[gpfsug-discuss] storage-based replication for Spectrum Scale

Alex Levin alevin at gmail.com
Wed Jan 24 07:30:15 GMT 2018


Hi,

We are using a  similar type of replication.
I assume the site B is the cold site prepared for DR

The storage layer is EMC VMAX and the LUNs are replicated with SRDF.
All LUNs ( NSDs ) of the gpfs filesystem are in the same VMAX replication
group to ensure consistency.

The cluster name, IP addresses ,  hostnames of the cluster nodes are
different on another site - it can be a pre-configured cluster without
gpfs filesystems or with another filesystem.
Same names and addresses shouldn't be a problem.

Additionally to the replicated LUNs/NSDs you need to deliver copy
of /var/mmfs/gen/mmsdrfs  file from A to B site.
There is no need to replicate it in real-time, only after the change of the
cluster configuration.

To activate  site B - present replicated LUNs to the nodes in the DR
cluster and run  mmimportfs as "mmimportfs  fs_name -i copy_of_mmsdrfs"

Tested  with multiples LUNs and filesystems on various workloads - seems to
be working

--Alex


On Wed, Jan 24, 2018 at 1:33 AM, Harold Morales <hmorales at optimizeit.co>
wrote:

> Thanks for answering.
>
> Essentially, the idea being explored is to replicate LUNs between
> identical storage hardware (HP 3PAR volumesrein) on both sites. There is an
> IP connection between storage boxes but not between servers on both sites,
> there is a dark fiber connecting both sites. Here they dont want to explore
> the idea of a scaled-based.
>
>
> _______________________________________________
> gpfsug-discuss mailing list
> gpfsug-discuss at spectrumscale.org
> http://gpfsug.org/mailman/listinfo/gpfsug-discuss
>
>
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