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Page B-4 Appendix B

Another benefit of write buffering is it tends to eliminate duplicate disk writes, such as

bitmap updates during operations such as copying files and tape restores and prevents

head thrashing when reading through random access data files and writing a sequential

file out to the disk (as most report generation programs do).

B.3.1Potential Pitfalls

Obviously, there can be problems with write buffering, especially if either the system

crashes or is powered off while writes are pending in the write buffer. If either of these

two cases occur, all pending writes will be lost. Though this sounds like a major

problem, it can also happen if write buffering is not enabled. However, write buffering

increases the number of writes at risk.

To help reduce the possibility of data loss, certain safeguards have been put in place.

Writes are not buffered indefinitely; they are performed whenever the device is not

performing reads. Even if the drive is busy with read requests, the buffer is still

periodically flushed, based on a user definable "absolute flush time." Additionally, the

MONTST command automatically flushes the write buffer.

The primary write buffering risks are an errant software operation or a hardware failure

that causes a system crash.

Therefore, you must weigh the potential for data loss (which is always there) versus the

dramatic performance increase seen when using write buffering. If you are worried

about the reliability of write buffering, it may be worth keeping in mind that the AM-520

disk controller has always used write buffering on a track-by-track basis (not quite as

efficiently as the AM-137 write buffering scheme however). The SMARTDRV program

that comes with MS-DOS 5.0 does write buffering (you may have noticed the "Waiting

for system shutdown" message when re-booting a PC with CTRL-ALT-DELETE) and

Unix based computers have always done it.

B.3.2Setting Up Write Buffering

In order to enable write buffering, you must be using the full SCSI dispatcher

(SCZRR.SYS). Write buffering is enabled by adding parameters to the SYSTEM

statement used to load the driver. All hard disk subsystem drivers for the AM-137 SCSI

interface must be loaded into system memory. Appending "/N" followed by the

buffer-size and flush-period will enable write buffering for that device. For example:

SYSTEM DVR:devn/N buffer-size flush-period

where devn is the device you want to enable write buffering for (for example DSK and

SUB). One SYSTEM command is required for each different SCSI disk driver present in

the system. For example, if you had two 1.2GB SCSI-2 drives named as DSK0-36 and

DSK37-73 and one 540MB SCSI-2 drive named SUB0-17, you would need one

additional SYSTEM command for the DSK device (although it’s really two physical

drives) and one additional SYSTEM command for the SUB device.

PDI-00137-50, Rev. A01

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Samsung UE48H4273SS Manual de usuario (74 paginas)

Marca: Samsung | Categoria: No info | Tamaño: 10.89 MB |

Tabla de contenidos

LED TV

English - 2

What's in the Box?

Attaching the TV to the Stand

Mount Kit (Optional)

Other Cautions

Securing the TV to the Wall

Connecting devices to your TV

TV viewing Card Slot)

Connecting to a Network

Network Connection - Wired

Remote Control

Turning on the TV

Initial setup

Selecting the video source

Viewing more TV features

Loading Reference Pages

Troubleshooting

Brightness

What is Remote Support?

Storage and Maintenance

TV Specifications

Licences

Deutsch - 2

Inhalt der Verpackung?

Wandhalterung (optional)

Weitere Vorsichtsmaßnahmen

Verbinden mit einem Netzwerk

Netzwerkverbindung – Kabel

Fernbedienung

Einschalten des Fernsehgeräts

Anfangseinstellung

Starten des e-Manual

Laden von Referenzseiten

Fehlerbehebung

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Was ist Fernunterstützung?

Lagerung und Wartung

Standby-Modus

Lizenzen

ATTENTION

Accessories

Téléviseur

Support mural

Autres avertissements

Fixation du téléviseur au mur

REMARQUE

Connexion à un réseau

Connexion réseau - Câble

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Capteur de la télécommande

Menu de fonction

Contrôleur du téléviseur

Configuration initiale

Lancement du e-Manual

Résolution des problèmes

Stockage et entretien

Spécifications du téléviseur

ATTENZIONE

Contenuto della confezione

Staffa

Altre precauzioni

Uso della “SCHEDA CI o CI+”

Connessione alla rete

Connessione di rete - Cablata

Telecomando

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Impostazione iniziale

Vista di altre funzioni TV

Risoluzione dei problemi

Conservazione e manutenzione

Specifiche TV

Raccomandazioni - Solo UE

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