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Administrator's Reference

MIRRORWRITE

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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