[gpfsug-discuss] Online migration

[Rafael Cezario]

Hello,

I have a Spectrum Scale cluster with 10 nodes on the version 4.2.
The cluster have maxblocksize=DEFAULT.
I will migrate all nodes to 5.0.3 (online) none downtime.

But the maxblocksize is fixed on the mmlsconfig after the migration (the 
man have this information)

maxblocksize 1M

man mmchconfig
Note: When you migrate a cluster from an earlier version to 5.0.0 or 
later, the value of maxblocksize stays the same. However, if maxblocksize 
was set to DEFAULT in the earlier version of the cluster, then migrating 
it to 5.0.0 or later sets it explicitly to 1 MiB, which was the default 
value in earlier versions. To change maxblocksize to the default value 
after migrating to 5.0.0 or later, set maxblocksize=DEFAULT (4 MiB).

How Can I perform non-stop migration and after migration create a new 
filesystem with blocksize = 4MiB?

My question is about finishing the migration and create a new filesystem 
with block size set to 4 MiB, its won't be possible until the maxblocksize 
changes.
In a environment where all migration will be done without stopping the 
cluster, my question was if there was any alternative 
This behavior forces the entire cluster to stop.


Regards,

Rafael Cezário Damásio Cunha
IT Specialist - PowerVM/AIX/Spectrum Scale
Technology Support Services
Global Technology Services




Mobile: 55-6198122-4435
E-mail: rafael.cezario at ibm.com
Scn Quadra 4, Bloco B, n.100
Brasilia, DF 70714-900
Brazil


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