Hi, I'm doing a master's degree in distributed file systems,
specifically CephFS in HPC, and I have some questions about the metadata
migration process of MDSes that balances the MDS cluster.
* Sage Weil Ph.D. thesis' and the documentation in the Ceph website say
that before migrating to balance the MDS, the first step is to freeze
the subtree and when the migration is complete, to unfreeze it. Doesn't
it affect the performance since the subtree stays unavailable until
migration is over?
* Could you explain why the freezes are required at all?
* Is It possible to change the migration process to migrate a copy of
the inodes and then migrate inodes that have modifications after the
migration? Like taking a snapshot of the subtree and migrate that, and
then migrate any changes that happened after the snapshot migration is
done, reducing the time spent with the subtree frozen.
--
Odair M. Ditkun Jr
Master's networks and distributed systems — University of State Parana
— Brazil
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