Справочник Пользователя для Iomega tapeware

 

For this reason, it is important to keep data constantly flowing to the tape drive. The 
performance of your job will be maximized when the tape drive constantly has data 
available to it. 

There are several steps you can take to make sure that data is constantly available to the 
backup device. 

Prefer Local Buses to Network Connections  In general, data is transmitted more 
efficiently over a local bus than over a network connection. Thus, for example, 
performance increases if the backup device is connected to the file server rather than to a 
different machine on the network, although either arrangement is possible. 

Note that the storage management database need not be placed on the same machine as 
the backup device. The location of the storage management database does not affect the 
rate of data transmission. (Other job tasks, such as building backup selection lists and 
opening and closing files, create network traffic and require CPU calculations. While the 
location of the storage management database will affect these parts of the job, the 
advantages of a remote location of the database often outweigh any speed loss.) 

Add a Second Device Controller  A backup device and volume may be on the same 
machine with a local connection between them. If the backup device and the volume 
share the same device controller, this limits the speed of data transmission and may cause 
a TapeWare error. Therefore, you should add a second device controller specifically for 
the backup device. This can effectively double the rate of data transmission and enhance 
TapeWare operation. At the least, you should connect the backup device to a different 
SCSI chain or IDE channel. 

Use a Wider Data Stream  For both network and local connections, the width of the data 
stream affects the rate at which data can be transferred. Many tape drives are capable of 
writing data much faster than can be transferred over older device controllers and 
network connections. By upgrading to more recent technology with wider data streams, 
there will be fewer interruptions in the stream of data to the backup device. For example, 
consider using a Wide or Ultra Wide SCSI controller for the backup device. Additionally, 
for network connections, consider upgrading from 10Base-T Ethernet to 100Base-TX. 

Consult your manufacturer’s documentation to see if your backup device would benefit 
from a wider data stream. 

Use the Proper Number of Data Streams  TapeWare is capable of controlling up to eight 
data streams per backup device simultaneously. This feature can greatly increase your job 
speed since multiple devices can simultaneously send data. For example, four backup 
devices can support up to 32 simultaneous data streams.