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Administrator's Reference
Specifies how mirrored volumes are accessed when the server writes pages to
the recovery log or database during normal processing. The defaults
are:
mirrorwrite db sequential
mirrorwrite log parallel
Syntax
>>-MIRRORWrite--+-LOG-+--+-Sequential-+------------------------><
'-DB--' '-Parallel---'
Parameters
- LOG
- Specifies that this is the mode to be used for writing recovery log pages
- DB
- Specifies that this is the mode to be used for writing database pages
- Sequential
- Specifies that the server writes to the mirrored volume one after
another. Server performance decreases because a successful I/O must
occur before the next write can occur.
- Parallel
- Specifies that the server writes to all mirrored volumes in
parallel. This mode allows all mirrors to obtain the new page at
approximately the same time.
- Note:
- If a system outage occurs at exactly the instant that each mirror is
partially complete in writing its page, a partial write to each mirror could
result.
Examples
Specify that the server writes to all mirrored database volumes in parallel
and to the mirrored log volumes one after another.
mirrorwrite db parallel
mirrorwrite log sequential
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