System information

Advanced Functions
5-6
• Detailed MPIO device information
Click to display a complete list of MPIO disk information. You will see the following details.
• Configure MPIO Policy Settings
Select the MPIO disk you want to configure, then click Modify to open the configurations window.
1. From the Path Policy drop-down menu, select either Fail-over or Dynamic balance.
• If you select Fail-over mode, specify the preferred working path.
• If you select Dynamic balance mode, specify a weight mode and switch counter.
2. Each option is described as below. Specify the settings for the selected MPIO disk.
3. Click Apply to apply the settings on the selected MPIO disk.
Category Display
Device Name MPIO Disk name
Available Path The available number of paths on the MPIO disk
Host Name The host name or IP address of host where the MPIO device is located
Serial Number The RAID controller model name and serial number
Path Policy The path policy of the selected MPIO Disk
Table 5-1 MPIO device information
• Selected MPIO disk name, weight mode, and
switch counter
• Physical Path ID
• Adapter Name
• LUN ID
• Path Status
• Read/Write (Byte)
• Read/Write (I/O)
• Queue
Path Policy Fail-over: The Read/Write IOs are transferred on the designated Primary (Active)
path. The Passive path takes over the transfer load only when the Primary path is
off-line.
Dynamic balance: The Read/Write IOs on paths are transferred according to the
Weight Mode policy.
Preferred Working Path Select a path as the primary (active) path. The primary path takes the entire IO
transfer load and the un-selected as standby path (passive).
Weight Mode Read/Write IOs: Given path1 has completed x IOs, path2 has completed y IOs and
switch counter has been set to z IOs. Whenever z Read/Write IOs have been
transferred, the transferred IO Counts on each path will be checked. If x > y and the
primary (active) path is on path1, the primary path will be switched to path2 at next
IO. Vice versa, if x < y and current path is path2; the primary path will be switched
back to path1 at next IO.
Read/Write Bytes: Given path1 has transferred x Bytes, path2 has transferred y
Bytes and switch counter has been set to z IOs. Whenever z Read/Write IOs have
been transferred, the transferred Read/Write Bytes on each path will be checked. If
x > y and the primary (active) path is on path1, the primary path will be switched to
path2 at next IO. Vice versa, if x < y and current path is path2; the primary path will
be switched back to path1 at next IO.
Command Queue: Given path1 has x IOs in queue, path2 has y IOs in queue and
switch counter has been set to z IOs. Whenever z Read/Write IOs have been
transferred, the transferred Read/Write IO Queues on each path will be checked. If
x > y and the primary (active) path is on path1, the primary path will be switched to
path2 at next IO. Vice versa, if x < y and current path is path2; the primary path will
be switched back to path1 at next IO.
Round Robin: With switch counter set to z IOs, whenever every z Read/Write IOs
have been transferred, the primary (active) path will be switched to another path.
Switch Counter Specify a counter value for path switching. The range if from 1 to 99.