Re: Large disk partition over 300GB

Miquel van Smoorenburg (miquels@cistron.nl)
12 Jul 1999 23:55:02 +0200

In article <cistron.slrn7okoe4.l8j.marc_news@magic.merlins.org>,
Marc MERLIN <marc_news@merlins.org> wrote:
>On 10 Jul 1999 22:30:01 -0700, Jeff - <jeff9n@hotmail.com> wrote:
>>disk is about 320GB. But the file system only see roughly 265GB. Is this a
>>limitation with the kernel or the file system? It is expected that the
>>capacity of the formatted partition will be less. But in this case the loss
>>is around 55GB (~ %18) which is quite significant.
>
>Reformat your partition with:
>mke2fs -b 4096 -i 16384 -m 0 -s 1 /dev/device
>
>You may want to read the mke2fs and decide whether you want to decrease -i a
>bit and maybe set -m to 1 instead of 0.

Ofcourse you realize that setting -m to 1 or worse, 0, will result
in a badly fragmented disk when it fills up and really bad performance.

The reason that 5% of disk space is reserved is to always have some
room left. The ext2 allocation algorithm needs this to prevent fragmentation.

The -b 4096 is good advice though, it should be the default on partions
bigger than 100 MB or so. -i 16384 also isn't bad if you don't plan on
storing lots (and that is _lots_) of small files.

Mike.

-- 
Beware of Programmers who carry screwdrivers.


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