Each Image Archive is logically divided into one or more Image Volumes, which that can replicate
across various Sites. This replication can be either automatic Automatic or manualManual.
Volume Block - One or more Image Volume Blocks are created for
each Image Volume, which provide the actual physical storage for the documents
stored in an Image Volume. Image Server for an Image Volume Block allocates no
actual physical space at the time of creation; the space is allocated as and
when required. The size of Image Volume Block is specified at the time of volumeVolume creation. This
size refers to the maximum size of the document data file that will be created
corresponding to each VolBlock in the volumeVolume. Documents are
added serially in the document data file until the maximum size is reached. A
new VolBlock is created for the next document to be added after the maximum
size is reached. This VolBlock size is flexible and can be modified after volumeVolume creation also.
If a document, larger in size than
the max VolBlock size,
is added it is dumped completely in the current vol blockBlock and a new one is
created for next document. There is no limit on the physical storage occupied
by an Image VolumeVolume.
The concatenated string of Site Id , Volume ID and VolBlock
ID in Base 36 notation and prefixed by PN forms the name of a document data
file in which data of the volblock is
stored. These files contain actual document together with iImage cCabinet recovery
information as headers.
Name of data
file created corresponding to a volblock : PN00V0VB.SITE
Structure
of a VolBlock
|
Image Cabinet Recovery Information |
Recovery Information of Document 1 |
Document 1 |
Recovery Information of Document 2 |
Document 2 |
… |
… |
… |
Following functions are exposed for volume operations.