User manual FREECOM LTO 460ES

[. . . ] 8OWULXP *HQHUDWLRQ ([WHUQDO 7DSH 'ULYHV *HWWLQJ 6WDUWHG *XLGH Contents Read the "Pre-Installation" and "Installing the tape drive" sections if you have to install or replace your Ultrium tape drive. If you have purchased your tape drive pre-installed in a server, go directly to the operating and troubleshooting information commencing on page 23. Pre-Installation Before you start Backup software and drivers Usage models page 3 page 5 page 7 Installing the tape drive Step 1: Check the SCSI connection Step 2: Check the drive's SCSI ID Step 3: Connect the SCSI cable Step 4: Connect the power cable Step 5: Verify installation page 9 page 11 page 13 page 15 page 17 Using the tape drive Your Ultrium tape drive Use the correct media Optimizing performance Troubleshooting Understanding the LEDs Problems with cartridges page 19 page 21 page 23 page 25 page 29 page 32 1 Copyright © 2000-2003 by Hewlett-Packard Limited. February 2003 The information contained in this document is subject to change without notice. This document contains proprietary information which is protected by copyright. [. . . ] · Stick labels onto the label area only. · Do not bulk erase Ultrium format cartridges. · See the insert included with the tape cartridge for storage conditions. 22 Optimizing performance Various factors can affect tape drive performance, particularly in a network environment or if the drive is not on a dedicated SCSI bus. If your tape drive is not performing as well as expected, consider the following points. Is the tape drive on a dedicated SCSI bus? For optimum performance, we recommend that the tape drive is the only device on the SCSI bus. If it is not, ensure other devices are LVD-compliant. If they are single-ended, the bus will switch to single-ended mode with a lower transfer speed. There will also be restrictions on cable length. Auto termination powers down when the tape drive powers down. This can cause a problem, if there are other devices on the SCSI bus. Can your system deliver the required performance? The Ultrium 460 tape drive can write data at 30 MB/s (native) or 60 MB/s (compressed assuming 2:1 compression), however, to get this performance it is essential that your whole system can deliver this performance. Typical areas where bottlenecks can occur are: · Disk system (a single hard disk drive will not be able to deliver 60 MB/s transfer rates). · Some file systems are able to transfer data faster than others. · The type of data being backed up can affect backup performance (for example, file sizes and compressibility). · Some backup software performs better than others. To improve performance you may like to consider a RAIDed disk solution with a large number of physical hard disks. Some enterprise class backup applications can be made to interleave data from multiple sources, such as clients or disks, to keep the tape drive working at optimum performance. Is the data transfer rate too slow? Adaptive Tape Speed (ATS) enables the drive to "stream" data at variable tape speed, which means that it maintains a continuous data flow to tape even when the transfer speed varies. This is automatically managed by the drive to keep the drive running at best performance. When using Ultrium 2 cartridges, the ATS range is 10 -30 MB/s, so, if possible data transfer should remain within this range. In most cases, the backup application will provide details of the average time taken at the end of the backup. Note For optimum performance always use Ultrium 2 400 GB cartridges. If you are using Ultrium 1 200 GB cartridges, the ATS range is 6. 6-20 MB/s. 23 Performance checklist The following list summarizes factors that can affect performance. They provide a guideline only of areas that may need further investigation. They do not attempt to explain how to configure individual systems. · Is the tape drive reading and writing data at the correct speed? [. . . ] If a terminator is connected, remove it. If another SCSI cable is connected, make sure that the SCSI chain is terminated at the last device. Call for service. There has been an enclosure failure or the cooling fan is not working correctly. 31 Problems with cartridges If you experience any problems using Ultrium branded cartridges, check: · The cartridge case is intact and that it contains no splits, cracks or damage. · The cartridge has been stored at the correct temperature and humidity. [. . . ]