IBM TS2340 User Guide - Page 48

Emulate Autoloader, Block Size, Enterprise Tape System 3590, the IBM Magstar MP 3570

Page 48 highlights

AIX Device Driver (Atape) Do not enable autoloading if one of the following conditions is true: v The device is used by an application that provides library medium changer support for the IBM 3581 or IBM 3583. v The device is installed in a 3494 Enterprise Tape Library. v The device is used by an application with stack loader support. v The application is MKSYSB. v The tapes being read were not written using the autoloading feature. Tapes created with AUTOLOAD=YES may not be readable in configurations without Atape autoload enabled, or on other UNIX® operating systems, or on device types/models that are different from the backup device type/model. If the parameter is set to on, then the tape stacker acts as one large virtual tape. During a read, write, or forward space file operation, no end of tape is detected by the application. When the end of tape is reached, the device driver automatically rewinds and unloads the tape, loads the next tape, then continues reading or writing the next tape. The following conditions are required to use this feature: v The autoloading parameter must be set to On. v The cartridge stacker must be loaded with one or more tapes. v The ACF, ACL, or CSL must be set to Automatic, System, or Random mode. This feature allows multivolume backups (with commands such as tar) without prompting for a volume change. The installation default is Off (no autoloading). Emulate Autoloader This parameter controls how the device driver operates when the ACF on the IBM TotalStorage Enterprise Tape System 3590, the IBM Magstar MP tape device, or the IBM 3490E Model Fxx is set to Random mode. If this parameter is set to On and the ACF is in Random mode, the device driver emulates an autoloading tape drive. When an unload command is sent to the device driver to unload a tape, the tape is unloaded, returned to the magazine, and the next tape in the magazine is loaded automatically into the tape drive. If this parameter is set to Off, the normal unload operation occurs, and the tape remains in the drive. The emulate autoloader parameter can be used for legacy applications written for the IBM 3490E Automated Cartridge Loader (ACL) when the IBM TotalStorage Enterprise Tape System 3590, the IBM Magstar MP 3570, or the IBM 3490 Model F autoloader is set to Random mode. This eliminates the need to re-configure the autoloader of the device Random or Automatic operation. The installation default is Off (do not emulate autoloader). Note: On IBM Magstar MP 3570 Models B02, C02, and C12, this feature is supported only when the two drives are configured in Split mode, or in Base mode with only one drive configured and available to AIX. This feature does not work in Base mode if both drives are in the available state to AIX. Block Size This parameter specifies the block size used for read and write operations. A value of zero is the variable block size. Any other value is a fixed block size. 30 IBM Tape Device Drivers Installation and User's Guide

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Do not enable autoloading if one of the following conditions is true:
v
The device is used by an application that provides library medium changer
support for the IBM 3581 or IBM 3583.
v
The device is installed in a 3494 Enterprise Tape Library.
v
The device is used by an application with stack loader support.
v
The application is MKSYSB.
v
The tapes being read were not written using the autoloading feature.
Tapes created with AUTOLOAD=YES may not be readable in configurations
without Atape autoload enabled, or on other UNIX
®
operating systems, or on
device types/models that are different from the backup device type/model.
If the parameter is set to on, then the tape stacker acts as one large virtual tape.
During a read, write, or forward space file operation, no end of tape is detected by
the application. When the end of tape is reached, the device driver automatically
rewinds and unloads the tape, loads the next tape, then continues reading or
writing the next tape. The following conditions are required to use this feature:
v
The autoloading parameter must be set to On.
v
The cartridge stacker must be loaded with one or more tapes.
v
The ACF, ACL, or CSL must be set to Automatic, System, or Random mode.
This feature allows multivolume backups (with commands such as
tar
) without
prompting for a volume change.
The installation default is Off (no autoloading).
Emulate Autoloader
This parameter controls how the device driver operates when the ACF on the IBM
TotalStorage Enterprise Tape System 3590, the IBM Magstar MP tape device, or the
IBM 3490E Model F
xx
is set to
Random
mode. If this parameter is set to On and the
ACF is in Random mode, the device driver emulates an autoloading tape drive.
When an unload command is sent to the device driver to unload a tape, the tape is
unloaded, returned to the magazine, and the next tape in the magazine is loaded
automatically into the tape drive. If this parameter is set to Off, the normal unload
operation occurs, and the tape remains in the drive.
The emulate autoloader parameter can be used for legacy applications written for
the IBM 3490E Automated Cartridge Loader (ACL) when the IBM TotalStorage
Enterprise Tape System 3590, the IBM Magstar MP 3570, or the IBM 3490 Model F
autoloader is set to
Random
mode. This eliminates the need to re-configure the
autoloader of the device
Random
or
Automatic
operation.
The installation default is Off (do not emulate autoloader).
Note:
On IBM Magstar MP 3570 Models B02, C02, and C12, this feature is
supported only when the two drives are configured in
Split
mode, or in
Base
mode with only one drive configured and available to AIX. This feature
does not work in Base mode if both drives are in the available state to AIX.
Block Size
This parameter specifies the block size used for read and write operations. A value
of zero is the variable block size. Any other value is a fixed block size.
AIX Device Driver (Atape)
30
IBM Tape Device Drivers Installation and User’s Guide