NDMP session information

Data management applications (DMAs) establish sessions with the NDMP daemon running on the Backup Accelerator node. The communication from the DMA with the NDMP daemon is managed under the context of a session.

The following items appear in the Sessions table:

Specifies the unique identification number that OneFS assigns to the session.
Specifies the time that has elapsed since the session started.
Specifies the amount of data that was transferred during the session.
Specifies the average throughput of the session over the past five minutes.
Specifies the IP address of the backup server that the data management application (DMA) is running on. If a NDMP three-way backup or restore operation is currently running, the IP address of the remote tape media server also appears.
Specifies the current state of the data mover and the data server. The first word describes the activity of the data mover. The second word describes the activity of the data server.

The data mover and data server send data to and receive data from each other during backup and restore operations. The data mover is a component of the backup server that receives data during backups and sends data during restore operations. The data server is a component of OneFS that sends data during backups and receives information during restore operations.

The following states might appear:

The data mover or data server is currently sending or receiving data.
The data mover is temporarily unable to receive data. While the data mover is paused, the data server cannot send data to the data mover. The data server cannot be paused.
The data mover or data server is not sending or receiving data.
The data mover or data server is waiting to connect to the data server or data mover.
Specifies the type of operation (backup or restore) that is currently in progress. If no operation is in progress, this field is blank.
B ({M} {F} [L[0-10] | T0 | Ti | S[0-10]] {r | R})


[ a ]—a is required

{ a }—a is optional

a | b—a or b but not at the same time

M—Multi-stream backup

F—File list



S—Snapshot mode

s—Snapshot mode and a full backup (when root dir is new)

r—Restartable backup

R—Restarted backup

0-10—Dump Level

R ({M|s}[F | D | S]{h})


M—Multi-stream restore

s—Single-threaded restore (when RESTORE_OPTIONS=1)

F—Full restore


S—Selective restore

h—Restore hardlinks by table

If an operation is currently in progress, specifies the /ifs directories that are affected by the operation. If a backup is in progress, displays the path of the source directory that is being backed up. If a restore operation is in progress, displays the path of the directory that is being restored along with the destination directory to which the tape media server is restoring data. If you are restoring data to the same location that you backed up your data from, the same path appears twice.
Specifies the name of the tape or media changer device that is communicating with the Isilon cluster.
Specifies how OneFS is interacting with data on the backup media server through the following options:
OneFS is reading and writing data during a backup operation.
OneFS is reading data during a restore operation.
The DMA has access to tape drives, but the drives do not contain writable tape media.
Allows you to probe or delete a session.

NDMP backup and restore operations

Examples of active NDMP backup sessions indicated through the Operation field that is described in the previous table are as shown:

 B(T0): Token based full backup
 B(Ti): Token based incremental backup
 B(L0): Level based full backup
 B(L5): Level 5 incremental backup
 B(S0): Snapshot based full backup
 B(S3): Snapshot based level 3 backup
 B(FT0): Token based full filelist backup
 B(FL4): Level 4 incremental filelist backup
 B(L0r): Restartable level based full backup
 B(S4r): Restartable snapshot based level 4 incremental backup
 B(L7R): Restarted level 7 backup
 B(FT1R): Restarted token based incremental filelist backup
 B(ML0): Multi-stream full backup

Examples of active NDMP restore sessions indicated through the Operation field that is described in the previous table are as shown:

R(F): Full restore
R(S): Selective restore
R(MF): Multi-stream full restore
R(sFh): single threaded full restore with restore hardlinks by table option