Thanks Greg and Steffen for your answer. I will make some tests. Gregory Farnum wrote: > Yeah. The metadata pool will contain: > 1) MDS logs, which I think by default will take up to 200MB per > logical MDS. (You should have only one logical MDS.) > 2) directory metadata objects, which contain the dentries and inodes > of the system; ~4KB is probably generous for each? So one file in the cephfs generates one inode of ~4KB in the "metadata" pool, correct? So that (number-of-files-in-cephfs) x 4KB gives me an (approximative) estimation of the amount of data in the "metadata" pool? > 3) Some smaller data structures about the allocated inode range and > current client sessions. > > The data pool contains all of the file data. Presumably this is much > larger, but it will depend on your average file size and we've not > done any real study of it. -- François Lafont _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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