Hi,
I am a relatively new user of the Linux NTFS/FUSE file system,
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.
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?
Can anyone suggest what would be the best place to intercept data writes and
suppress them?
thanks
Nitin
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