Re: Could you please explain a warning message
Thanks for your reply - I am reassured. My server is a slow machine with limited memory - not much better than a Raspberry Pi, but designed to run 24/7 - so it is not surprising that processes will conflict from time to time. One warning in eight months is more than acceptable :-) Thanks again Allen C On 08/10/18 12:03, Ralf Hildebrandt wrote: > * Allen Coates : >> Yesterday I saw the following warning message in my logs:- >> >> 2018-10-06T14:11:19+01:00 geronimo postfix/postscreen[8194]: warning: >> psc_cache_update: btree:/var/lib/postfix/postscreen_cache update average >> delay is 151 ms > > Oct 2 02:01:40 mail-cbf postfix/postscreen[23257]: warning: > psc_cache_update: btree:/var/lib/postfix/postscreen_cache update average > delay is 343 ms > Oct 2 02:03:16 mail-cbf postfix/postscreen[23257]: warning: > psc_cache_update: btree:/var/lib/postfix/postscreen_cache update average > delay is 155 ms > Oct 3 18:34:07 mail-cbf postfix/postscreen[23257]: warning: > psc_cache_update: btree:/var/lib/postfix/postscreen_cache update average > delay is 137 ms > Oct 8 11:21:19 mail-cbf postfix/postscreen[65199]: warning: > psc_cache_update: btree:/var/lib/postfix/postscreen_cache update average > delay is 112 ms > > Quoting from > http://postfix.1071664.n5.nabble.com/psc-cache-update-td10059.html > > "It is a bit sluggish. The warning threshold is 100ms. It should not > take this long to insert one key/pair into the database. Perhaps your > system's disk is very busy, or you're on a VM slice, or your clock is > not stable. If this happens frequently you need to find out why." > > and > > "If this happens often, this means that postscreen cannot handle > more than 10 SMTP connections per second, or that your system clock > is jumping (as in: running inside a VM). > > I see the warning once a day on my lightly-loaded server with a > single 15kRPM disk under an ancient CPU; the timing suggests that > this happens while some cron job is doing house cleaning. > > I added this check because someone insisted on running postscreen > on top of an SQL database, and complained that postscreen performance > was erratic. After I added the warning he stopped complaining." >
Re: Could you please explain a warning message
* Allen Coates : > Yesterday I saw the following warning message in my logs:- > > 2018-10-06T14:11:19+01:00 geronimo postfix/postscreen[8194]: warning: > psc_cache_update: btree:/var/lib/postfix/postscreen_cache update average > delay is 151 ms Oct 2 02:01:40 mail-cbf postfix/postscreen[23257]: warning: psc_cache_update: btree:/var/lib/postfix/postscreen_cache update average delay is 343 ms Oct 2 02:03:16 mail-cbf postfix/postscreen[23257]: warning: psc_cache_update: btree:/var/lib/postfix/postscreen_cache update average delay is 155 ms Oct 3 18:34:07 mail-cbf postfix/postscreen[23257]: warning: psc_cache_update: btree:/var/lib/postfix/postscreen_cache update average delay is 137 ms Oct 8 11:21:19 mail-cbf postfix/postscreen[65199]: warning: psc_cache_update: btree:/var/lib/postfix/postscreen_cache update average delay is 112 ms Quoting from http://postfix.1071664.n5.nabble.com/psc-cache-update-td10059.html "It is a bit sluggish. The warning threshold is 100ms. It should not take this long to insert one key/pair into the database. Perhaps your system's disk is very busy, or you're on a VM slice, or your clock is not stable. If this happens frequently you need to find out why." and "If this happens often, this means that postscreen cannot handle more than 10 SMTP connections per second, or that your system clock is jumping (as in: running inside a VM). I see the warning once a day on my lightly-loaded server with a single 15kRPM disk under an ancient CPU; the timing suggests that this happens while some cron job is doing house cleaning. I added this check because someone insisted on running postscreen on top of an SQL database, and complained that postscreen performance was erratic. After I added the warning he stopped complaining." -- [*] sys4 AG https://sys4.de, +49 (89) 30 90 46 64 Schleißheimer Straße 26/MG, 80333 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
Could you please explain a warning message
Yesterday I saw the following warning message in my logs:- 2018-10-06T14:11:19+01:00 geronimo postfix/postscreen[8194]: warning: psc_cache_update: btree:/var/lib/postfix/postscreen_cache update average delay is 151 ms A tenth of a second is an ENORMOUS delay for an SSD, and my immediate thought was/is an incipient disc failure, but the monthly disc tests say 95 percent of the life expectancy remains. I have swept my logs since February and this is the only instance of the message. I am operating a domestic server (50 messages a day), running on a Synology NAS device, with things in the background I can't turn off. Could someone please explain what this message implies. Many thanks Allen C Perhaps I should get some back-ups done :-)
