[DragonFlyBSD - Bug #2819] (In Progress) Random micro system freezes after a week of uptime

bugtracker-admin at leaf.dragonflybsd.org bugtracker-admin at leaf.dragonflybsd.org
Thu May 21 10:55:42 PDT 2015

Issue #2819 has been updated by ftigeot.

Status changed from New to In Progress

The same system with the kern.maxvnodes sysctl set to 300,000 after a fresh reboot doesn't suffer from the micro-freezes after 15 days of uptime.

Bug #2819: Random micro system freezes after a week of uptime

* Author: ftigeot
* Status: In Progress
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
On a file server, the system freeze for a few seconds to more than a minute after aproximately a week of uptime.
The longer the machine stays up, the worse the freezes become. The micro-freezes happen more often and become longer.

It is a complete kernel freeze: characters typed on the console stop appearing on the screen when it happens.
Characters don't stop being displayed when the operating is stopped and the kernel debugger is active, which indicates the problem is not of a hardware origin.

Hardware specs:

- Xeon E5-2620, 64 GB RAM
- Areca RAID controller
- 2x 500GB system disks (RAID 1)
- 11x 2 GB data disks (RAID 5)
- 1x 512 GB SSD (JBOD), used entirely for swap
- 10Gb Intel X540 ethernet adapter

Software configuration:
- swapcache enabled, up to 85% of the available swap size
- deduplication enabled on the data volume

The data volume is used for two things:
- protein sequences
- a rsnapshot backup directory for various servers

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