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Where do write ops take place?
Maybe mount that path to a RAM disk rather than looking for anorher solution.

> 
> Am 10.12.2019 um 15:50 schrieb Wojciech Puchar via dovecot <dovecot at dovecot.org>:
> 
> what FTP module should i use instead of squat that is probably no longer supported or no longer at all?
> 
> i want to upgrade my dovecot installation. it currently uses squat but i found it often crashes on FTS on large mailboxes.
> 
> i found "xapian" addon for dovecot but while it works excellent AFTER database is created, i found it need like 20 or so minutes to index less than 10GB of mails and while doing this - generate many tens of megabytes/s constant write traffic on it's database files.
> 
> Excellent way of killing SSD.
> 
> something must be broken.
> 
> my config is
> 
> plugin {
>        plugin = fts fts_xapian
> 
>        fts = xapian
>        fts_xapian = partial=2 full=20 verbose=0
> 
>        fts_autoindex = yes
>        fts_enforced = yes
> 
> #       fts_autoindex_exclude = \Junk
> #       fts_autoindex_exclude2 = \Trash
> }
> 
> 
> any ideas?