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James - DO / FreeBSD hanging?

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Oct 12th, 2016
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  3. As always i'll start with the obligatory congrats on show, I've not missed an episode yet, so keep up the good work.....
  6. I've recently migrated from a UFS FreeBSD 10.1 droplet over to a new ZFS backed FreeBSD 10.3 for the obvious benefits. I migrated my 6+ jails from ezjail over to IOCage with very little issue. Having now run the ZFS droplet for a month or so, I will occasionally find that the droplet becomes unresponsive. Jails running nginx no long respond to HTTPs, I'm unable to SSH in to the host and access via the HTML 5 console is frozen. My only option is to power down and restart the droplet. Having move to ZFS I thought it was about time to up the memory from the 512 to 1GB. As Allan will probably remind us, this is very little RAM for ZFS plus processes such as nignx and dare I say MariaDB as well. That said, having looked at resource usage around the time, everything seems normal. DO already tune vfs.zfs.arc_max="128M" and vfs.zfs.vdev.cache.size="5M" which was my first port of call. So my question is, where would you start diagnosing the underlying cause. What is the logical course of action to get to the bottom and fix whatever is causing my droplet to fall over.
  9. Thanks as always
  11. James
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