Connecting Storage Devices - Dedicated Micros digital sprite Einrichtungsanleitung

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 Digital Sprite with a single 30GB
hard disk can record for three days at the 24 hour time-lapse mode using two
75GB hard disks allows 2 weeks of recording.
The internal hard disk is a temporary storage device as the images are constantly
being overwritten after a certain period of time. If 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 is used to connect to external storage devices. There
are three 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 amount 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.
® ®
2. Iomega Zip and Jaz disks
Images can be copied from the internal hard disk or RAID onto removable Zip
disks for longer term storage. Removable disks are ideal for recording relatively small
amounts of images such as events, video clips, or incidents. These images can be
played back on any PC with a Zip ® or Jaz
® or Jaz
® drive and DM Playback software installed.
Zip ® and Jaz ® disks are available in different disk capacities, the table below shows
the recording times at typical recording rates (at S-VHS image quality, 18KB):
1PPS
®
Iomega Zip 100MB 1h 30m
®
Iomega Zip 250MB 3h 46m
®
Iomega Jaz 1GB 15h 4m
®
Iomega Jaz 2GB 30h 8m
Times indicate all cameras being copied to the disk.
3. DDS and VXA tapes
Images recorded to the internal disk can be automatically archived to Hewlett
Packard DDS and Ecrix VXA tapes. This allows a tape a day solution, similar to
that of a multiplexer and VCR. The disk size does not have to be large when
using tapes to archive images, although the disk size determines what is instantly
accessible from the Digital Sprite.
The table below shows the number of hours a tape will last for when used at
different record rates (at S-VHS images quality, 18KB)
6hr
HP DDS-3 12GB 25PPS
®
HP DDS-4 20GB 25PPS
Ecrix VXA 20GB 25PPS
See Appendix 1 for details of configuring Digital Sprite for tape archiving.
2PPS 3PPS 6PPS 12PPS
45m 30m 15m 7m
1hr 53m 1h 15m 37m 18m
7h 32m 5h 1m 2h 30m 1h 15m
15h 4m 10h 2m 5h 1m 2h 30m
12hr 24hr 48hr 72hr
14PPS 7PPS 3PPS 2PPS
23PPS 11PPS 5PPS 3PPS
23PPS 11PPS 5PPS 3PPS
25PPS
3m
9m
36m
1h 12m
168hr
1PPS
1PPS
1PPS
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