[auton-users] /mnt/userdirs Reminder

Michael J. Baysek mjbaysek at cs.cmu.edu
Sun Apr 12 11:17:08 EDT 2009


There are two situations you should prefer the userdirs partition to 
BigPapa.


1)  High performance storage.  Reading and writing many files, or very 
large files, as in the case of text processing, userdirs should be used 
because the performance is much faster than BigPapa.


2)  Large amount of storage.   Or temporary shared [shared among LOPs] 
storage.


Also, there are compelling reasons not to store "vital" data in the 
userdirs partition. 


1) The no-quota nature of this partition lets you write more data than 
you could to your BigPapa home directory.  This sounds great, but keep 
in mind, so can everyone else.  This means that other people's activity 
does have a greater chance of affecting you on the userdirs partition 
than it does on BigPapa.


2) It higher chance for downtime and data loss than BigPapa.  The 
userdirs partition was put into service an ad-hoc solution to supply 
much needed disk space.  It does not have the fault tolerance that 
BigPapa has.   You should be reminded of this when you consider storing 
mission critical data there.





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