User manual QUANTUM LTO3 DRIVE

[. . . ] Quantum LTO-3 Tape Drive User's Guide, P/N 50002764, B01, July 2005 Made in USA. Quantum Corporation provides this publication "as is" without warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability or fitness for a particular purpose. Quantum Corporation may revise this publication from time to time without notice. Making copies or adaptations without prior written authorization of Quantum Corporation is prohibited by law and constitutes a punishable violation of the law. [. . . ] More information can be transferred in the same time interval. Data Compression Considerations 4 In an effective data-compression method, several factors are important: · The amount of compression. This ratio compares the amount of uncompressed data to the amount of compressed data. It is obtained by dividing the size of the uncompressed data by the size of the compressed data. The speed with which data is compressed and decompressed relative to the host transfer rate. The data integrity of the compressed data. · · · The amount of compression possible in a data stream depends on factors such as: · · · · · · Data pattern Compression algorithm Pattern repetition length Pattern repetition frequency Object size (block of information to be compressed) Starting pattern chosen 36 LTO-3 Tape Drive User's Guide Chapter 4 Theory Data Compression The transfer rate depends on factors such as: · · · · · Compression ratio Drive buffer size Host computer input/output (I/O) speed Effective disc speeds of the host computer Record lengths that the host computer transmits Data compression algorithms can be tailored to provide maximum compression for specific types of data. Because varying types of data are encountered in normal day-to-day operating circumstances, however, an effective data compression method for a tape drive must serve various data types. Additionally, the data compression method must adapt to different data types, automatically providing optimum handling for all types of data. Intelligent Data Compression 4 The tape's compressed capacity is maximized through the use of intelligent data compression. The intelligent data compression hardware determines the compressibility of each record. If the size of the record is larger after a compression attempt than the native (uncompressed) size, then the record is written in its native form. The intelligent data compression utilizes two compression schemes: · · Scheme-1 is a LZ1-based compression scheme using a history buffer to achieve data compression. Scheme-2 is a pass-through compression scheme designed to pass uncompressible data through with minimal expansion. There are three specific requirements for compliance with the LTO specification. · · · The output data stream must be decompressible following LTO rules to create the input sequence of records and File Marks perfectly. An LTO compressed data stream may not contain any of the eight reserved Control Symbols. While control symbols allow switching to Scheme 2, this should never be used by operational software because this capability is only for diagnostic and testing purposes. LTO-3 Tape Drive User's Guide 37 Chapter 4 Theory Data Compression Software data compression should never be used because the LTO-3 Tape Drive's built-in intelligent data compression is much more efficient than software data compression systems. The LTO-3 Tape Drive uses a derivative of ALDC-2 lossless data compression that includes additional control codes for intelligent data compression. 38 LTO-3 Tape Drive User's Guide Chapter 5 5Specifications This chapter provides technical specifications for the LTO-3 Tape Drive. The topics covered in this chapter are: · · · · · · · · · Physical Specifications Power Specifications Drive Performance Specifications Environmental Requirements Reliability Mean Time Between Failures LTO Cartridge Specifications Regulatory Compliance Disposal of Electrical and Electronic Equipment LTO-3 Tape Drive User's Guide 39 Chapter 5 Specifications Physical Specifications Physical Specifications Table 5 lists the physical specifications of the LTO-3 Tape Drive. 5 Table 5 Physical Specifications Specification Height Width Length Weight 1 2 Internal SCSI Drive without Bezel 3. 25 inches (82. 6 mm) max 5. 75 inches (146. 05 ± 0. 25) 8. 06 inches (205 mm) 6. 2 lb. (2. 82 kg) Internal SCSI Drive with Bezel 3. 31 inches (84. 3 mm) 5. 81 inches (147. 8 mm) 8. 3 inches (212 mm) max 6. 5 lb. (2. 95 kg) Desktop SCSI Drive 6. 8 inches1 (172. 7 mm) 7. 61 inches (193. 3 mm) 12. 17 inches2 (309. 1 mm) 14. 5 lb. Includes front bezel and fan grill (case alone is 11. 9 inches long). 40 LTO-3 Tape Drive User's Guide Chapter 5 Specifications Physical Specifications Figure 14 shows the dimensions of the internal LTO-3 Tape Drive. Figure 14 Internal LTO-3 Tape Drive Dimensions 212. 0 Max. (Less connectors) 55. 9 79. 24 ± 0. 20 84. 3 21. 80 ± 0. 20 82. 6 Max 48. 90 ± 0. 60 From Upper Bezel Mounting Tabs 4 x M3. 0 Nearside 4 x M3. 0 Farside 205. 0 Max. Length of Drive without Bezel (Less connectors) 9. 90 ± 0. 20 4 x M3. 0 x 5. 0 Deep 189. 70 ± 0. 20 146. 05 ± 0. 25 147. 8 48. 90 ± 0. 60 From Upper Bezel Mounting Tabs 79. 24 ± 0. 20 LTO-3 Tape Drive User's Guide 41 Chapter 5 Specifications Power Specifications Power Specifications The desktop LTO-3 Tape Drive comes with a built-in 90-260VAC (47-63 Hz) automatic switching power supply. Maximum voltage and power specifications for the internal LTO-3 Tape Drive is listed in the tables below. [. . . ] If the tape did not eject and the LEDs show POST Failure, Hardware, or Firmware Error, or Manual Intervention Required, the drive may be bad. 1 If you have a problem with inserting a cleaning cassette and receive the message: The last cleaning cartridge used in the tape drive has worn out: Contact Customer Support. 1 Discard the worn out cleaning cartridge. The drive will continue to automatically eject the expired cleaning cartridge. 2 If you insert a cleaning tape that is not expired but the tape is being ejected by the tape drive without performing the cleaning, you may see the message: The last cleaning cartridge used in the tape drive was an invalid type: 1 Do not use this cleaning cartridge in this drive. [. . . ]