Re: 11.4 on what hardware?
We had an old SPARC machine that ran with virtually no issue for around 15 years when it was finally retired around 5-10 years ago. After age around 10 if it ever was rebooted you had to use the cheat-sheet to get it to boot off the correct partition as the (soldered in) CMOS BIOS battery had gone. Sun hardware was really good then.
Last hardware we had was one of the Sun-turning-into-Oracle storage appliances, poor software that was not properly developed or bug-fixed and unresponsive support. Really, we would have been better with FreeNAS/TrueNAS on some cheaper hardware!
After then we ran down the Sun stuff as no intention of getting in to Oracle's grasp and Linux did everything well enough not to need it.