Minimum free disk space <10% performance hit??

From: Richard Bemrose <rb237_at_phy.cam.ac.uk>
Date: Wed, 22 Apr 1998 13:43:01 +0100 (BST)

Hi all,

On large capacity volumes (>9Gb and above) what sort of throughput
performance hit should we expect for minimum free space threshold less
than 10%. According to the man page [tunefs(8)]: "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.

Do I really need to reserve 10% on a 23Gb disk? This results in
reducing the capacity by 2.3Gb! Or perhaps I should reserve a certain
amount? Say,
   reserve 0.4Gb (or 10%) on a 4Gb disk capacity
   reserve 0.4Gb (or 2%) on a 23Gb disk capacity

Any comments would be appreciated and summarised.

Regards,
Rich

 /_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ _ \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\
/_/ Richard A Bemrose /_\ Polymers and Colloids Group \_\
/_/ email: rb237_at_phy.cam.ac.uk /_\ Cavendish Laboratory \_\
/_/ Tel: +44 (0)1223 337 267 /_\ University of Cambridge \_\
/_/ Fax: +44 (0)1223 337 000 /_\ Madingley Road \_\
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 /_/_/_/_/_/_/ http://www.poco.phy.cam.ac.uk/~rb237 \_\_\_\_\_\_\
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Received on Wed Apr 22 1998 - 14:48:23 NZST

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