ok, I did install zstd (zstd command line interface 64-bits v1.4.4,
by Yann Collet)
reconfigured & compiled dovecot
2.3.10.1
again with option : with-zstd
changed the configuration file to :
zlib_save = zstd
and restarted dovecot -
now I have following log file errors :
Aug 28 16:17:39 lxc-imap dovecot:
imap(rnowotny)<237930><H1kft/CtENRUclcc>: Error:
zlib_save: Unknown handler: zstd
Aug 28 16:17:44 lxc-imap dovecot:
imap(rprager)<237939><p5hst/Ct8evAqKhu>: Error:
zlib_save: Unknown handler: zstd
Aug 28 16:17:44 lxc-imap dovecot:
imap(rprager)<237940><Vp5st/Ct8uvAqKhu>: Error:
zlib_save: Unknown handler: zstd
Aug 28 16:17:44 lxc-imap dovecot:
imap(rprager)<237941><U31tt/Ct8+vAqKhu>: Error:
zlib_save: Unknown handler: zstd
...
what I do wrong here ?
Am 28.08.2020 um 13:15 schrieb Timo
Sirainen:
On 28. Aug 2020, at 12.10, Robert Nowotny <rnowotny@rotek.at>
wrote:
unfortunately
after re-installing 2.3.11.3, those broken-pipe errors appear again.
(on different, new files)
so for sure there is something broken with zlib.
I will go back to 2.3.10.1 now.
attached is the configuration file, though it did not
change between 2.3.10.1 and 2.3.11.3
Oh, this is with xz, not with gz like we first thought.
There are some known problems with xz, which is why we are
planning on removing it entirely. I'm not sure why v2.3.11
breaks it, although there are some changes related to it but
it might be coincidence. I can't reproduce this problem
though.
In any case, I'd recommend switching to zlib or to zstd in
v2.3.12. (In theory you could leave the existing mails
xz-compressed, but best would be to re-compress everything via
dsync so old mails can be read when we eventually remove xz
support.)