[Gluster-users] Need help on performance issue

[Eliezer Croitoru]

Hey Jack,

I asked since I have been trying to use GlusterFS based storage for my 
local very-tiny mailserver and it was kind of a disaster.
There was only one mailserver mounting the volume and many times it took 
about ages to sync a directory.
Sometimes I had an issue which caused all sort of index errors in the 
dovecot log.

Eventually what I did was to mount the FS image file ontop of a 
glusterfs the same as many do for VMs.

The FS is fast and redundant but lacks that ability to be flexible for 
growth in couple aspects.

My glusterfs nodes are very small with 4gb ram, quad-core coreI5, 2TB 
disk at each machine for replication.
It's a very tiny machine and I am considering replacing it with a tiny 
Lenovo IOMEGA NAS due to abusive power consumption.

Using maildir that stores lots of tiny files might be the main issue of 
the high I/O and related issue(while was not researched enough).

About the high I/O on one node and not the other..
It is possible that most of the load is distributed on one node more 
then the other kind of randomly.

What is the size of the mail server?(in terms of GB and INODES, df -i && 
du -h)

Eliezer

On 06/30/2014 09:41 AM, MySystem 365 wrote:
> It is Qmailtoaster using vpopmail -Maildir structure.
> We also notice that sometimes g1 is at high I/O and then g2 is low or it
> takes turn.
>
> Regards
> Jack Marc