[CentOS] system unresponsive

[Thomas Bendler]

You should be able to recognize or monitor this by configure the syslog to
print everything on a specific TTY or use the remote logging functionality.

Kind regards Thomas

Am Do., 23. Mai 2019 um 18:31 Uhr schrieb Jon Pruente <
jpruente at riskanalytics.com>:

> On Wed, May 22, 2019 at 10:02 AM mark <m.roth at 5-cent.us> wrote:
>
> > That seems unlikely. Foe one, I've seen that... but I *always* see
> entries
> > in the log about the oom-killer being invoked. For another, this isn't a
> > compute node, it's *only* a fileserver, serving projects, home
> > directories, and backups (home-grown b/u, uses rsync), and backups don't
> > start until well after midnight, and as we're business-hours only, there
> > was less usage, and it does have 256G RAM....
> >
>
> I have two servers that would lock up like this occasionally, and if I let
> them sit at the console long enough sometimes they would give a login
> prompt. It took a lot of time and frustration (these are prod servers) but
> I tracked it down to a problem in the XFS driver, as it never occurred on
> the systems with EXT4 filesystems. The XFS driver would hang, preventing
> writes to the filesystem. I could identify exactly when that happened as
> all system logging would suddenly stop at the same second. Then OOMKiller
> would come in and start killing off processes but that wouldn't be in the
> logs on disk because the file system couldn't write. I rolled the servers
> back to a 5xx series kernel and the issue didn't resurface. I recently let
> them boot the newer 9xx series kernels and I'm hoping the XFS issue is
> fixed.
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