Re: How to cable two ESLS disk expansion units to our new EMX0 expansion unit.

The EJ14 is a x8 card so all slots are the same to it.

In some older drawers there were airflow considerations but those usually came after new cards were introduced that the original drawer design didn't address. Here I don't think that's an issue.

My personal preference here is to leave open slots that you CAN access in the case you need to add cards in the future. So if you cabled C1 and C3 together leaving C2 open now you have a difficult time adding a card into C2 later as both have cables and some cables go between them. Leaving C1 or C6 open would make inserting a card simpler.

I think that is a higher consideration than expecting better performance or redundancy by card placement.

- Larry "DrFranken" Bolhuis

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On 7/19/2017 9:01 AM, Rob Berendt wrote:

Any reason to move these? Like move C3 to C2 and C6 to C5? Like did IBM
place them there for a reason? I have someone else telling me his
personal preference would be to C1-C4 and C2-C5. I could see moving them
if you were using REALLY short cables and cabling them to their adjacent
cards. However I don't see any benefit to moving them when you're not
cabling adjacent cards.
He did mention "personal preference".

I do notice a little difference between those slots at the diagram listed
below though
https://www.ibm.com/support/knowledgecenter/en/8286-42A/p8eab/p8eab_emx0_slot_details.htm


Rob Berendt