Understanding EVA4400

[Jenny2012]

Hi all,
we have a EVA 4400 with 8 Enclosures and a new EVA 8400 with 9 Enclosures.
I noticed that the Enclosure cabling of the 4400 differeent from the 8400. At 4400 Loop A and Loop B goes from Controller 1 to the first enclosure an from the last enclosure back to controller 2.
At 8400 Loop A is the same but Loop B goes from crontoller 1 to the last enclosure in rack and from the first enclosure back to controller 2....
Thanks !

[Prakash Singh_1 · Accepted solution]

Hi,

Kindly chk the eva4400 cabling seems to be done wrong


Rgds

Prakash

[Jenny2012]

I checked the EVA 4400 Installation Guide.
The installation guide describes the cabling exactly the way our EVA4400 was cabled..

[Prakash Singh_1]

Then, your description (Loop A and Loop B goes from Controller 1 to the first enclosure) is incorrect ;-)

Kindly chk properly in the HP StorageWorks 6400/8400 Enterprise Virtual Array installation guide

appendix A - cable diagrams


Your cabling is wrong

[Jenny2012]

I`m really sorry. Yes my description was wrong. OK, our 4400 cabling is the same way like Installation Guide shows but our 8400 cabling is differnt.

A last question:
The 8400 is working fine with this cabling.
Could we get any problems with this cabling ? (Performance or Redundancy)

Thanks !

[Prakash Singh_1]

Performance shouldnt be a problem but redundancy could be a fine exit-reason for support as the array does not confirm the vendor's specification.

[Prakash Singh_1]

If this helps kindly assign points...

[Terry.giblin]

Dear Jenny2012,

Now ask your SAN or Network team for a backplane diagram, if you are still unsure.

Before naming ports.

It is designed that way, for a very good reason.

"Some things you just have to do by looking."

[Johan Guldmyr]

Like Prakash said, if you are not having any issues (looked through the controller event log for any back-end loop issues?) then you're fine for now. But if you are going to add more enclosures on the 8400 and it's not too much work then you should probably change the cabling.

If you ever do encounter any back-end loop issues, odds are quite high first tip from HP will be to correct that.