dealing with mke2fs -T option

Ionel GARDAIS ionel.gardais at tech-advantage.com
Mon May 28 11:57:41 UTC 2007


Hi Theodore,

Thanks for your help.
When trying to use the -i switch for 32Mb files, here is the output :

$ mke2fs -j -b 4096 -E stride=16 -m 1 -i 33554432 /dev/sde
mke2fs: bad inode ratio 33554432 (min 1024/max 8192

Ionel


Theodore Tso wrote:
> On Sun, May 27, 2007 at 10:30:18PM -0400, Bryan Kadzban wrote:
>   
>> The -T option exists to tweak the number of entries available in the
>> inode table, based on the size of the filesystem.
>>     
>
> The -T option tweaks more than just the number of inodes in the inode
> table, actually.  It can control other things as well, including the
> blocksize and what features are enabled.  Check out the mke2fs.conf
> man page, on moderately recent versions of e2fsprogs.  You can
> customize what different filesystem types mean, so if you want to make
> some new filesysstem type which is especially useful in your
> environment (i.e., "oracle_tablespace") you can do so.  If you think
> it might be generally useful, let me know and I might include it in
> the default /etc/mke2fs.conf file. 
>
>   
>> If there's a variant of -T that takes an explicit size-per-created-inode
>> value, then I'd try that, with 32Mb as the size-per-created-inode.  (Or
>> possibly 16Mb, to give yourself some wiggle room.)  OTOH, the
>> "largefile4" option is probably fairly close to what you want, too: it
>> leaves some space available if you create some smaller files, and
>> (AFAIK) having 8 times as many inodes available doesn't waste much disk
>> space.
>>     
>
> Youc an specify the the inode-ratio explicitly using the -i flag to
> mke2fs, or if you know exactly how many inodes you want, you can
> specify the exact number of inodes in the inode table using the -N
> option.  It's all in the mke2fs man page....
>
> 							- Ted
>   

-- 
Ionel GARDAIS
System-Network Engineer

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