Hi Richard, many thanks for you answer. yes, this solution did we discuss as well. For a future testing system I will try this. But I can't use it on the living system in the moment. Regards Rainer
Richard Hobbs wrote:
Hello,
You might also want to enable "noatime" in the mount options for the volume housing the data... if you're using maildir, this *could* reduce the number of writes by half, theoretically!
Richard.
Robert Schetterer wrote:
Rainer Sigl schrieb:
Hi List, on my mailserver (exim4, dovecot 1.0.0, postgresql, ubuntu dapper, about 500 users) I record an enourmous amount of disc writes (up to 18000 blocks written each second) in the time where most of users are active. This IO activity causes wait-states on the disc interface (RAID5) and finally slows down my mailmachine. Is there a explanation for these disc writes respectively is there a possibility to minimize this activity. Stopping Dovecot on this machine causes stopping most of the disc activity.
Regards Rainer Sigl
Hi Rainer first you should upgrade to the latest stable of the 1.x branch or better 1.1.x, also dapper is very old perhaps try hardy
then retest, i run 2000 users on suse with dovecot 1.0.15 and mysql on sata 3ware hardware raid 1 500 GB on ext3 without any problems
--
Rainer Sigl, | email: sigl@mpe.mpg.de MPI f. extraterrestrische Physik, | phone: +49 (89) 30000-3557 Postfach 1312, | fax: +49 (89) 30000-3569 D-85741 Garching, Germany | web: http://www.mpe.mpg.de/~sigl/