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To transit vsan or not to transit vsan
If mirrorview/srdf ports are dedicated to replication, and those ports are members of a stretched vsan that is used solely for replication is there any point using a transit vsan and IVR?
To my mind introducing them both into this config unnescessrily complicates the design. What am I missing?
I can see the point of using them if a host in one site needs access to an array or tape library in another site, but not if the sole purpose is for replication. If a link goes down replication is dead whether the vsan is stretched or IVR is used.
Is it best practice to use a transit VSAN and IVR in every distance extension?
RRR
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November 19th, 2012 09:00
If you don't have a local replication going on, your thought is correct too. Then there is no point in making it extra complicated.
By the way, did tou notice the "Ask the Expert" discussion which is going on right now? It's about long distance connections and your question would certainly fit the profile for this discussion, so perhaps you'd like to take a look there as well? You can find the ATE here: https://community.emc.com/message/690779
dynamox
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November 19th, 2012 08:00
i have my RDF ports in dedicated "local replication" VSANs and then use IVR over transit VSAN to talk to the other side. My config is slightly different because i have local RDF requirements. IE:
Site A (VSAN 10) , (VSAN 200 transit):
VMAX 1 --- > VMAX 2
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Site B (VSAN 110), (VSAN 200 transit)
VMAX 3
RRR
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November 19th, 2012 09:00
Good point! This way you keep all replicaation traffic seperated from host traffic and so you'll need a transit VSAN.
dynamox
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November 19th, 2012 09:00
you could also have dedicated VSAN just for SRDF ports and stretch that VSAN to the other side, if the link does go/up and down you are not impacting any hosts with fabric convergence ..so i guess that would be an ok option.
RRR
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November 19th, 2012 12:00
Yes, exactly, no harm there since the only impact would be the SRDF ports, but that is down anyway, so no extra disruption. Just don't put any other ports in that VSAN.
ScottHolmanColt
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November 20th, 2012 00:00
Thanks chaps.
I've been thinking about this, and even though the my current requirement is to provide remote replication it doesn't mean that the requirement is static. Local repl, remote tape library, or something similar may pop up in 6 months requiring a redesign. I just as well future proof the design even though it may be excessive for the current requirement. I'll check out the link. thks again.
RRR
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November 20th, 2012 03:00
Very wise of you !
Symmetrix_
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November 20th, 2012 05:00
Hello all , currently I have SRDDF/S and SRDF/AS between two boxes, im thinking to replicate the data to another region using SRDF/AD , I have the RDF ports in dedicated VSAN. Im planning to add the new box RDF port to the same VSAN and create new FCIP tunnel whith no IVR if I have a connection issue between the regions and the link went down this will cause both tunnels to be down ? or just the new one.
Thnx,
RRR
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November 20th, 2012 05:00
The remaining link might briefly suffer from a lost link to another region. I’d advise you to use a new separate VSAN for each region you’re connecting to.
Symmetrix_
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November 20th, 2012 06:00
I agree but new VSAN will require new RDF port and new director. Shall i consider IVR ?
RRR
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November 20th, 2012 06:00
Ah, you’re using the same ports! In that case I would use IVR + transip VSANs.
dynamox
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November 20th, 2012 06:00
new engines ?
Yes, IVR requires enterprise license.
Symmetrix_
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November 20th, 2012 06:00
This must be cost effective and much easier than adding new engines , this require to have enterprise cisco licenses right?
dynamox
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November 20th, 2012 07:00
free ports to do what ?
dynamox
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November 20th, 2012 07:00
ahh..ok, yes ports at both sites have to be in the same VSAN so fabric will merge. Make sure these VSANs have unique domain id.