F Eatures And S Ettings - Asus DS300j G2 Series User Manual

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eatures and ettInGs
Features and Settings include the following functions:
• Automatic Load Balancing for Failover Policy
• Load Balance Policy
• Path Verification
• PDO Removal
• Performance Tab Refresh Rate
• Round Robin Count
• Refreshing the Objects
• Viewing System Information
• Saving System Information
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utomatIc oaD alancInG for aIlover
The ASUS Storage MPIO solution can load balance the paths for your LUNs with load balance policy set to
Failover.
With Automatic Load Balancing enabled, the LUNs set to Failover policy are automatically redistributed among
all available paths when:
• A path fails
• A failed path comes back online
• A new path is added
Automatic Load Balancing, when enabled, provides optimal data throughput for LUNs set to Failover policy.
Note that Automatic Load Balancing has NO effect upon LUNs set to Round Robin, Round Robin with Subset,
or Least Queue Depth.
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nAbling utoMAtic oAd AlAncing
To enable automatic load balancing:
From the Operations menu, choose Auto Load Balance.
When you see a check mark beside Auto Load Balance in the Operations menu, this feature is enabled.
See also:
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olIcy
• Viewing LUN Properties
• Viewing LUN Performance Statistics
• Load Balance Policy
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oaD alance olIcy
Load Balance Policy is a method of equalizing the I/O traffic over each path by systematically dividing the load
among multiple paths.
• Failover Policy – No load balancing. With Automatic Load Balancing disabled, the first path discovered is the
primary path. I/Os follow the active path until it fails, then they change to next available path. Each LUN
uses only one active path.
See Automatic Load Balancing for Failover Policy.
• Round Robin Policy – I/Os follow all active paths, changing paths at the specified I/O count. You can set the
I/O count in the General tab of the Advanced Settings dialog box.
If LUN Affinity is enabled do NOT use Round Robin. See "Making Controller Settings" on page 59 or
page 124.
• Round Robin with Subset Policy – One or more paths are designated as standby. I/Os follow all active paths,
changing at the specified I/O count. You can set the I/O count in the General tab of the Advanced Settings
dialog box.
If LUN Affinity is enabled, you can use Round Robin with Subset. See "Making Controller Settings" on
page 59 or page 124.
• Least Queue Depth Policy – I/Os follow the path with the least number of requests queued.
Note that you can enable Automatic Load Balancing for LUNs with policy set to Failover. See Automatic Load
Balancing for Failover Policy.
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hAnging oAd AlAnce olicy ettings
To change load balance policy settings:
1. Do one of the following actions:
• From the Operations menu, choose Change Load Balance Policy.
• In Tree View, highlight a LUN and click the Change Load Balance Policy icon.
• In Tree View, right-click a a LUN and choose Change Load Balance Policy from the popup menu.
The Change Load Policy dialog box appears with the Load Balance Policy tab displayed.
DS300f G2 Series User Manual