Dedicated Micros digital sprite 2 Setup Manual page 12

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.
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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.
External storage Capacity
RAID Currently up to
10Tb
JBOD 1 Tb
CD-R 640MB
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.
1PPS 2PPS
9h 46m 4h 49m
CDR-640MB
DVD-R 56h 22m 28h 11m
Description Typical use
Disk array with Longer term storage
fault tolerance with instant access
Disk array with no Longer term storage
fault tolerance with instant access
Removable media Clip storage
3PPS 6PPS 12PPS 25PPS
3h 12m 1h 36m 48m 23m
9h 23m
18h 47m 4h 41m 2h 15m