Journal and archive location
For recoverability, the live journal should not be on the same physical
device that contains the db.*
files. Separating the live
journal and the db.\*
files also improves performance.
During operations that write to the db.*
files, entries are
written to the live journal as records are written to the
db.\*
files. If the live journal and the db.*
files are on the same physical device, the I/O throughput to the
db.\*
files is degraded. For best performance, the live
journal should be on a separate storage subsystem connected to a separate
host adapter. The live journal should be on a logical drive and
filesystem that is optimized for sequential writes.
The versioned files should be located on a separate logical drive than
the logical drives where the db.*
files and the live journal
are located. For best performance, the logical drive where the versioned
files are located should be on a separate storage subsystem connected to
a separate host adapter. Since the versioned files typically require
significantly more disk space and the I/O throughput is not as critical
as for the db.\*
files, a more economical RAID
configuration, such as RAID 5, can be used for the logical drive where
the versioned files are located.
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