SL24 and SL48 are the Oracle’s entry level of Autoloader/Tape Library.

Check here for complete documentation.

L24/48 Library are using a single SCSI ID and two logical unit numbers (LUN). LUN 0 controls the tape drive and LUN 1 controls the robotic. So, its require an HBA that supports multiple LUNs. If multiple LUN support is not enabled, the host server cannot scan beyond LUN 0 to discover the Library. It just sees the tape drive.

To check the device and connectivity status from Solaris, please use the show_FCP_dev option: “cfgadm -o show_FCP_dev -al”, instead of “cfgadm -al” command. The robotic or changer will not shown if you use standard “cfgadm -al” command.
If the changer detected already by “cfgadm -o show_FCP_dev -al” command but still not detected by NBU sgscan command, check your NBU device configuration. You need to modify the st.conf file in order to detect the devices on two LUNs.

[Find the following line in the st.conf file:

name=”st” target=0 lun=0;

Replace that line and the following lines through target 5 with the following. Doing so modifies the st.conf file to include searches on non-zero LUNs:

name="st" target=0 lun=0;
name="st" target=0 lun=1;
name="st" target=1 lun=0;
name="st" target=1 lun=1;
name="st" target=2 lun=0;
name="st" target=2 lun=1;
name="st" target=3 lun=0;
name="st" target=3 lun=1;
name="st" target=4 lun=0;
name="st" target=4 lun=1;
name="st" target=5 lun=0;
name="st" target=5 lun=1;
name="st" parent="fp" target=0;
name="st" parent="fp" target=1;
name="st" parent="fp" target=2;
name="st" parent="fp" target=3;
name="st" parent="fp" target=4;
name="st" parent="fp" target=5;
name="st" parent="fp" target=6;

Click here for complete information on how to configure tape drive and robotic devices for Netbackup.

If the SL24/SL48 has the SAS tape drives and you are using LSI SAS HBA, please check and upgrade the SAS HBA driver.

There was an issue with the LSI SAS1 (3GB) HBA with a firmware level of 1.26.00 and below, where the HBA will not see any SAS devices connected to it. Check below document (MOS access required) for more detail.

HBA – LSI SAS HBA Firmware Issue, SAS Devices Not Being Seen by Server (Doc ID 1350564.1)