ACA is supported starting in Purity 3. Single path reserve, failover only Can be modified to: Include your Hitachi Vantara representative as a key component of any new implementation or change in your environment. Comments Sign in or register to add and subscribe to comments. 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: Those path states make it obvious that there is a failure associated with the link for that particular port, and therefore, it is easy for the user to determine the source of the problem.

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

With this flag, the attribute value can be changed without closing the disk and the change takes effect immediately. There are several possible combinations of using VIOS with Pure Storage, and the configurations differ depending on drvice one you are using. Note that the lsmpio command depends on support from the PCM.

This flag is optional for displaying path status, but it is required for displaying path attributes. Hdisks can be in the same physical disk group. Displays the command usage message. If the target device is a SCSI disk, to display all attributes for the path to parent scsi0 at connection 5,0, enter the following command: Displaying Devie Attributes with the lspath Command.


These metrics are not applicable for tapes. Zoning should be performed at the HBA level.

Supported multi-path devices

Not all devices and attributes support the -U flag. When sharing ports, please note the following: 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.

Gary Domrow Published on February 19, Good SAN zoning practices are critical. The set of user changeable attributes is defined by the device vendor. When using a switch change the fibre channel adapter to enable fast fail and dynamic tracking: Indicates that attributes for a specific path are to be displayed. When I ran the lsmpio and lspath commands on my system, I saw the fevice output:. A PCM can support one or more specific devices.

Changes the characteristics of the device while allowing the device to defice in the Available state.

Multiple Path I/O

mio These attributes have dependencies on settings and features that are provided by the storage subsystem. The -t flag cannot be used with the -F or the -A flags.

So drvice counts, especially large nonzero counts, are more interesting than a small or zero error count. The connection matches the connection specified with the -w flag. For example, you can quickly determine if any errors have been recorded for a device.

Comments Sign in or register to add and subscribe to debice. For example, perhaps the optical source on an FC port is becoming weak, a connection between the fiber and the port of an FC switch is not secure, or some device on a SAN fabric is malfunctioning in a way that is flooding that SAN fabric with extraneous traffic.


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

Sometimes, it might be difficult for the SAN administrator to identify the source of intermittent, recurring errors. Indicates the logical device name of the parent device, whose paths are to be displayed. Select the “Unique Reseve Mode 1” checkbox. Likewise, using multiple FC ports on the storage device protects against the failure of a single port. The enhancements in the new TL attempt to distinguish these induced errors from errors devicee by the SAN issue to better identify the good paths and the problematic paths.

The Hitachi ODM update is a set of predefined attributes to identify disk devices. This is accomplished by using multiple FC ports on both, the computer and the storage device.

Displays the path ID in addition to the current default output. You can deviec the current command to check which version of the Pure ODM file you are currently running: