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

Håkon Bugge h-bugge at online.no
Thu Apr 19 03:04:53 EDT 2012


echo connected >  /sys/class/net/ib0/mode

-h

On 19. apr. 2012, at 03.53, Christopher Samuel wrote:

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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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