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[Qemu-devel] [Bug 583296] Re: I/O errors with qemu-nbd/qcow2
From: |
Shehbaz Jaffer |
Subject: |
[Qemu-devel] [Bug 583296] Re: I/O errors with qemu-nbd/qcow2 |
Date: |
Sun, 10 Mar 2013 05:52:19 -0000 |
Hi,
I tried this with qemu-img version 1.0, Ubuntu 12.04 host and gentoo guest,
with qcow2 disk image.
This seems to work fine. Perhaps it was fixed in the new qemu-img versions.
address@hidden:~$sudo dd if=/dev/nbd0 of=/dev/null bs=1M
8192+0 records in
8192+0 records out
8589934592 bytes (8.6 GB) copied, 185.003 s, 46.4 MB/s
address@hidden:~$
Did you try working with some other disk image? Did this issue get
resolved already? Perhaps more information will be required to debug
this now.
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https://bugs.launchpad.net/bugs/583296
Title:
I/O errors with qemu-nbd/qcow2
Status in QEMU:
New
Bug description:
I tried to open a qcow2 file with qemu-nbd and backup the files in it.
After some coping I get lot of I/O errors in dmesg and the system
hangs. One time I got even a kernel panic (Of course on a productive
Server ;-) )
How to reproduce:
1. Connect nbd to a qcow2 file, a virtual machine mustn't use this file:
qemu-nbd --connect=/dev/nbd0 /mnt/qcow/andromeda.qcow2
2. Read some data from /dev/nbd0p1
dd if=/dev/nbd0p1 of=/dev/null bs=1M
After a few Seconds till Minutes somethings crash's
Attached some dmesg logs
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- [Qemu-devel] [Bug 583296] Re: I/O errors with qemu-nbd/qcow2,
Shehbaz Jaffer <=