On Wed, 17 Apr 2013, Rabindranath Vaz wrote:
> Hi,
> My setup uses ceph bobtail with 3 Metadata, 3 Montors, 6 Storage Nodes.
> The file types stored are image files of 5MB each, total amount of files
> expected is 5.5 million. As the application is not yet ported to using
> librados currently using cephfs. The ceph kernel module had issues mounting
> and would not start on reboot. The ceph-fuse has been working reliably. File
> saving and retrieving from the app works fine. Listing files is slow due to
> the number of files. Is there anything i can do to improve the file listing
> performance. When porting to librados can i utilize the files currently
> stored or would I need to backup and restore.
> Any inputs are much appreciated.
How many files are you storing in each directory? Keeping the directory
sizes smaller/smallish (1k to 10k files) should help.
You might also try 'mds frag = true' to enable directory fragmentation,
although be aware that this will be less stable.
sage
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