[CentOS] What FileSystems for large stores and very very large stores?

OK so back to the issue in hands.
The issue is that I have a mail storage for more then 65k users per
domain and the ext4 doesn't support this size of directory list.
The reiser FS indeed fits for the purpose but ext4 doesn't even start to
scratch it.
Now the real question is that:
What FS will you use for dovecot backhand to store a domain with more
then 65k users?

Eliezer

On 07/05/2013 04:45 PM, Eliezer Croitoru wrote:
> I was learning about the different FS exists.
> I was working on systems that ReiserFS was the star but since there is 
> no longer support from the creator there are other consolidations to be 
> done.
> I want to ask about couple FS options.
> EXT4 which is amazing for one node but for more it's another story.
> I have heard about GFS2 and GlusterFS and read the docs and official 
> materials from RH on them.
> In the RH docs it states the EXT4 limit files per directory is 65k and I 
> had a directory which was pretty loaded with files and I am unsure 
> exactly what was the size but I am almost sure it was larger the 65k 
> files per directory.
> 
> I was considering using GlusterFS for a very large storage system with 
> NFS front.
> I am still unsure EXT4 should or shouldn't be able to handle more then 
> 16TB since the linux kernel ext4 docs at: 
> https://www.kernel.org/doc/Documentation/filesystems/ext4.txt in section 2.1
> it states: * ability to use filesystems > 16TB (e2fsprogs support not 
> available yet).
> so can I use it or not?? if there are no tools to handle this size then 
> I cannot trust it.
> 
> I want to create a storage with more then 16TB based on GlusterFS since 
> it allows me to use 2-3 rings FS which will allow me to put the storage 
> in a form of:
> 1 client -> HA NFS servers -> GlusterFS cluster.
> 
> it seems to more that GlusterFS is a better choice then Swift since RH 
> do provide support for it.
> 
> Every response will be appreciated.
> 
> Thanks,
> Eliezer
> 
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