User Manual

Advanced Functions
5-10
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.
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.