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I have a DV server from MediaTemple and lately our server is slowing at the same time every day. It is not due to a traffic increase or anything like that. The slow down lasts 2-3 hours.

It seems like everything takes longer to respond and download from the server. A simple 50kb image takes 1-2 seconds instead of being instant.

MediaTemple can not tell what is causing the slow down. Server resources are good, cpu usage is very low, plenty of disk space.

Any ideas what can cause something like this like clock work every day? Something hidden that wouldn't be detected by MediaTemple?

Clint Chaney
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  • Can you run a benchmark on storage IO during the slowdown and at normal times? – Dylan Knoll Aug 18 '16 at 23:28
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    Take a look at what you have in your crontab and cron.daily – gview Aug 18 '16 at 23:45
  • You should also monitor the connection to the server with a tool such as `mtr` and look if there is a slow down or packet loss when things go bad. – Julie Pelletier Aug 19 '16 at 00:12
  • Thanks, I'll check those things. It's just so frustrating. According to server statistics we are using like no resources. It seems the response time is just totally delayed. – Clint Chaney Aug 19 '16 at 00:45
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    Yes, benchmark on storage IO, e.g. with iostat. Hunch: Nightly backups? – user1521620 Aug 19 '16 at 08:23
  • That's what we thought at first but MediaTemple says no. Could this be a spam bot trying to user our email or would that be reflected in server stats (cpu, memory, etc.)? – Clint Chaney Aug 19 '16 at 14:22
  • I would imagine MediaTemple would pick something like that up but you could check `/var/log/maillog` in case. Did you check crontab and cron.daily as @gview suggested? – I_GNU_it_all_along Aug 19 '16 at 15:17

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