ZFS server has gone crazy slow

[Robert Clausecker]

Hi Chris,

What does zpool status say about the pool?  Also check if the SMART values
of these disks are okay.

Yours,
Robert Clausecker

On Sat, Apr 11, 2020 at 05:36:37PM +0000, Chris Ross wrote:
> I have a FreeBSD 11.3-STABLE server that is my router, using a ZFS
> mirror (of two GPT disks) as it’s disk.  It’s many years old, and has
> only been misbehaving like this for a day or so.  I’m trying to figure
> out what’s wrong.
> 
> I confirmed that internet connectivity isn’t the problem, and a reboot
> didn’t fix it.  (The reboot took 10-15 minutes to finish going
> multi-user, starting daemons, due to the underlying problem described
> below.)
> 
> Truss’ing a very basic command (date), I can see that close() and
> exit() calls are taking 1-2 seconds.  All of the files being opened
> are on ZFS, but I don’t know if that’s for sure related.  Similarly,
> using shell builtin “echo foo” always is immediate, but “/bin/echo”
> sometimes works quickly, but sometimes the close() on
> /var/run/ld-elf.so.hints takes 3-5 seconds.
> 
> I _think_ this is a filesystem problem.  It’s very hard to diagnose
> because logging in, and doing anything, takes many seconds per
> command.  zpool status shows my mirror as online, so I’m not sure
> where I should check.
> 
> I’d appreciate any help!  Thanks much…
> 
>            - Chris
> 
> 
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