Specifications

MDR User Guide 65
9.1.2 Disk Group in MDR Host Software
As described above, a disk group is an entity containing one or several FC disks. In or-
der to be easily manipulated, each disk group shall be named when created. Later, the
user can use this name to manage and access the data (read/write) on the disk group.
The disk group includes the following features:
• Management: via the MDR API, the user can create and destroy disk groups, add
and remove disks from a disk group.
• Scan: via the MDR API, the user can find the available disks. Because the disk group
information is stored on the disks itself, a scan operation can also find information
about the existing disk groups.
Note:
For more information on the MDR API functions, please refer to Chapter 8: MDR API
Functions and to the MDR API example programs.
For more information on the configuration items relative to the disk group, please refer
to the Chapter 10:Configuration Files.
9.1.3 Disk Group in MDR Server
Currently, the disk group implemented in the MDR Server is a partial version of the disk
group implemented in the MDR Host Software.
It does not include:
• Saving of the disk group information to the disks included in the disk group
• Part of the management: The user cannot create or destroy disk groups, add or re-
move disks from a disk group. The user has only the possibility of connecting to a
disk group (using the port id list of the disks to be included in the disk group) and
disconnecting from a disk group.
• Disk group scan operation (as no information is saved on the disks)
In order to avoid these limitations, the user has the possibility to connect the MDR Cli-
ent to the MDR Server AND use a direct FC link (via VMFC-2X00(P) board) to the FC
disks. In this case, all the disk group operations (management, scan, read/write, etc) are
realized via the direct FC connection, translated for the MDR Server if required and sent
to the MDR Server.
9.2 Transfer Operations
9.2.1 Transfer Types
Currently, the MDR includes two transfer types:
• Record A data source is sending data to the MDR via an input device (DPIO
input module). The MDR records the received data to the MDR disk
subsystem (JBOD/RAID) via a VMFC2x00 module. The collection of
recorded data is called a recording
• Playback Recorded data (inside a recording) is read from the MDR disk subsys-
tem by the MDR and sent to a receiver via an output device (DPIO
output module)
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