Maint Commands
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105
[maint] commit
cid
This command only applies to the Windows operating system.
This command instructs the controller to commit its dirty DCBs to persistent
storage (disks). While the controller is processing I/O requests against
underlying disks, an in-transaction bit is set. If a failure (such as power
failure) is experienced, subsequent reads from the disk inform the controller
that an un-clean shutdown took place. This command allows the end user to
complete all pending I/Os on disks and clear the in-transaction bit.
Typical application of this feature is when an application is using a given unit
in raw mode (such as databases) and the user would like to shut down the host
(including UPS post failure automations). This command expedites the
process by instructing the controller to finish pending requests and clear the
DCBs in-transaction flag as the disk is going down.
Note that block devices (cooked devices) do not require this command.
Clients of block devices (such as File system) send such requests via ASPI
SRB_SHUTDOWN_REQUEST.
