IBM TS2340 User Guide - Page 351

Rewind, Forward Space Filemarks, Space to End of Data, Read and Write Tests

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IBM Tape Diagnostic Tool Rewind When you select the Rewind command, ITDT issues the ioctl rewind command for the device. Forward Space Filemarks When you select the Forward Space Filemarks command: 1. Enter the amount of Filemarks to Forward Space, in the Filemark-Count box. 2. ITDT issues (extrinsic) ioctl command. 3. The tape is positioned on the first block of the next file. Backward Space Filemarks When you select the Backward Space Filemarks command: 1. Enter the amount of Filemarks to Backward Space, in the Filemark-Count box. 2. ITDT issues (extrinsic) ioctl command. 3. The tape is positioned on the last block of the previous file. Forward Space Records When you select the Forward Space Records command: 1. Enter the amount of Records to Forward Space, in the Record-Count box. 2. ITDT issues (extrinsic) ioctl command. Backward Space Records When you select the Backward Space Records command: 1. Enter the amount of Records to Backward Space, in the Record-Count box. 2. ITDT issues (extrinsic) ioctl command. Space to End of Data When you select the Space to End of Data (EOD) command, ITDT issues the (extrinsic) ioctl command. Read and Write Tests When you select the Read and Write Tests command, ITDT performs the following functions (Read and Write Test, Read Only Test, and Write Only Test). There are three parameter fields to fill out that have default values already in them. Next there will be a Test pull down menu which will give you the option of ″Read Data from Tape, Write Data to Tape, and Read/Write/Verify″. Once this is done, the following steps below are followed depending on which test is selected. v The following steps are the Read/Write steps: 1. Issues a Read Position. 2. Sets block size. 3. Generates special pattern. 4. Puts block id in bytes 0-3 of each block. 5. Prints current block number, number of bytes and blocks. 6. Issues write command. 7. Prints updated statistics. 8. If number of bytes written is different from requested bytes to write, stop (go to Step 19 on page 334). Chapter 10. IBM Tape Diagnostic Tool (ITDT) 333

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Rewind
When you select the Rewind command, ITDT issues the
ioctl
rewind command for
the device.
Forward Space Filemarks
When you select the Forward Space Filemarks command:
1.
Enter the amount of Filemarks to Forward Space, in the Filemark-Count box.
2.
ITDT issues (extrinsic)
ioctl
command.
3.
The tape is positioned on the first block of the next file.
Backward Space Filemarks
When you select the Backward Space Filemarks command:
1.
Enter the amount of Filemarks to Backward Space, in the Filemark-Count box.
2.
ITDT issues (extrinsic)
ioctl
command.
3.
The tape is positioned on the last block of the previous file.
Forward Space Records
When you select the Forward Space Records command:
1.
Enter the amount of Records to Forward Space, in the Record-Count box.
2.
ITDT issues (extrinsic)
ioctl
command.
Backward Space Records
When you select the Backward Space Records command:
1.
Enter the amount of Records to Backward Space, in the Record-Count box.
2.
ITDT issues (extrinsic)
ioctl
command.
Space to End of Data
When you select the Space to End of Data (EOD) command, ITDT issues the
(extrinsic)
ioctl
command.
Read and Write Tests
When you select the Read and Write Tests command, ITDT performs the following
functions (Read and Write Test, Read Only Test, and Write Only Test). There are
three parameter fields to fill out that have default values already in them. Next
there will be a Test pull down menu which will give you the option of
″
Read Data
from Tape, Write Data to Tape, and Read/Write/Verify
″
. Once this is done, the
following steps below are followed depending on which test is selected.
v
The following steps are the Read/Write steps:
1.
Issues a Read Position.
2.
Sets block size.
3.
Generates special pattern.
4.
Puts block id in bytes 0-3 of each block.
5.
Prints current block number, number of bytes and blocks.
6.
Issues write command.
7.
Prints updated statistics.
8.
If number of bytes written is different from requested bytes to write, stop
(go to Step 19 on page 334).
IBM Tape Diagnostic Tool
Chapter 10. IBM Tape Diagnostic Tool (ITDT)
333