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Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu |
Date: |
Wed, 13 May 2020 13:25:54 +0100 |
User-agent: |
Mutt/1.13.4 (2020-02-15) |
* Paolo Bonzini (address@hidden) wrote:
> On 13/05/20 13:26, Daniel P. Berrangé wrote:
> > Are you referring to the in-kernel NFS client hangs here ? AFAIK, it is
> > impossible to do anything to get out of those hangs from userspace, because
> > the thread is stuck in an uninterruptable sleep in kernel space.
> >
> > If using the in-QEMU NFS client, then there is a network connection that
> > can be yanked just like the NBD client.
>
> But it's a bad idea to yank it (and also the NBD client) because you're
> not sure which wites have made it to the server (and to the medium) and
> which haven't.
No, that's OK - if you look at the COLO case, and some other cases,
you've got a dead storage device but your redundant pair might be OK;
so it's OK to yank it.
Other similar storage cases are trying to migrate a VM that has one dead
disk, even if you know and accept it's dead and unresponding, you often
can't kill it off if the device is hung.
> Effectively, the in-QEMU NFS client and NBD client are always operating
> in "soft" mode, but we should always treat that as a bug (which cannot
> be fixed) and not a feature for read-write images.
Dave
>
> Paolo
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, (continued)
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Lukas Straub, 2020/05/12
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Kevin Wolf, 2020/05/13
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Dr. David Alan Gilbert, 2020/05/13
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Kevin Wolf, 2020/05/13
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Daniel P . Berrangé, 2020/05/13
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Paolo Bonzini, 2020/05/13
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu,
Dr. David Alan Gilbert <=
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Kevin Wolf, 2020/05/13
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Kevin Wolf, 2020/05/13
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Dr. David Alan Gilbert, 2020/05/13
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Daniel P . Berrangé, 2020/05/13
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Dr. David Alan Gilbert, 2020/05/13
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Eric Blake, 2020/05/13
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Kevin Wolf, 2020/05/13
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Eric Blake, 2020/05/13
- Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Lukas Straub, 2020/05/11
Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu, Lukas Straub, 2020/05/11