If you need to be sure requests would be completed in the order you’ve fired
them you need to provide own serialization
mechanism (usually holding n + 1 request before n would not be completed).
There are too many places in storage stack
(including controller driver, controller firmware and hard drive firmware)
where requests could be reordered.
Regards,
Anton Kolomyeytsev
CEO, Rocket Division Software
-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Mike Penn
Sent: Sunday, January 23, 2005 5:40 PM
To: Windows File Systems Devs Interest List
Subject: RE: [ntfsd] asynchronous writes to a disk, using
FILE_FLAG_OVERLAPPED
I agree its a strange pattern, but its just an example of what may happen.
One of my questions is: while a database, for example, is issuing
asynchronous writes, is it possible that the writes may overlap ?
Mike
-----Original Message-----
From: Maxim S. Shatskih [mailto:xxxxx@storagecraft.com]
Sent: Sunday, January 23, 2005 16:18
To: Windows File Systems Devs Interest List
Subject: Re: [ntfsd] asynchronous writes to a disk, using
FILE_FLAG_OVERLAPPED
I have a problem with asynchronous writes to a disk, when the data
itself is overlapped. Example: write from offset 100 to 200, then write
from 150 to 250
Maybe remaking an app is a better idea? Very strange pattern.
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
xxxxx@storagecraft.com
http://www.storagecraft.com
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