[SOLVED] High disk & network activity

[LooneyTunes]

Hi,

what is my server doing? It spiked on disk & incoming network for a minute, then fans went on. Server feels a bit hotter than usual, and have never ever even heard the fan until today, after yesterdays upgrade to v7.0.8...

Found this in syslog. What is this doing please? Looks like it downloaded ~ 3MB...

Jul 08 17:17:01 pve CRON[487876]: pam_unix(cron:session): session opened for user root(uid=0) by (uid=0)
Jul 08 17:17:01 pve CRON[487877]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Jul 08 17:17:01 pve CRON[487876]: pam_unix(cron:session): session closed for user root

Thanks

 

[t.lamprecht]

Hi,

Jul 08 17:17:01 pve CRON[487876]: pam_unix(cron:session): session opened for user root(uid=0) by (uid=0) Jul 08 17:17:01 pve CRON[487877]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) Jul 08 17:17:01 pve CRON[487876]: pam_unix(cron:session): session closed for user root

That's just the hourly CRON job being executed: https://en.wikipedia.org/wiki/Cron But it seems that there was nothing to do this time.

Looks like it downloaded ~ 3MB...

Where do you get that 3 MiB number from?

 

[LooneyTunes]

Where do you get that 3 MiB number from?

Hi,

it looked like it in the traffic graph. I may have misread which is why I wrote 'looks like'. Any idea what the part of the log I posted does?

 

[t.lamprecht]

Any idea what the part of the log I posted does?

as said:

That's just the hourly CRON job being executed: https://en.wikipedia.org/wiki/Cron But it seems that there was nothing to do this time.

It's just a decade old standard tool for running periodic or time-triggered jobs on UNIX like systems, it has a few defaults for hourly, daily, weekly intervals and here it ran the hourly default one, but there was nothing configured to do, so it did an ordinary exit again. The line above and below just comes from the fact that CRON is running in its own session and the authentication mechanism PAM logs that there was a log in like action for root, even if it's just from the local CRON daemon.

 

[LooneyTunes]

as said:

Very sorry. I missed that part of the response. I was trying to find out why activity spiked. Disabling ZFS replication seems to have had effect.
Thanks