Lengau has 16 OSSs arranged in pairs. There are 96 OSTs connected to the 8 pairs. Each OST has an approx. capacity of 43GiB giving a total Lustre storage of 4PiB. Each OSS pair connects to 12 OSTs. Should one OSS in a pair succumb, the other still retains access to all 12 OSTs.
The main tool for displaying information on the files and directories of a Lustre file system is
lfs find (instead of the standard GNU
find command) to search for Lustre files based on their metadata properties (size, striping, OSTs, etc.).
To find all files larger than 1GB:
lfs find <dirname> -size +1G
To find all files newer than 60 days:
lfs find <dirname> -ctime -60
Lustre is designed for parallel access to large files. It accomplishes this by using striping to distribute the contents of a large file across several disk arrays (OSTs) to enable fast parallel IO.
The standard recommendation from the Lustre developers is:
To set the striping for a file to 2
lfs setstripe -c 2 <filename>
To change the default striping applied to files in a sub-directory to 2 (and only applied to files larger than 1G)
lfs setstripe -c 2 -s 1G <dirname>
Check this ^^^.
lfs migrate for more.