[gpfsug-discuss] Online data migration tool

[Nikhil Khandelwal]

Hi,

I would like to clarify migration path to 5.0.0 from 4.X.X clusters.  For
all Spectrum Scale clusters that are currently at 4.X.X, it is possible to
migrate to 5.0.0 with no offline data migration and no need to move data.
Once these clusters are at 5.0.0, they will benefit from the performance
improvements, new features (such as file audit logging), and various
enhancements that are included in 5.0.0.

That being said, there is one enhancement that will not be applied to these
clusters, and that is the increased number of sub-blocks per block for
small file allocation.  This means that for file systems with a large block
size and a lot of small files, the overall space utilization will be the
same it currently is in 4.X.X.  Since file systems created at 4.X.X and
earlier used a block size that kept this allocation in mind, there should
be very little impact on existing file systems.

Outside of that one particular function, the remainder of the performance
improvements, metadata improvements, updated compatibility, new
functionality, and all of the other enhancements will be immediately
available to you once you complete the upgrade to 5.0.0 -- with no need to
reformat, move data, or take your data offline.

I hope that clarifies things a little and makes the upgrade path more
accessible.

Please let me know if there are any other questions or concerns.

Thank you,
Nikhil Khandelwal
Spectrum Scale Development
Client Adoption
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