Messages in this thread | | | Date | Wed, 25 Apr 2007 05:50:55 +0530 | From | "Karuna sagar K" <> | Subject | ChunkFS - measuring cross-chunk references |
| |
On 4/24/07, Theodore Tso <tytso@mit.edu> wrote: > On Mon, Apr 23, 2007 at 02:53:33PM -0600, Andreas Dilger wrote: ......... > It would also be good to distinguish between directories referencing > files in another chunk, and directories referencing subdirectories in > another chunk (which would be simpler to handle, given the topological > restrictions on directories, as compared to files and hard links). >
Modified the tool to distinguish between 1. cross references between directories and files 2. cross references between directories and sub directories 3. cross references within a file (due to huge file size)
Below is the result from / partition of ext3 file system:
Number of files = 221794 Number of directories = 24457 Total size = 8193116 KB Total data stored = 7187392 KB Size of block groups = 131072 KB Number of inodes per block group = 16288 No. of cross references between directories and sub-directories = 7791 No. of cross references between directories and file = 657 Total no. of cross references = 62018 (dir ref = 8448, file ref = 53570)
Thanks for the suggestions.
> There may also be special things we will need to do to handle > scenarios such as BackupPC, where if it looks like a directory > contains a huge number of hard links to a particular chunk, we'll need > to make sure that directory is either created in the right chunk > (possibly with hints from the application) or migrated to the right > chunk (but this might cause the inode number of the directory to > change --- maybe we allow this as long as the directory has never been > stat'ed, so that the inode number has never been observed). > > The other thing which we should consider is that chunkfs really > requires a 64-bit inode number space, which means either we only allow > it on 64-bit systems, or we need to consider a migration so that even > on 32-bit platforms, stat() functions like stat64(), insofar that it > uses a stat structure which returns a 64-bit ino_t. > > - Ted >
Thanks, Karuna [unhandled content-type:application/x-bzip2] | |