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From: "Richard W.M. Jones" <rjones@redhat.com>
To: Dongli Zhang <dongli.zhang@oracle.com>
Cc: jsnow@redhat.com, qemu-devel@nongnu.org,
	libguestfs <libguestfs@redhat.com>
Subject: Re: [Qemu-devel] [Libguestfs] How to emulate block I/O timeout on qemu side?
Date: Tue, 6 Nov 2018 09:43:06 +0000	[thread overview]
Message-ID: <20181106094306.GA14842@redhat.com> (raw)
In-Reply-To: <20181106091457.GC4080@redhat.com>

On Tue, Nov 06, 2018 at 09:14:57AM +0000, Richard W.M. Jones wrote:
> This link shows how to combine delay and error filters together:
> 
>   https://rwmj.wordpress.com/2018/11/04/nbd-graphical-viewer/

Oops, that's in a forthcoming blog post not this one.  Not enough
caffeine this morning.

Combining the filters is easy however:

  nbdkit --filter=error --filter=delay \
         memory size=$size \
         rdelay=$delay wdelay=$delay \
         error-rate=100% error-file=/tmp/error

Then touching /tmp/error will inject errors, and removing /tmp/error
will stop injecting errors.

The documentation says you should be able to write error-rate=1
instead of error-rate=100%, but in fact that was broken until
recently, and fixed in:

  https://github.com/libguestfs/nbdkit/commit/ee2d3b4fea6d4b7618262f85f882374c23674b4a

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v

  reply	other threads:[~2018-11-06  9:55 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-02  8:11 [Qemu-devel] How to emulate block I/O timeout on qemu side? Dongli Zhang
2018-11-02 17:49 ` John Snow
2018-11-02 17:55   ` Marc Olson
2018-11-02 18:17     ` John Snow
2018-11-03 17:24       ` Dongli Zhang
2018-11-05 17:13         ` John Snow
2018-11-12  7:13         ` Marc Olson
2018-11-12  7:36           ` Dongli Zhang
2018-11-12 22:52             ` Marc Olson
2018-11-13  0:31               ` Dongli Zhang
2018-11-05 17:49 ` Eric Blake
2018-11-06  6:17   ` Dongli Zhang
2018-11-06  9:14     ` [Qemu-devel] [Libguestfs] " Richard W.M. Jones
2018-11-06  9:43       ` Richard W.M. Jones [this message]
2018-11-06 15:52         ` Richard W.M. Jones

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