Poor performance observed when a llt link is disconnected on InfoScale 7.4.1/rhel7.7 with FSS on AWS
Article ID: 100046978
Updated On:
Description
Error Message
Cause
On UDP multiport when one of the links is deleted, socket cleanup doesn't happen. As a result LLT tries to send data on the stale socket/link leading to huge re-transmission and performance degradation.
Resolution
This issue is already fixed in InfoScale 7.4.2.
A hotfix for this issue is available for InfoScale 7.4.1 and can be obtained from Veritas Support.
However it should be noted that there is a known issue with this hf which occurs in the following scenario:
Adding new Link dynamically/run time through lltconfig command
eg.
lltconfig -t devtag -d device -b udp [-s port] [-m mtu] -I IPaddr -B beast
If one or more links are added dynamically to LLT, the link will be added, but UDP multiport will not use them. UDP multiport will keep using old links if they are not disabled.
Important Note:
UDP multiport makes use of links provided at the time of configuration only (links mentioned in /etc/llttab).
There are plans to fix this known issue with the hf, but as yet there is no timeframe as to when this will be completed.
Issue/Introduction
Additional Information
