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dpm-drain - 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

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.

server specifies the host name of the disk server to be drained.

fs specifies the mount point of the dedicated filesystem.

gid specifies the comma separated list of gids to which the files must belong.

group specifies the comma separated list of groups to which the files must belong.

size 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.

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