Specifications

The number of the recording to copy is specified by the parameter RecordingNb. If this
parameter is not specified then the current recording is copied.
While copying data from the MDR Disks Subsystem to the MDR Tape Subsystem, it is
possible to specify which part of the recording is copied using the
FirstRecordingBlockToCopy and LastRecordingBlockToCopy parameters. These
parameters represent the first and last blocks of the recording to be copied.
For instance, to copy all the data contained in a recording, set the parameter
FirstRecordingBlockToCopy to 0 and the parameter LastRecordingBlockToCopy to
the number of user blocks (field UserBlocks of the RECORDING structure) minus 1.
Using the CopyRecording function while making a recording affects the recording performance.
The MDR Server may stop recording due to this.
Currently, only the following copy commands are allowed:
Source Target
Disks Tape
copy data from the MDR disk subsystem to SCSI tapes
(1 or several tapes according to the recording length
and the internal drive compression rate),
Tape Disks copy data from SCSI tapes (1 or several tapes
according to the recording length) to the MDR disk
subsystem,
Returned value:
OK or ERROR.
If
ERROR is returned then the errno variable will be set accordingly. See MdrDefs.h for
MDR
errno values.
CreateDiskGroup
Declaration:
STATUS CreateDiskgroup (char DiskGroupName,
DISK_INFO * DiskInfoTbl,
UINT DiskInfoTblSize,
UINT DiskStripeSize,
BOOL ClearRecordingTable);
Description: Create a new disk group.
This function creates a new disk group named
<DiskGroupName>. The new disk group
will contain the disks whose information is located in the
<DiskInfoTbl> parameter.
The disks are specified using their information (port and controller identifiers). Disk
information can be retrieved using the Scan function.
The
<DiskStripeSize> parameter defines the size of each stripe on each disk.
Therefore, the size of a stripe on the disk group is the
<DiskInfoTblSize> parameter
(number of disks in the disk group) times the
<DiskStripeSize> parameter.
Currently, 512KiB (512*1024 bytes) is the only value supported by the MDR
Software for the <DiskStripeSize> parameter.
When adding a list of disks to an existing disk group, the recording table contained on
the disk group is cleared or kept intact according to the value or the parameter
ClearRecordingTable. If the recording table is cleared then any recording data present
on the initial disk group or on the disks to add will be LOST.
Returned value:
OK or ERROR.
If
ERROR is returned then the errno variable will be set accordingly. See MdrDefs.h for
MDR errno values.
MDR User Guide 49
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