On Mon, 11 Mar 2002 Art Hickman <[log in to unmask]> wrote:
>I have a HP 3000 989 KS 450.  I have a set of disk drives called AMG_DATA.
>It consists of 10 mirrored sets of 1/2 height 18GB drives, with a net
>useable of about 150GB,
>
>Does any one have a white paper on the maximum % you can fill these drives
>before you would run into disk crashes or panic mode shutdowns?

Since these drives are part of a user volume set rather than the system
volume set you can fill them to 100% of their configured capacity without
*MPE* having problems; i.e., the OS doesn't need you to reserve space on
user volume sets other than what applications might need to allocate
there.  Processes which try to allocate disc space will get errors if there
is no room to allocate space on the appropriate volume set, but that will
happen if you bump into the maximum permanent allocation configured on the
drives, even if it's the defaut (75%).

I recommend setting the "max permanent" setting to 100% on all drives in a
user volume set, unless you want to set an artificial lower limit so
if/when the error appears you can manually "expand the drive" for the short
term and either reduce consumption or increase suppply in the long term.
In my opinion, however, a better solution is to set the limit to 100% and
manage the space by monitoring the usage freqeuently enough that it's never
exhausted.

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