[Beowulf] Migrating from IB datagram mode to connected mode live ?

[Christopher Samuel]

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Hi folks,

For hysterical raisins we have an IBM iDataPlex system which is
running QDR IB in datagram mode.  To that IB network we'll be adding
another QDR system which can only run in connected mode.

The kicker is that our IB network is used for GPFS over IPoIB and so
our NSD's will need to move to connected mode for the new system.

I've been Googling without success to find out if you can do such a
migration live (i.e. change the servers to connected mode, increase
their MTUs and then migrate clients to connected mode (we have enough
redundancy in servers to do this) or whether we'll need to schedule an
outage and take the whole system down and bring it back up in
connected mode.

Any thoughts?

cheers,
Chris
- -- 
    Christopher Samuel - Senior Systems Administrator
 VLSCI - Victorian Life Sciences Computation Initiative
 Email: samuel at unimelb.edu.au Phone: +61 (0)3 903 55545
         http://www.vlsci.unimelb.edu.au/

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