[Linux-cluster] Slow dfs

[David Teigland]

On Tue, May 09, 2006 at 02:23:43PM +0100, Stephen Willey wrote:
> I saw a question a while back from Jeffrey Bethke about speeding up df
> operations.
> 
> We're considering building a large GFS filesystem and the 11Tb
> filesystem that we have now can take a very long time to return from a
> df (either regular or using gfs_tool).
> 
> Once it's run once it appears to cache the information and runs quite
> quickly, but we're concerned about how this will scale once we get up to
> 100 or so Tb.  Waiting ages for a df to return isn't ideal...

It'll get slower as the fs grows.  In GFS2 df will have no delay at all
regardless of fs size -- tradeoff is that it's "fuzzy", not perfectly
accurate.

Dave