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. When using “Additional setteing” in Edit Host Group window: Possible values that can appear for the status column are: So how might the SAN administrator use the error count? The -t flag cannot be used with the -F or the -A flags. Each MPIO-capable device driver adds the paths to a device from its immediate parent or parents.
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Keep in mind that you will need to manually make this change anytime you overwrite the ODM i.
MPIO-capable device management
The same rules used by the lsattr command for displaying device attributes applies to the lspath command for displaying path attributes. Select VCS from the Middleware pulldown. Hitachi provided procedures should be followed.
But something associated with that adapter is causing errors. If your device is not detected, check with the device vendor to determine if a PCM is available for your device.
Supported multi-path devices
In order to upgrade to the latest version of the ODM you will need to first remove the old one. The path status simply indicates aixx the path is configured or not. Connecting to one or more ports on each of the controllers protects against the failure of an entire storage device controller.
Note that the lsmpio command depends on support from the PCM. If the error count is zero, then the problem is likely resolved.
The lsmpio command in older technology levels of AIX supports these two flags. By default, this command will display the information in columnar form. More Articles From Chris Gibson.
A path-control module PCM provides the path management functions. And from the AIX chdev man page: Disk Flash Servers Software Tape. Only paths with a path status of available also have an operational status.
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. An MPIO-capable device driver can control more than one type of target device. This example uses the —a option to monitor the adapter as well iostat —aD —d hdisk9 10 Adapter: If multiple hosts do share a port, consider using Devce Port Control to limit the workload of the non-critical servers.
AIX Recommended Settings
Select the “Unique Reseve Mode 1” checkbox. The following calculations are used for each subsystem: The PCM KE can select the best path based on a variety of decice, including load balancing, connection speed, connection failure, and so on. This is an option when creating logical volumes the —e option or maximum range in smit. The -Z Character flag is meant to be used for programs that need to deal with ODM fields that may have embedded new line characters.
Specifies the logical device name of the target device whose path information is to be displayed. Thus the host LPAR detects induced errors on healthy paths.
Displays all attribute names separated by colons and, on the second line, displays all the corresponding attribute values separated by colons. Notice that fscsi1 has a much higher error count than the error count for the other deevice, fscsi0. Best practice is to make the queue depth the same in both the server and client partition.