>
>
>> The general reply to this that you don't need an entry in /etc/disktab
>> anymore. disklabel -rw /dev/rrz#c foo will figure out the geometry information.
>> I installed our disk without problem. A good hint from Herve Demarthe suggested me
>> to change default spare space from 10% to 1% when newfsing. That avoid 900 Mbytes
>> lost in 9GB disk.
>
>Be careful. If i remeber right (must check out the sources),
>there's a technical reason for 10%.
>The badest thing which can happen ignoring this mark is a loss of speed.
>
>Greetings
>.//. Arne
>
>--
>Arne Steinkamm | Smart: arne_at_oldman.eikon.e-technik.tu-muenchen.de
>Tel.: +49.89.299.756 | IRC: Arne
>Robert-Koch-Str. 4 |\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
>D-80538 Muenchen |///////////////////////////////////////////////////
Good point. Has anybody experienced the kind of penalty intruduced by changing
the default spare space? I read the manaul page about tunefs, it says:
-m minfree
Specifies the percentage of space held back from normal users;
the minimum free space threshold. The default value used is 10%.
This value can be set to zero, however up to a factor of three in
throughput will be lost over the performance obtained at a 10%
threshold. Note that if the value is raised above the current
usage level, users will be unable to allocate files until enough
files have been deleted to get under the higher threshold.
I have two file systems already running with 1% spare space, I will create one with
10% and do some tests when I get chance. But, if somebody has already done the
sort of thing, please share your opinions
thanks a lot,
Xueshsan
--
Susan Feng (aka. Xueshan Feng) | Tel.: (510) 643 5048
Unix System Manager | Email: sf_at_ced.berkeley.edu
College of Environmental Design | Fax: (510) 642 7560
UC Berkeley, CA 94705 | Voicemail: (510) 643 5048
Received on Thu Jan 12 1995 - 13:15:59 NZDT