mke2fs options for very large filesystems

Tue Feb 8 15:00:16 UTC 2005

Just as a side note but do you really want to reserve 5%
of your 2TB partition for root?

Another side question on this. Is it possible to make mkfs
accept non-integer values for the reserved percentage?
It is getting to the point these days where partitions
are getting so big that even 1% is becoming quite a waste.
However it would still be good to have some space reserved.

Andreas Dilger wrote:
> On Feb 07, 2005  09:58 -0800, Jeffrey W. Baker wrote:
> 
>>Wow, it takes a really long time to make a 2TB ext2fs.  Are there
>>better-than-default options that could be used for a large filesystem?
>>
>>mke2fs 1.34 (25-Jul-2003)
>>Filesystem label=
>>OS type: Linux
>>Block size=4096 (log=2)
>>Fragment size=4096 (log=2)
>>244203520 inodes, 488382016 blocks
>>24419100 blocks (5.00%) reserved for the super user
>>First data block=0
>>14905 block groups
>>32768 blocks per group, 32768 fragments per group
>>16384 inodes per group
>>Superblock backups stored on blocks: 
>>        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
>>        4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 
>>        102400000, 214990848
> 
> 
> Yes, if you are creating larger files.  By default e2fsck assumes the average
> file size is 8kB and allocates a corresponding number of inodes there.  If,
> for example, you are storing lots of larger files there (digital photos, MP3s,
> etc) that are in the MB range you can use "-t largefile" or "-t largefile4"
> to specify an average file size of 1MB or 4MB respectively.  You can also
> use -i or -N (see man page) to override the default bytes-per-inode value.
> This will also speed up e2fsck noticably.
> 
> Cheers, Andreas
> --
> Andreas Dilger
> http://sourceforge.net/projects/ext2resize/
> http://members.shaw.ca/adilger/             http://members.shaw.ca/golinux/
> 
> 
> 
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