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Tuesday 8 May 2012

Multipath in Linux

We all know the concept of Multipathing, which is configured for redundancy purpose to ensure the L UN's from the Storage Team is always available at the server.

1) # multipath -l : Command to view the configured multipath devices.

2) # cd /proc/scsi : Location of the HBA file which contains the WWN Number. In Linux, the HBA files are stored as 0,1.... The same numbering notation reflects in the "multipath" output.

3) /etc/multipath.conf : Configuration file for multipath.

4) # multipathd -k : Command which opens the interactive console with the ">" prompt.

>show paths : Command shows all the configured multipaths.
>show maps : Command shows all mapping of LUN.
 

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