dpm-drain(1) drain a component of the Light Weight Disk Pool Manager


dpm-drain --poolname pool_name [ --server fs_server ] [ --gid gids ] [ --group groups ] [ --size amount_to_drain ]

dpm-drain --server fs_server [ --gid gids ] [ --group groups ] [ --size amount_to_drain ]

dpm-drain --server fs_server --fs fs_name [ --gid gids ] [ --group groups ] [ --size amount_to_drain ]

dpm-drain --help


dpm-drain drains a component of the Light Weight Disk Pool Manager: a filesystem, a disk server or a pool, optionally filtered by a list of gids/groups. It replicates files which belong to the given list of gids/groups (if specified) to another filesystem and removes the original file. It gives an error message for files still pinned. The pool name, the disk server name or the filesystem name can be specified.

Volatile files which have expired will not be copied and will be deleted during the draining process.

If no specfic file server and file system is specified, or no limit is placed on the files to drain, then the involved active file system(s) will have their status changed to RDONLY. If any of the involved file systems are marked as DISABLED they will not have their status changed, however an attempt will still be made to replicate the files from them and, if successful, delete the original.

Files which are to be moved and belong to a space will be moved to a different location (e.g. file system or disk server) but remain in the same space. If there is no alternate location within the same space an error will be reported for the file and it will not be drained.

Replicas of files with a lifetime will also have lifetime at least as long as the original. If this is not possible (for example available pools have a maximum lifetime too short) then an error is given and the file will not be drained.

This command requires ADMIN privilege.

specifies the disk pool name previously defined using dpm-addpool.
specifies the host name of the disk server to be drained.
specifies the mount point of the dedicated filesystem.
specifies the comma separated list of gids to which the files must belong.
specifies the comma separated list of groups to which the files must belong.
specifies the minimum number of bytes to drain. The number may be post-fixed with 'k', 'M', 'G' or 'T' for kilobyte, Megabyte, Gigabyte and Terabyte respectively. Draining is halted once the desired target has been reached or passed. If size is not specified or is given as zero dpm-drain will drain all eligible files.


        setenv DPM_HOST dpmhost
        setenv DPNS_HOST dpnshost

        dpm-drain --poolname Permanent

        dpm-drain --server lxb1921.cern.ch

        dpm-drain --server lxb1921.cern.ch --fs /storage

        dpm-drain --poolname Permanent --gid 105

        dpm-drain --server lxb1921.cern.ch --group dteam

        dpm-drain --server lxb1921.cern.ch --gid 105,104


This program returns 0 if the operation was successful or >0 if the operation failed.