I have util-linux upgrade that I need to do on redhat 4 ent. Does this going to interruption with the operation of the OS or application? Or this will be straight forward upgrade that will not make a harm or downtime of the OS.
Some of those upgrades affect low-level code. Some require a reboot. A lot of them are for security problems. I would say very probably yes - kick everybody off the system. Reboot to runlevel 1. Do a backup before applying it. This is what I have always done when doing a kernel/OS update.
It just means that you get to do what most sysadmins do, work at 1:00am on Sunday. When you can close off system access and not have users screaming about it.
Yes but this is not a kernel upgrade. Support always told me that the only reboot you need to do is a kernel upgrade, others are online upgrade most of the time. But since this is a utilities, which have many binaries. Maybe this will have exception.