Run this check to ensure the proper setup of LLT.
To run an optional system check for LLT
root
user.
By default, the installsfrac program uses SSH for remote communication. However, to use RSH, specify the -rsh option with the installsfrac program.
Enter the system names separated by spaces on whcih to configure SFRAC: galaxy nebula
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Before continuing, login to all cluster nodes and check LLT links.Each LLT link must:
* Not share a subnet with other LLT links on that system.
* Have speed and autonegotiate settings matching the switch
* Have same jumbo frame settings
* Must have unique MAC addresses
/usr/sbin/lsattr -l 'ent3' -E # to query speed and autonegotiate
/usr/sbin/lsattr -l 'ent3' -E # to query jumbo frame
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For optimal LLT (Low Latency Transport) communication among the cluster nodes, the interface cards on each node must use the same media speed settings. Also, the settings for switches or hubs used for the interconnects must match that of the interface cards. Incorrect settings can cause poor network performance or even network failure.
Guidelines for Auto-negotiation, media speed, and jumbo frame settings for LLT interconnects:
The following paragraphs describe displaying information about the current settings for interface cards and how to modify them if necessary.
To display and set the Ethernet auto-negotiation setting and the media speed
# lsattr -R -l <device_name> -a media_speed
If you receive an error such as:
lsattr: 0514-528 The "media_speed" attribute does not exist
in the predefined device configuration database.
The card is a 10 Mbps card, capable of only 10 Mbps / half duplex.
# chdev -P -l ent0 -a media_speed=100_Half_Duplex
The change in value does not take effect until the system is restarted or the device is rediscovered.