ps6100e Warning on all eth0 Members network port.

HI,

I have one group of 5 dell EqualLogic "PS6100e and xv"
but recently i received this mail every day for the all  ps6100 and always  the same network card (eth0) for all the members

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This message was generated by the Dell EqualLogic SAN= Headquarters service (version 3.0.0.7189) running on xxxxx

The following condition on Group xxxx  (xx.xx.xx.xx) has generate= d an alert notification:

Warning conditions:

• = 06/06/2016 04:52:52 to 06/06/2016 05:08:56
  
  • [I= D: 3.23] Warning: Member xxx network port, eth0, cannot= be reached.  Unable to obtain network performance data for = the member.
  • Condition already generated an e-mail= message. If the condition persists, additional messages will be= sent approximately every 6 hours.

= NOTE:To customize e-mail alert notification launch an instan= ce of the SAN=0D=0AHeadQuarters Client then:=0D=0A=0D=0A

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i've worked with this group at least 2 years and 2 months ago ... i received this mail from my Dell SAN HQ and i don't understand why !

Thank you !