Multi Hop SRDF using Raid-5 Devs

Question

I am attempting to setup a multi-hop between 3 DMX-2's all 5671 code for migration and DR purposes. Site 1, symm 1, R1 devs SRDF/Asynchronous to : Site 2, symm 2, R2 dev then i'm setting up R1/BCVs, established to above R2 devs, with SRDF/A link to: Site2, symm 2, R2 devs, with Gold copy BCV's the problem i get when using manual groups is that after i mirror the R1/BCVS to the R2s in site 2, when i go to re-establish my link , i get the message 'cannot use the device for theis function because it is a Copy Session Target' Can this be done with all Raid-5 devices. I've studied the pictures in SE 6.4 guide, pg 133 but's it's pretty confusing. Will the use of a single device group elimenate the copy session target error? thanks

SKT2 · Answer

i got the same errors when tried to sync the r1-BCVs while there was a couple of disk failures .

rawstorage · Answer

WilsonG,

From the RDF Product Guide, this is a documented restriction (section: Setting Snap and Clone devices to Asynchronous mode):

"Note: If the R2 device is a source or target of a snapshot operation, asynchronous mode will not be allowed."

You are using RAID5 BCV,therefore Clone Emulation is enabled.

R1---R2---R1/R5BCV------R2----R5BCV
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Can't establish this link here as R2 is Clone source to R5BCV, you could possibly use adaptive copy disk mode here to get around this.

wilsonG1 · Answer

the SAC team was kind enough to burst my bubble, as they said this would not work. I would need mirrored R1-BCVs to work the way i wanted it to.thanks

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