The command will not return GOOD status to the initiator unless all buffered data blocks and File Marks if any were written correctly on the tape. It describes the Viper in more detail, breaking the system into its mechanical and electrical assemblies. It shall always be zero to indicate a Group six-byte command. Number of Recoverable Errors is a bit soft error count that accumulated over a series of commands. This provides an interlock so that the initiator can determine which message has been rejected. Please make sure that you are posting in the form of a question.
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Value 7 is always dedicated to the initiator and should never be specified as the Viper controller I. If practical, save the container and packing materials for any future reshipment.
This integration provides for low power consumption and high data reliability. One method of doing this is to read and preserve the entire directory in memory during the tape update process and then write it back to tape when the process concludes.
Full text of “archive :: Viper SCSI S S Product Manual Jun88”
Number of Recoverable Errors is a bit soft error count that accumulated over a series of commands. An increase in rewrites or the recoverable error rate can indicate that the recording medium is deteriorating. The Verify Length specifies the number of contiguous blocks to be verified.
An Allocation Length of zero indicates that no bytesof response willbe transferred. Since the block size for a Viper drive is alwayswhen the other device has a block size of the number of blocks to be copied must be an even number.
The following paragraphs describe the Viper’s signal interface to the host. Get to Know Us. The initiator shall then set the current pointers to the initial state of the next linked command. Byte 1, bits the UnitOfl and DevOfl bits must be set to zero.
The drive controller initiates up to 16 attempts to rewrite or re- read the marginal data block. Redundant use of the command is not archkve an error.
Archive Viper 2150S Manuals
Illustrations of the 9-track, track and track serpentine patterns follow. It is the ideal solution to the backup requirements of high capacity Winchester disk drives.
A negative value -N 2’s complement notation in the Count archiev causes reverse tape movement over N blocks or File Marks or sets of File Marks. In non-buffered mode, Residual Length equals the difference between the re- quested transfer length and the actual number of blocks written to tape. When there are no exception conditions during the space-by-count functions, forward movement of the tape ends on the EOM side of the last block or File Mark and reverse movement ends on the BOM side of the last block acrhive File Mark.
With a clean, dry swab, wipe the head using the same motions described in step d, until the head is clean and dry.
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These holes are detected by the drive sensor assembly refer to Figure 8 which generates hole-detect signals used to control tape motion. Don’t see what you’re looking for?
The recorded tape appears logically to consist of one long, winding track. Viper is a trademark of Archive Cor- poration. Chapter 2 Installation Power Connector The power connector is located at the upper left on the rear of the Viper assembly Fig- ure 3.
Each command will have a data length equivalent to the remote device’s block size. Please make sure that you are posting in the form of a question. Write precompensation enhances data reliability and interchange. Flag bit – The Flag bit is used only in conjunction with the Link bitand must be set to zero if the Link bit is zero. In addition to the exceptions associated with reading or writing data to the Viper drive see Read and Write commands, as appropriatethe following exceptions may be reported for the COPY command: The Safe position designates that writing to the tape is inhibited see Figure Note that in this case it is possible for Residual Length to exceed the Transfer Length.
Viper reservation, once established, will remain in effect until one of the following: The tape mustbe positioned at beginning-of-medium BOM when the command is issued or the command will be rejected.
The command will not return GOOD status to the initiator unless all buffered data blocks and File Marks if any were written correctly on the tape. Viper Rear View Archove Conventions The following conventions are used to describe interface signal notation.