Sun Microsystems StorEdge L400, Инструкция по установке и эксплуатации

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6-12 Sun StorEdge L400 Installation and User’s Guide • April 1998
6.9.1 Sequential Mode
Sequential mode allows the tape cartridges to be accessed serially. This is the most
advanced mode supported by the Sun operating system without use of Networker/
Solstice Backup or similar application. When a tape is ejected from the drive the next
tape in the magazine is placed in the drive. In a two drive library, one half of the
tapes in the magazine are used in one drive and one half in the other drive. This
effectively creates a unit that appears like one very long tape. This is useful for
simple backup and restore operations such as ufsdump.
1. To automatically load the first tape into the drive, use the Operator Panel to select
the Restart option.
Restart 1 loads the tape into the first drive. Restart 2 loads into the second drive.
2. To enable the unit to move to the next tape after ejecting a tape, use the Operator
Panel to select one of the sequential modes.
■
Sequential 1 for the first drive.
■
Sequential 2 for second drive.
■
Dual Sequential for use of two drives simultaneously.
3. To enable the unit to eject a tape from the drive, use:
■
mt -f /dev/rmt/x offline
[replace ’x’ with the drive number] or
■
use the
l
flag with
ufsdump
.
Access to the on-line man(ual) page is via
man ufsdump
.
4. To load the first tape after ejecting the last, use the front panel controls to select
the Loop option.
There is both a loop 1 for the first drive and a loop 2 for the second drive.
6.9.2 Random Access Mode
The random access method allows access to any tape in the library. Sun does not
provide a driver in the standard OS to provide this functionality. A random access
driver and a full backup application utility is offered in the Solstice Backup program.
This is a version of the Legato Networker utility. This multi-function utility provides
various capabilities, including backup operations while the system is running. It
does not require the system to be shut down like some other utilities.
6.9.3 Manual Modes
The third method is to place the tapes manually into an internal drive using
commands from the front panel.