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ceph/doc/dev/delayed-delete.rst
Tommi Virtanen 81feae12e1 doc: Add misc explanations of Ceph internals from email.
Signed-off-by: Tommi Virtanen <tommi.virtanen@dreamhost.com>
2011-12-14 11:19:00 -08:00

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=========================
CephFS delayed deletion
=========================
When you delete a file, the data is not immediately removed. Each
object in the file needs to be removed independently, and sending
``size_of_file / stripe_size * replication_count`` messages would slow
the client down too much, and use a too much of the clients
bandwidth. Additionally, snapshots may mean some objects should not be
deleted.
Instead, the file is marked as deleted on the MDS, and deleted lazily.