On 8/08/2023 12:37 am, Jon Perryman wrote:
Automount was created specifically to address some filesystem
blemishes. There's a problem they needed to solved and they allowed
people to continue without the use of automount. For those who choose
automount, they decided that with all its faults, it solved more
problems than it created.
IBM didn't create automount. It was a standard unix thing before IBM did
unix. IBM just came up with the idea of HSM migrating home directories
as a use case.
The primary problem with individual filesystems is that freespace
doesn't get returned to the system. Deleted a file? The space still
can't be used by someone else. If you accidentally fill up your
filesystem, when you delete the file after all those "growing
filesystem" messages: congratulations, you own the empty space.
The secondary problem is that migrating filesystems makes file and
directory level management impractical.
# du --sh /home/*
# find /home -size 2G
Don't even think about it, unless you like HSM recalls.
File level backup also gets complicated when filesystems are migrated.
Pretty much all the problems that automounted individual filesystems are
supposed to solve are actually a result of having individual
filesystems. They don't have to be solved on other platforms because
they didn't create them in the first place (or there is a better
solution e.g. quotas).
--
Andrew Rowley
Black Hill Software
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