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Any concerns using Dual-Directional SRDF actions on switched Fibre?
Hi All,
I am currently implementing SRDF/S between 2 Vmax's using Brocade DS-5300B switches. Configuration is 2 RF ports per VMax, each one going to a different switch. Then the switches communicate across the link, so 4 switches total. So now we want to use Primary Databases at both sites, and RDF in both directions. I remember back in the old days of ESCON there were performance issues in bi-directional that were addressed by using Dual-Directional and dedicating lines and so forth. Hosts are ESx servers. It's stright thru FC between switches, not FCIP.
So while I believe the answer is no, are there any issues or gotchas in a switched Fibre Dual-Directional configuration I need to be aware of? Or can I just assign R1s and R2s on both sides and be done with it?
Thanks for any input.
Chris
PedalHarder
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December 14th, 2010 15:00
You are right in that FC is peer to peer, and no performance overhead in writing from either end of the link. Unlike Escon which has a master - slave relationship and writing from the slave end produced a performance overhead.
Provided that your arrays are sized to handle both local and remote writes you should have no difficulty in having R1 and R2 at each site. Is it open systems?
You may want to consider how device group management is performed. I suggest choosing one side to do all DG management, then replicating the DG's via GNS. R1 DG's automatically become R2 on the remote array and vice versa. Have a look in the Grouping Devices section of the Solutions Enabler Symmetrix Array Management CLI product guide to see how GNS can work for you.