Fujitsu PRIMERGY LTO2 Manuale d'uso - Pagina 15

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4 Cautions concerning backup

In this chapter:
• "Ejecting the data cartridge after
• "Data compression
• "Backup
performance/capacity" on page 15
• "Points to note during system

Ejecting the data cartridge after backup

•
Do not leave the data cartridge in this product.
Doing so makes the data cartridge wear faster, because the longer it is used, the faster it wears.
The tape recording surface of the data cartridge is exposed when inserted in this product and if
it is left in this state for a long time it will easily be affected by suspended particles of dust. Insert
the data cartridge just before the backup operation, and remove it immediately after the operation.
•
Do not turn off the power with the data cartridge inserted.
If the power is turned off with the data cartridge inserted, it takes a while before this product can
be used after the next power-on.

Data compression rate

This product has a data compression function included in the hardware.
Although the data compression rate is approximately 200%, it varies depending on the data content.
Data that has already been compressed by software is not effected by this product.
Some backup software has a data compression function prior to transfer, however, do not compress
data by software if the hardware compression function is on.

Backup performance/capacity

The backup performance and backup capacity that can be used in one data cartridge varies depending
upon the following factors:
•
The conditions (attrition, dust, etc.) of the recording surface of the data cartridge to be used
•
The dust and dirt condition of the product's magnetic head
•
The data compression rate
•
The workload on the server

Points to note during system configuration

When repeatedly using a single data cartridge, all the data can be lost if the backup fails. Also, if a
backup data cartridge becomes damaged, the data cannot be recovered.
backup" on page 15
rate" on page 15
configuration" on page 15
LTO-2 Half-Height SAS Tape Drives
15