Re: [discuss] shutdown hang with zpools on ISCSI devices

["Joshua M. Clulow" <josh@sysmgr.org>]

On Mon, 5 Aug 2024 at 22:29, Carsten Grzemba via illumos-discuss
<discuss@lists.illumos.org> wrote:
> I have an additional SMF service in place which should export the zpool on shutdown before iscsi-initiator is gone and on boot import after iscsi-initiator is in place. But if the shutdown not work in that kind, the zpools are in zfs cache at next boot.

If you want to do this on your own, then I suspect you would want to
set the "cachefile" property to "none".  According to zpool(8) this
would prevent the kernel from writing the pool's configuration to the
system cache file.  Presumably that would prevent it being imported
automatically.

At boot you could explicitly import the pools you want, and at
shutdown you could presumably export them before networking goes down.

> But I noticed that zones will also attempt to shutdown if I run 'reboot' where I thought that no attempt was being made to stop any services.

I believe to get that behaviour, you need to use "reboot -q".  As per reboot(8):

    -q
        Quick. Reboot quickly and ungracefully, without
        shutting down running processes first.


Cheers.

-- 
Joshua M. Clulow
http://blog.sysmgr.org