Fargusson.Alan wrote:
> Doing a dd on a device goes through the cache, so in this case the cache 
> can't be the problem.

Really?

dd is designed to work on block devices that are not mounted, as well as
files within a mounted filesystem.

I thought the VFS only cached mounted filesystems?

If the dd is using something like "if=/dev/dasda of=dev/dasdb" then I
would have thought that the cache would not be used. The cache is only
used for mounted filesystems, i.e. files/blocks referenced within the FS
via the mountpoint.

mark

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