AIX MPIO DEVICE DRIVER

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Default is in milliseconds. Install the new ODM file Reboot the host. The default display format can be overridden by using the -F Format flag. Care should be taken when using these settings as the reserves are disabled. The following paragraphs examine and compare the output for different scenarios, providing an example of deducing where in the SAN fabric intermittent errors are being introduced. The PCM KE can select the best path based on a variety of criteria, including load balancing, connection speed, connection failure, and so on. Hitachi provided procedures should be followed.

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Notice that fscsi1 has a much higher error count than the error count for the other adapter, fscsi0. The following paragraphs examine and compare the output for different scenarios, providing an example of deducing where in the SAN fabric intermittent errors are being introduced. Thus the issue must be within the SAN fabric.

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

If outstanding commands sent on healthy paths exist on that device, those commands are canceled by the LUN reset operation. Devide, note that two different deviec device ports have errors indicating that the issue is not associated with a single port on the storage device. Unconfiguring storage adapters Before you can remove or replace a storage adapter, you must unconfigure that adapter. Also notice that the output categorizes the error count into different time ranges.

Note that if the error count for the remote ports is zero or very small, it may indicate that the port is working fine or it may indicate that the port is not currently being used. Thus if a single adapter fails, the other adapter provides access to the storage device.

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Identifies the specific attribute to list. After installing the ODM you will be prompted to reboot. The path status matches status specified with the -s flag. This article discussed those improvements and xevice how a SAN administrator can use the new features of the lsmpio command during problem determination.

Before a device can take advantage of MPIO, the device’s driver, methods, and predefined attributes in the Object Data Manager ODM must be modified to support detection, configuration, and management of multiple paths.

The remaining sections of this article explain these improvements. By examining these error counts, the SAN administrator can deduce the SAN fabric components that causes intermittent errors. Indicates the maximum time spent by a transfer request in the wait queue. Dfvice order to upgrade to the latest version of the ODM you will need moio first remove the old one.

You can now continue adding your subsequent zoned paths and LUN’s. It either displays the operational status for one or more paths to a debice device, or it displays one or more attributes for a single path to a single MPIO capable device.

In this instance, the lspath command is similar to the lsattr command.

Supported multi-path devices

Mpik though all paths to the storage are lost, the last path displays the status as enabled. Heartbeat over disk is supported. This gives an indication if the errors are still occurring or if perhaps there was a temporary issue that has not happened recently.

To use the -H flag with the -R flag is meaningless; the -R flag prevails. 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. The commands per port is by physical port. The PCM KE mpjo select the best path based on a variety of criteria, including load balancing, connection speed, connection failure, and so on.

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Displays the output in a user-specified format, where the Format parameter is a quoted list of column names separated by non-alphanumeric characters devife white space. Mpoo that the lsmpio command depends on support from the PCM.

For example, if the fiber connected to a particular AIX FC port is pulled out, all currently used paths originating at that port move to the Failed state. Our ODM defaults to “round-robin”, so if you would like to take advantage of the shortest-queue setting, you will need to run the following command: 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 or not aox attribute can be changed.

This illustration shows the interaction between the different components that make up the MPIO solution.

AIX Configuration Best Practice

This may be useful for determining if a problem is still occurring or if a problem has been resolved.

I verified this on my lab system running AIX 6. An MPIO-capable device driver can control more than one type of target device.