Consider using virtual scsi devices for boot to eliminate this. Strings beginning with 3 , m , or M are treated in the same way as missing. The path status matches status specified with the -s flag. With this flag, the attribute value can be changed without closing the disk and the change takes effect immediately. Even though all paths to the storage are lost, the last path displays the status as enabled.
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Also, note that the lsmpio devvice accepts a -z flag to zero out the error counters. In fact, all of the flags for the lsattr command are supported on the lspath command when displaying path attributes.
This flag is only valid when displaying path attributes and it cannot be used mpo the -D-For -R flag. If your device is not detected, check with the device vendor to determine if a PCM is available for your device. Another new command in AIX 5. The -Z Character flag is used to change the record separator character for each record line of output generated.
Multiple Path I/O
T he queue depth setting in the ODM should be treated as a possible starting point, and may need to be adjusted based on host environment variables.
The PCM KE can select the best path based on a variety of criteria, including load balancing, devixe speed, connection failure, and so on. The connection matches the connection specified with the -w flag. There are several possible combinations of using VIOS with Pure Storage, and the configurations differ depending on which one you are using.
In such a case, an IO mpii indicates the actual loss of the last path to the disk. These metrics are not applicable for tapes. Indicates the pmio of times the service queue becomes full that is, the disk is not accepting any more service requests per second. Only paths with a path status of available also have an operational status.
The following sections discuss the output of various samples of the lsmpio command. The command has several useful options you can pass to it. The CIO option is only intended for applications that implement their own serialization like Oracle. By examining these error counts, the SAN administrator can deduce the SAN fabric components that causes intermittent errors. You can run the current command to check which version of the Pure ODM file you are currently running: Monitor using the fcstat command.
But this shows how errors spread across 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. It may be a problem with that adapter, the fiber connected to the adapter, or perhaps the port on the FC switch that the fiber is connected to.
IBM AIX multipath I/O (MPIO) resiliency and problem determination
Multiple instances of this flag may be used to list multiple attributes. Displays the output in a user-specified format, where the Format parameter is a quoted list of column names separated by non-alphanumeric characters or white space. This may be useful for determining if mlio problem is still occurring or if a problem has been resolved. Reboot, as prompted by the tool.
AIX Configuration Best Practice – Hitachi Vantara Knowledge
Please contact Hitachi for specific instructions on changing boot disk definitions. Sign in or register to add and subscribe to comments.
It also introduced some new features to the AIX operating system that I thought were worth exploring and discussing further. Indicates the minimum time spent by a transfer request in the wait queue.
The lsmpio command implements the -a and -r flags to show the local and remote FC ports used by the disks. Strings beginning with 1aor A are treated in the same way as available. Strings beginning with 0dor D are treated in the same way as defined. The commands per port is by physical port. All users can execute this command.