Do Not Load Solaris 11.4 SRU 24 !
If running HSM and have the storage archive manager configured using tape I/O, do not upgrade to the Solaris 11.4 SRU 24.
Engineering recently found a bug in the st tape driver, in that specific Solaris 11.4 SRU 24 release. It causes tape loading to fail and drives mounts to never complete or become ready.
NOTE: this bug is not found in the previous SRU 23 or below.
Reference Oracle Support Document 2710852.1 (Tape Drive Will Not Mount and Become Ready After Solaris 11.4.24 Upgrade) for further information on the topic.