Potential Remote Copy Link Problem with VLE 1.4.1 Microcode (Doc ID 1668354.1)

Last updated on MAY 01, 2014

Applies to:

Sun Virtual Library Extension (VLE) - Version 1.4 to 1.4 [Release 1.0]
Information in this document applies to any platform.

Symptoms

Problem Description:

This potential problem applies only to VLEs running VLE 1.4.1 code with 3, 6, 9 or 12 remote copy links.

The problem was introduced in VLE1.4.1 and affects remote copy link load balancing.  If the VLE has exactly 3 remote copy links defined, the data transfer load will drift to using only a single link for data transfer, while using the other 2 links for metadata transfers only.  Because metadata transfers are small, from the GUI 'Port Status' tab it appears as if only a single link is being used.  This same load balance anomaly also appears if exactly 6 copy links are defined; the data transfer load eventually shifts to using only 3 of the 6 links, transferring only metadata on the remaining 3 links.  Similar behavior can be seen if 9 or 12 remote copy links are defined.

If you have 2,4,5,7, 8, 10 or 11 links defined the load balancing works okay.

An improperly configured link can also cause this error condition. For example if you have two valid links defined and an invalid link (inoperable copy link), the total links defined to the node will be three, and the faulty logic will be invoked.  Please ensure that all copy links defined are operable using the 'Test Remote VLE' button in the Port Card Configuration tab of the VLE GUI.

Cause

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