[Dovecot] IMAP-proxy or not with sogo webmail and dovecot backend

[Jan-Frode Myklebust]

On Mon, Feb 13, 2012 at 09:57:31PM +0200, Timo Sirainen wrote:
> > 
> > 	$ doveconf maildir_very_dirty_syncs
> > 	maildir_very_dirty_syncs = yes
> > 
> > but I don't think this gave the advantage I was expecting.. Was
> > expecting this to move most iops to the index-luns, but the maildir
> > luns seems just as busy.
> 
> This setting should get rid of almost all readdir() calls. If it doesn't, something's not working right.


With maildir_very_dirty_syncs = yes:

ReadMB/s  WriteMB/s	F_open	f_close	reads	writes	rdir	inode
  1.5	  0.0		96	92	514	73	9	7
  1.2	  0.0		59	43	367	18	4	76
  1.7	  0.0		66	61	477	67	2	6
  1.2	  0.0		54	50	348	31	1	145
  3.0	  0.0		113	90	860	59	7	8
  2.9	  0.0		107	99	840	58	5	11
  4.0	  0.0		131	101	1117	77	2	65

With maildir_very_dirty_syncs = no (same node, a few seconds later):

ReadMB/s  WriteMB/s	F_open	f_close	reads	writes	rdir	inode
  4.6	  0.9		125	91	1161	1096	41	6
  2.3	  0.7		200	170	697	127	86	16
  1.1	  0.6		124	99	406	61	48	109
  2.7	  0.1		212	144	755	114	74	15
  2.7	  0.0		159	133	818	70	78	194
  0.8	  1.2		86	73	225	60	16	9
  1.9	  0.0		124	116	573	53	30	6

So it seems to be working, good :-)


  -jf