was connected to the fiber from the storage device port to the FC switch. This flag is only valid when displaying path attributes and it cannot be used with the -D-For -R flag.

Indicates the average time dsvice by a transfer request in the wait queue. Notice that fscsi1 has a much higher error count than the error count for the other adapter, fscsi0. Consider using virtual scsi devices for boot to eliminate this.