Setup guide

10
ENGLISH
10
2. JBOD
JBOD units contain hard disks which adds to the internal storage, effectively
extending the number of images which can be recorded before being
overwritten.
Unlike RAID, JBOD units do not offer fault tolerance. Therefore, if a disk fails
then the information held on that disk is lost. The disks in the JBOD are not
hot-swapable.
Connecting multiple external devices
Up to five external storage devices can be daisy chained from the SCSI port
on the rear of the Digital Sprite 2.
Each device must have a unique address and the last device on the chain
must be terminated. Check with the device documentation for details of
addressing and termination and maximum cable length.
The table below gives capacity and typical uses of each storage device
including the internal CD writer.
The table below shows the record time on CD for typical record rates, using an
18K file size. These values can be used when using the internal CD writer for
additional storage.
CDR-640MB
DVD-R
1PPS
9h 46m
56h 22m
3PPS
3h 12m
18h 47m
12PPS
48m
4h 41m
2PPS
4h 49m
28h 11m
6PPS
1h 36m
9h 23m
25PPS
23m
2h 15m
External storage
Capacity
Description Typical use
RAID
Currently up to
10Tb
Disk array with
fault tolerance
Longer term storage
with instant access
640MB Removable media Clip storage
CD-R
JBOD
1Tb
Disk array with no
fault tolerance
Longer term storage
with instant access
Connecting storage devices
Images are recorded to the internal hard disk for instant playback and
searching by the operator. The capacity of the internal disk affects the amount
of images and time that can be recorded. For example, a 80GB Digital Sprite 2
can record for 8 days at default record rates, but a 320GB Digital Sprite 2 can
record for 31 days at the same record rates.
The internal hard disk is a temporary storage device as the images are
constantly being overwritten after a certain period of time.
If all images need to be kept for longer then external storage is required. The
50-way high density SCSI-2 port on the rear of the Digital Sprite 2 is used to
connect to external storage devices.
There are two types of external storage devices which can be used:
1. RAID – Redundant Array of Independent Disks
RAID units contain hard disks which adds to the internal storage, effectively
extending the number of images which can be recorded before being
overwritten.
RAID units give protection if a fault occurs. If a disk fails in a RAID the images
will continue to record to another disk in the array. RAID also allows faulty
disks to be hot-swapped – replaced whilst the RAID is powered.