| Logical Volume Manager | LVM (can only increase file system size on the fly) | LVM (can increase and also decrease file systems on the fly) |
| JFS | JFS, JFS2 | JFS, ext2 and ext3 (Red Hat), Reiserfs (SuSE) |
| Admin interface | Smit, Smitty, WebSM | Webmin (Openware) redhat-config (Red Hat) YasT2 (SuSE) |
| Boot options | SMS menus (Press 1 or F1), Service Processor menus (Press 1 @beep) | SMS menus (Press 1 or F1), Open Firmware menus (Press 8 or F8) |
| Hardware monitoring | Inventory Scout, diagnostics, error logger | /var/adm/messages, Custom scripts |
| Clustering | HACMP | Cluster Suite (Red Hat) Heartbeat (SuSE) |
| Recovering root access | boot from CD/network to maintenance mode | Boot from CD/network to "Rescue" mode |
| Network install | Network Install Manager (NIM) | Cluster Systems Management (CSM) Kickstart (Red Hat) AutoYaST (SuSE) |
| Image backups | mksysb,sysback | Storix (third party) |
| File system backups | smitty lvm, TSM, sysback | |
| Default shell | ksh | bash |
| Run levels | 0-1 (Reserved) 2 (Multiuser-default) 3-9 ( User preferences) S,s,m,M (Maintenance mode) | 0 (Halt) 1 (Single user mode) 2 (Multiuser-no NFS) 3 (Multiuser-with NFS-default) 4 Unused) 5 (default with X11, xdm) 6 (Reboot) |
| Default window manager | CDE | GNOME,KDE |