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
next prev parent 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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