On Mon, 21 Sep 2009 08:36:23 -0400 Niklas Edmundsson <[email protected]> wrote:
> Some additional (probably stupid) thoughts: > > - What happens if you truncate the file by opening it with O_TRUNC, or > are we doing that already, or will it make the cache go bezerk? Well, I don't think the behavior is any different. One we see that behavior for a file, it is set forever. The only way around it seems to be to create a new file. > - I was going to suggest doing fstat() on the fd, but it > probably won't help as it would return blocks _on disk_, and stuff > still hanging in memory pending a disk flush won't be counted. Normally a filesystem would report the correct number of blocks in fstat() even if the data is buffered. You are correct, though; for ZFS the block usage doesn't get updated immediately. I don't know enough about the internals to say why. > - Or just use memcache... Or a disk cache with UFS, tmpfs, or any non-ZFS fs... I asked about this on zfs-discuss, by the way: <http://opensolaris.org/jive/thread.jspa?threadID=113089> Nothing really useful quite yet, though. -- Andrew Deason [email protected] _______________________________________________ OpenAFS-devel mailing list [email protected] https://lists.openafs.org/mailman/listinfo/openafs-devel
