Re: [9fans] venti and "contrib": RFC

[erik quanstrom <quanstro@quanstro.net>]

> For reference, I set up our current Plan 9 system about half a year
> ago.  We have 3.8 TB of Venti storage total.  We have used 2.8 GB of
> that, with basically no precautions taken to set anything +t; in
> general, if it's around at 4 a.m., it's going into Venti.  I figure we
> have roughly another 2,000 years of storage left at the current rate
> :)

in 10 years, we've managed to store only 645gb of stuff in ken fs.  so duplicates
are stored as dupes.  large chunks of it are email (from the pre nupas days)
or imported from even older systems.  the worm is only 3tb.

the system was built last nov with the then-the-best-option 1tb drives.  today,
the whole worm could be put on 2 drives with raid 10.  in 2 years, when it's
time to replace the drives, the worm should be less than 2/3 full, assuming
<~300% year/year acceleration in storage used.

my personal system, a mere 6 years old, only has about 12.5gb of junk.
(in a 1500gb worm!).  and drives are ripe for replacement.

by the way, in thinking a bit more about the BER and scrubbing, my
3 raids have been scrubbing continuously for 3 years and, (so that's
hundreds of times) except when i actually had a bad disk, i have not
seen URE.

- erik