Dedicated Micros Digital Sprite Lite Guia de preparacion descargar pdf (Pagina 12)

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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.

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.

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