Changes I enjoyed.
- Logical Volume Manager: I don't miss working with partitions. I love mirroring and being able to migrate live filesystems.When mirroring came along I was able to sleep more.My first LVM was on AIX, so I enjoyed having the entire system handled by an LVM. Solaris took forever to catch up. Now all UNIX OSes have an LVM.
- SAN: I don't even have to worry about mirroring any more, on the OS level. I can add, remove, grow and move disks dynamically.
- Virtualization: VMWare, KVM, AIX Lpars, I can dynamically change the processors and memory with a command line.
- LVM+SAN+Virtualization: can migrate a server from one piece of hardware to another with a command line.
- 64 bit: Large files over 2GB was such a relief and it was nice being able to use more memory on a large server.
- Hot pluggable devices: Less downtime.