[Dovecot] Howto add another disk storage

Stan Hoeppner stan at hardwarefreak.com
Fri Jul 6 07:04:42 EEST 2012

On 7/5/2012 6:36 AM, Wojciech Puchar wrote:
>> At 16TB+ scale with maildir you should be using XFS on kernel 3.x, not
>> EXT4.  Your performance will be significantly better, as in 30% or much
> why you want to make 16TB partition at first place?

You wouldn't partition the large LUN.  You'd simply directly format it
with XFS.  Laying a partition table on it would introduce the real
possibility of filesystem misalignment on the RAID stripe if one wasn't
extremely careful about the partitioning alignment.

But your question seems to relate to reason for using a single very
large filesystem.  In which case the answer is typically a single file
tree/name space.  EXT3/4 and Reiser apparently aren't super reliable at
very large sizes.  XFS has no such negative issues at large scale, and
in fact was specifically designed for extremely large scale.  As I
mentioned previously, 50TB+ XFS filesystems are mundane and there are
many 100TB+ in the wild.

As with any small scale filesystem, you'll need a backup system capable
of handling your very large XFS filesystem and a proper strategy.


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