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Read, Read Reverse, or Space Blocks command. This is most noticeable when the
host sends a command to read one block while the tape is at BOT, or to read one
block in the opposite direction (i.e., read reverse after a read forward operation). If
read-ahead is enabled, the drive will continue to move the tape and read blocks into
the buffer until the buffer is full. If read-ahead is disabled, the drive will move only
the amount of tape required to read one block into the buffer.
The read-ahead operation is transparent to the host, and is not available during
write operations.
•
- The read-ahead operation is disabled;
OFF
•
- The read-ahead operation is enabled for any Read or Space command,
1 FMK
and ends either when the buffer is full or when one filemark is encountered. The
read-ahead operation will resume when a Read, Read Reverse, or Space
command is processed after the filemark is transferred to the host;
•
- The read-ahead operation is enabled for any Read or Space command.,
2 FMK
and ends either when the buffer is full or when two sequential filemarks are
read. The read-ahead operation will resume when a Read, Read Reverse, or
Space command is processed after the two sequential filemarks are transferred
to the host. Note that two sequential filemarks usually indicate logical EOT.
5.1.25
Read CER (Default = Ignore)
This parameter allows you to inhibit the reporting of correctable errors (CERs)
during read operations.
•
IGNORE
read error occurs;
•
REPORT
read error occurs.
In both cases, corrected data is sent to the host. An Incorrect Length Indicator (ILI)
may accompany the Recoverable Error Check Condition.
5.1.26
Read HER (Default = Report)
The Read HER parameter allows you to inhibit the reporting of hard errors and to
disable retries during read operations.
•
REPORT
•
IGNORE
5.1.27
Read Retrys
This parameter lets you set the number of automatic retries the drive will perform
when it detects a hard error during a read operation. If the error occurs, the drive
5-12
- The drive will not report a Recoverable Error Check Condition when a
- The drive will report a Recoverable Error Check Condition when a
- Report hard errors as media errors.
- Do not report hard errors and do not perform retries.
SCSI Configuration
500300 Rev. U
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