On Tue, 27 Nov 2007, Nitin Agrawal wrote:
> I am a relatively new user of the Linux NTFS/FUSE file system,
Welcome!
> so apologies if this question has been already been answered elsewhere.
>
> I need to create several large NTFS partitions (40-200GB) for
> experimentation, which I discard afterwards and start the process again.
Why? What do you want todo?
> Since I don't care about the actual file content but only about time
> taken to create the FS, I want to avoid issuing actual disk writes for
> data blocks. The way I currently do this is by writing a magic number in
> the data blocks at the application level and checking for it in the NTFS
> driver (ntfs_pwrite()). If a block has the magic number, I simply return
> with the number of bytes written, without actually issuing the pwrite().
>
> I verify using iostat that indeed only few blocks (corresponding to
> metadata) are being written to the device when I write a large file
> (1GB). But in terms of time, I notice very little speed up. (17 secs as
> compared to 19 secs)
>
> Am I doing something wrong, or is the performance limited by some other
> factor?
What's your hardware? CPU, RAM? How big blocks do you write? What's the
output of 'vmstat 1' during the test?
Szaka
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