Installing Connections to Your Library Hardware

Adding the SCSI mchanger Device Driver

The SCSI Media Changer (mchanger) is the device driver that communicates between ACSLS and any SCSI or fibre-attached library on Solaris operating systems. On Linux, ACSLS uses the native sg driver.

For both Solaris and Linux, ACSLS also creates the /dev/mchanger links which you specify when configuring your library hardware to ACSLS.

Adding support for SCSI libraries is an optional part of the installation process. However, there may be times when you must add a new SCSI library, or simply to add SCSI support, to an existing ACSLS installation. You can install the necessary drivers and create mchanger links at any time.

Login to the ACSLS server as root user and enter your password.
Go to the installation directory:
```
cd $ACS_HOME/install
```
Ensure that the SCSI library is functional and physically attached to the ACSLS server.
Note:
(Solaris) Unless multi-pathing hardware has been deliberately configured for the SL500 library, it is important to disable multi-path I/O for any parent device driver such as the "fp" driver that is used in the library connection path. If you have difficulty making a successful connection to the SL500, you should confirm that multi-path I/O has been disabled in your <driver>.conf file, typically /kernel/drv/fp.conf.
```
mpxio-disable="yes"
```
Invoke the appropriate driver installation script:
- Solaris
```
./install_scsi_sol.sh
```
- Linux
```
./install_scsi_Linux.sh 
```

Enabling SL8500 or SL3000 Dual TCP/IP Support

If you have installed the SL8500 or SL3000 library and want to enable dual TCP/IP support, see Dual TCP/IP Support. These sections also discuss the customized routing table entries that you must create.

Synchronizing SL4000 Library and ACSLS Server Clock

Ensure that the SL4000 library clock is synced within a couple minutes of the ACSLS server clock. This is important for communication functionality and filtering of messages related to ACSLS operations and the SL4000 library. Use the Linux date command and the SL4000 GUI to review and sync clocks between them. Alternatively, you can configure NTP functionality for both the ACSLS server and the library. Refer to the SL4000 Library Guide and your operating system publications for more information.

Configuring or Reconfiguring Library Hardware

There are two ways to configure or reconfigure library hardware (new or changed libraries and/or tape drives):

acsss_config

This command must be run while ACSLS is down. Use acsss_config:
- For your initial (first time) configuration of library hardware
- To remove ACSs
- To change or remove port connections to a library
- To reconfigure Fibre or SCSI-attached libraries
Dynamic Configuration (config) utility

Run this utility while ACSLS remains running. Use config for all changes except those excluded above. The config utility:
- Adds new libraries
- Updates TCP/IP-attached library configurations
- Adds port connections, LSMs, CAPs, and drives