TimeFinder / SRDF – Where does the Symm store the parings?

I replied to this on the Yahoo storage board, and wanted to share it.

 Excepting in the case of Dynamic SRDF, the pairings are fixed, having been set by EMC when the CE installs the binfile.  These relationships are more or less hard-coded into the Symmetrix and can’t be changed without breaking the pairs and re-establishing them, whether through the command line (symconfigure) or a new binfile request from EMC.

As far as the device pairings in Timefinder, these pairings are first created in the device group for use with the -g switch (or in a device map file for use with the -f switch).  Once these pairings are made, they are the “default” pairing for each device.  (IE if you issue a general establish or split on a group, the devices will always pair up the same way.)  The only way to break that is to do an establish with a different map file (or device group) usig the -force -full.

As always, I counsel against using -force or -symforce on anything, as it usually means you’re telling the Symm to do something it’s not going to like.

Jesse G.
> Hello,
>
>
> I have a query regarding RDF and BCV synchronization, I want to know
> which file does EMC database refer for SRDF and BCV incremental or for full synchronization??
>
>
> Thank & Regards,
>
> Suhas

2 comments

    • on September 12, 2006 at 9:46 am
    • Reply

    So whats the answer? what is that permanent space where DMX stores pairing information? is it in EPROM of all the FA boards?

  1. It’s stored as a part of the cache. A portion of it is reserved for track tables (invalid track counts), Timefinder and SRDF pairing information.

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