On Wed, Jun 22, 2016 at 06:58:16PM +0300, Danny Shavit wrote: > Hi, > > We are looking for a method to estimate the size of metadata overhead for a > given file system. > We would like to use this value as indicator for the amount of cache memory > a system for faster operation. > Are there any counters that are maintained in the on-disk data > structures like free space for examples? No. Right now, you'll need to take a metadump of the filesystem to measure it. The size of the dump file will be a close indication of the amount of metadata in the filesystem as it only contains the filesystem metadata. In future, querying the rmap will enable us to calculate it on the fly, (i.e. not requiring the filesystem to be snapshotted/taken off line to do a metadump). Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
