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Displaying Path Status with the lspath Command. Different suffixes are used to represent the unit of time. Occasionally there are ptfs that affect performance. And from the AIX chdev man page: For path display, column names from the CuPath object class can be specified. Unconfiguring async adapters You can unconfigure an async adapter.

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It is not a driver. In order to upgrade to the mpo version of the ODM you will need to first remove the old one.

Multiple Path I/O

This also indicates a possible problem with the local FC adapter. When no flags are specified that qualify xix paths to display, the format of the output is: Another feature mentioned in the IBM article was the new —U flag for the chdev command.

Changes the characteristics of the device while allowing the device to remain in the Available state. To compound the issue, some error recovery actions may cause errors to occur on paths that are actually healthy.

Also, note that two different storage device ports have errors indicating that the issue is not associated with a single devic on the storage device. I encourage you to read the documentation for this command on the AIX Information Center to learn more.


Strings beginning with e or Mmpio are treated in the same way as enabled. Microcode can be downloaded from: More Articles From Chris Gibson. I highly recommend you take the time to read this article in full.

AIX Configuration Best Practice

The enhancements in the new TL attempt to distinguish these aiz errors from errors caused by the SAN issue to better identify the good paths and the problematic paths. To check the priority for each path, use the lspath command as follows: If a path is not currently configured into the device driver, it does not have an operational status. Installing any of the Hitachi ODM updates requires a reboot.

The default display format can be overridden by using the -F Format flag.

The remaining sections of this article explain these improvements. This is accomplished by using multiple FC ports on both, the computer and the storage device. Displays headers above the column output.

All fields are shown by default. The new improvements, include the following items:. 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.

Supported multi-path devices

This simulates the failing components in different parts of the SAN. In this case, I had somewhat artificially plugged two of the storage device ports into a second switch, and inserted the jammer in the link between the switches [the inter-switch link ISL ]. This illustration shows the interaction between the different components that make up the MPIO solution.


When using a switch change the fibre channel adapter to enable fast fail and dynamic tracking: But this shows how errors spread pmio multiple ports on both the AIX end of the connection and the storage end of the connection indicate an issue exists within the SAN fabric.

Using multiple paths might provide m;io bandwidth, but more importantly multiple paths provide redundancy to protect against failures of SAN fabric components. Indicates the maximum time spent by a transfer request in the wait queue.

This output shows the current link state, and then a count of errors that occurred on the adapter. Also notice that the output categorizes the error count into different time ranges.

MPIO-capable device management

Hitachi provided procedures should be followed. Strings beginning with 0dor D are treated in the same way as defined.

Further problem determination requires knowledge of the SAN fabric topology.