Exabyte EXB-8205 Betriebsanleitung PDF herunterladen (Seite 76)

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101

Example

In an extreme case, suppose that the host is sending a series of

one-byte logical blocks to the CTS. Tape capacity is used as follows:

1. The CTS places the first two one-byte data blocks in the

1,024-byte physical block. No header information is added to

these blocks. This consumes two bytes of space in the physical

block.

2. The CTS then places the next 340 one-byte logical blocks into the

physical block, adding two bytes of header information to each

of the logical blocks. Therefore, these 340 one-byte data blocks

consume 1,020 bytes of space in the physical block.

3. The CTS adds two gap bytes to complete the 1,024-byte physical

block.

Because of the extremely small logical block size, tape capacity is

reduced by approximately two-thirds. (342 bytes of user data stored

in each physical block out of 1,024 bytes available.)

3-14

EXB-8205 and EXB-8505

(Standard and XL)

510503

3 Implementing CTS Operations

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