> > All of the data is an /dev/sda1 > > What filesystem is this?
ext4 > I did a bunch of testing, and after initially thinking I saw an > increase it was just due to bad testing because the new TCP_NODELAY > changes allowed imaptest to do more work. So I can't see that there is > any disk IO difference. > > There are a few intentional changes to lib-index and also mdbox > code. One of those is that dovecot.index.cache files are being > recreated more often now. In some cases they were wasting a lot of > disk space because expunged mails hadn't been removed from them. I > guess it's a possibility that all the disk IO was because in your > system Dovecot started recreating all those files at the same time. > Maybe you could try upgrading again during slower hours and see if the > disk IO normalizes after a while? Still running 2.3.7. Looking at the disk IO graphs today's IO usage looks OK! I restarted dovecot yesterday after fixing the FTS settings: Jul 16 10:14:45 mail-cbf dovecot: master: Dovecot v2.3.7 (494d20bdc) starting up for imap, lmtp (core dumps disabled) after that I saw quite a bit of IO on sda1 (a bit of data read, lot of write), which subsided at11:30 After that diskio was low, up to the present day. -- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebra...@charite.de | https://www.charite.de