On 02/17/2016 11:13 AM, Chris wrote:
is it possible to save 5000 folders in the same directory (ext4 FS)
without any performance issues?
It's a Maildir structure with a .-separator, e.g.
/var/vmail/public/folder1
/var/vmail/public/folder1.subfolder1a
/var/vmail/public/folder1.subfolder1b
...
Would it be better to use "real" subfolders with / as separator?
The Wikipedia ext4 article indicates that 5,000 subdirectories should be
possible:
https://en.wikipedia.org/wiki/Ext4
Increasing the 32,000 subdirectory limit
In ext3 a directory can have at most 32,000 subdirectories.
Ext4 allows an unlimited number of subdirectories.[16] To allow for
larger directories and continued performance, ext4 turns on HTree
indexes (a specialized version of a B-tree) by default. ...
As for performance, my WAG is that file system directory accesses are a
tiny fraction of the overall workload for normal mail server operations,
so you could pick either directory structure and performance will be
essentially the same. If you need to quantify performance, then you'll
have to find or devise meaningful benchmarks.
David
