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DOCS-556 mongodump cannot be used while database is locked by fsync #294

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Oct 29, 2012
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DOCS-556 mongodump cannot be used while database is locked by fsync #294

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5 changes: 5 additions & 0 deletions source/administration/backups.txt
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Expand Up @@ -371,6 +371,11 @@ the snapshot has completed, use the following command in the

.. include:: /includes/note-disable-profiling-fsynclock.rst

.. warning::

:program:`mongodump` cannot be used while the database is locked
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This is confusing. It can be used while in fsync/lock state. The confusion comes from replication and writes which will block reads (mongodump) and your backup. Newer version of mongod will not cause this situation but I don't think the change made it in to 2.2.0 so currently it may be true that once you fsync/lock + queue a writer that all read will block -- it was true pre 2.2.0 for sure.

If you are using mongodump then you should not use fsync/lock.

with :dbcommand:`fsync` or :method:`db.fsyncLock()`.

.. _backup-amazon-software-raid:

Amazon EBS in Software RAID 10 Configuration
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4 changes: 3 additions & 1 deletion source/reference/mongodump.txt
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Expand Up @@ -197,8 +197,10 @@ Options
.. warning:: Use :option:`--forceTableScan` with extreme caution
and consideration.

operations
.. warning::

:program:`mongodump` cannot be used while the database is locked
with :dbcommand:`fsync` or :method:`db.fsyncLock()`.

.. _mongodump-behavior:

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