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-==========================
- Journal Config Reference
-==========================
-
-.. index:: journal; journal configuration
-
-Ceph OSDs use a journal for two reasons: speed and consistency.  
-
-- **Speed:** The journal enables the Ceph OSD Daemon to commit small writes 
-  quickly. Ceph writes small, random i/o to the journal sequentially, which 
-  tends to speed up bursty workloads by allowing the backing filesystem more 
-  time to coalesce writes. The Ceph OSD Daemon's journal, however, can lead 
-  to spiky performance with short spurts of high-speed writes followed by 
-  periods without any write progress as the filesystem catches up to the 
-  journal.
-
-- **Consistency:** Ceph OSD Daemons require a filesystem interface that 
-  guarantees atomic compound operations. Ceph OSD Daemons write a description 
-  of the operation to the journal and apply the operation to the filesystem. 
-  This enables atomic updates to an object (for example, placement group 
-  metadata). Every few seconds--between ``filestore max sync interval`` and
-  ``filestore min sync interval``--the Ceph OSD Daemon stops writes and 
-  synchronizes the journal with the filesystem, allowing Ceph OSD Daemons to 
-  trim operations from the journal and reuse the space. On failure, Ceph 
-  OSD Daemons replay the journal starting after the last synchronization 
-  operation.
-
-Ceph OSD Daemons support the following journal settings: 
-
-
-``journal dio``
-
-:Description: Enables direct i/o to the journal. Requires ``journal block 
-              align`` set to ``true``.
-              
-:Type: Boolean
-:Required: Yes when using ``aio``.
-:Default: ``true``
-
-
-
-``journal aio``
-
-.. versionchanged:: 0.61 Cuttlefish
-
-:Description: Enables using ``libaio`` for asynchronous writes to the journal. 
-              Requires ``journal dio`` set to ``true``.
-
-:Type: Boolean 
-:Required: No.
-:Default: Version 0.61 and later, ``true``. Version 0.60 and earlier, ``false``.
-
-
-``journal block align``
-
-:Description: Block aligns write operations. Required for ``dio`` and ``aio``.
-:Type: Boolean
-:Required: Yes when using ``dio`` and ``aio``.
-:Default: ``true``
-
-
-``journal max write bytes``
-
-:Description: The maximum number of bytes the journal will write at 
-              any one time.
-
-:Type: Integer
-:Required: No
-:Default: ``10 << 20``
-
-
-``journal max write entries``
-
-:Description: The maximum number of entries the journal will write at 
-              any one time.
-
-:Type: Integer
-:Required: No
-:Default: ``100``
-
-
-``journal queue max ops``
-
-:Description: The maximum number of operations allowed in the queue at 
-              any one time.
-
-:Type: Integer
-:Required: No
-:Default: ``500``
-
-
-``journal queue max bytes``
-
-:Description: The maximum number of bytes allowed in the queue at 
-              any one time.
-
-:Type: Integer
-:Required: No
-:Default: ``10 << 20``
-
-
-``journal align min size``
-
-:Description: Align data payloads greater than the specified minimum.
-:Type: Integer
-:Required: No
-:Default: ``64 << 10``
-
-
-``journal zero on create``
-
-:Description: Causes the file store to overwrite the entire journal with 
-              ``0``'s during ``mkfs``.
-:Type: Boolean
-:Required: No
-:Default: ``false``