Dell EqualLogic PS6100 series Configuration Manual page 90

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If you have predominately 1Gb initiators, start upgrading your arrays to 10Gb for comparable
or better performance across almost all situations.
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If you have predominately 10Gb initiators, you should only access data and volumes residing
on 10Gb arrays (from those initiators). You may see high latency and retransmit rates when
10Gb initiators connect to 1Gb targets.
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When adding 10Gb arrays, place them in separate pools from your 1Gb arrays.
March 2013 Dell EqualLogic Configuration Guide v14.1 8-81