This depends very much on how many active files you have at once and how beefy your MDS machines are. By default the MDS will cache 100k dentries, and each dentry takes ~1KB of RAM. If you have sufficient RAM you can increase the size of the cache arbitrarily, though!
There's actually no required relationship between total filesystem size and MDS memory, though, since all the metadata is stored in on-disk objects. We haven't done serious memory profiling in a while, though, so there may be other constraints acting up that we're missing out on here. -Greg On Jun 10, 2011, at 11:47 AM, Fyodor Ustinov wrote: > Hi! > > Which configuration would you recommended for cluster with 50-80 million > files? > > WBR, > Fyodor. > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
