HP LTFS Linear Tape File System user guide

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5 HP TapeAssure drive monitoring A drive monitoring service for HP LTFS on Linux is available as a separate download offering access to: • Drive Health — write/read quality levels, key drive life indicators, and any service actions • Drive Performance — host and media transfer rates and compression ratios • Drive Utilization – the time the drive is in use as a percentage • Tape Health – effective capacity, key tape life indicators and any service actions • Tape Utilization – write and read data volumes and capacity used The download has two parts: • The TapeAssure service that runs on the LTFS server • CommandView TL which is used to store and view the TapeAssure data Note that CommandView TL is a web-based management application for HP’s enterprise tape libraries that runs on Windows systems and needs to have network connectivity with the TapeAssure service. It is used with the HP LTFS TapeAssure service in this configuration for access to the TapeAssure data only and references to library functionality should be ignored. See http://www.hp.com/go/tapeassure for further details, downloads and user guides. 14 HP TapeAssure drive monitoring
6 Troubleshooting General If problems occur during HP LTFS operation, entries may be made in the system log (e.g. /var/log/messages on RHEL systems). Check for entries made with the service name “ltfs”. Both ltfs and mkltfs have command line options to report further details of the operations undertaken, which may be of assistance when trying to troubleshoot problems. If there is a problem with drive interaction, HP LTFS will attempt to create a snapshot of the drive internal state at the time of failure. A snapshot may also be taken at unmount time. • On Linux systems: this will be stored in the system log directory (e.g. /var/log/) and will take the form ltfs_datestamp_timestamp_driveSerialNum.ltd. • On Mac OS X systems: the snapshots are stored in the directory ~/Library/Logs/LTFS/. These files are not otherwise used by HP LTFS and they may safely be removed from the system, if they are not needed for troubleshooting. Note that logs may not be created, and warning messages issued, in either of the following cases: • (a) the ltfs process does not have write permissions for the log directory Resolution: Run ltfs as root, or use the log_directory option to specify a directory for which it does have the required permissions. • (b) the log directory does not exist Shared libraries Resolution: Create the log directory indicated, or use the log_directory option to specify a directory which already exists. On some systems, trying to execute the ltfs command may result in an error message of the form libltfs.so.0: cannot open shared object file: No such file or directory. To resolve this, it is necessary to tell the linker/loader how to locate the required dynamic library files. There are several ways of doing this: • Add /usr/local/lib/ to the environment variable LD_LIBRARY_PATH Or • (As root) Add /usr/local/lib/ to the file /etc/ld.so.conf, and then execute /sbin/ldconfig. Refer to the man pages for ld.so and ldconfig for further details. Drive connection The HP LTFS application requires that the LTO-5 tape drive be powered up and connected to the system. This can be verified using: • Linux: cat /proc/scsi/sg/device_strs • Mac OS X: Use the System Profiler tool (Applications -> Utilities) to check specific devices connected to your SAS controller. If the LTO-5 drive is not shown then check cabling, power etc. HP LTFS will not be able to operate until the drive is detected. General 15
Page 1 and 2: HP StorageWorks HP LTFS Linear Tape
Page 3 and 4: Contents 1 Introduction............
Page 5 and 6: Architecture files. Treating the ta
Page 7 and 8: HPLTFS_BINARIES_SLES11.tar.gz conta
Page 9 and 10: 4 Using HP LTFS How to use LTFS 1.
Page 11 and 12: Table 1 LTFS compatibility LTFS app
Page 13: tape. This status is cleared when a
Page 17 and 18: 7 Frequently asked questions Q: How
Page 19: Table 3 Document conventions (conti

HP LTFS Linear Tape File System user guide

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