IIRC, ext3 and LVM allows for dynamic filesystem expansion. I run Fedora and OpenSUSE on Intel. I've never had any command "knock the system down". The only times that I reboot are: (1) new kernel; (2) power failure beyond my small home UPS's capacity. Yast is a fairly good system administration tool, perhaps akin to smit or smitty (If I remember what an AIX sysprog that I once knew talked about). I don't know what the admin tool is on RHEL. Oh, did your AIX person know that JFS runs on Linux? I think that is the same filesystem as used by AIX (not really sure). I think your AIX person may be a bit behind the time on the latest Linux feature. Having said that, AIX is likely more mature, maybe more stable. If you want stable, z/OS simply cannot be beaten (well, maybe that old Tandem NONSTOP).
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