" Extended fibre channel link down " log event

Hi all,

I have a question about 2540 M2 storage

storage logs as I am getting event

Severity    : Minor

Date        : Mon Oct 05 11:41:51 KST 2015

Device      : RAID (Sun Storage 2540-M2)

Component   : Host-side: Controller.A.channel.3

Type        : LogEvent

Information : Extended fibre channel link down (greater than one minute)

Event Code  : 93.20.491

Aggregated  : No

Description : 10월 05 11:41:51 RAID Host-side: Controller.A.channel.3: [ID

              0x1019] NOTICE: Extended fibre channel link down (greater than one

              minute)

Probable Cause :

The array firmware has logged an informational event.

What do you mean and occurs ...?

thanks,