[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: qemu-img create with preallocation=full and cluster-size=2M produces
|
From: |
Alberto Garcia |
|
Subject: |
Re: qemu-img create with preallocation=full and cluster-size=2M produces a bad file |
|
Date: |
Fri, 11 Sep 2020 16:55:08 +0200 |
|
User-agent: |
Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu) |
On Fri 11 Sep 2020 04:30:45 PM CEST, Bryan S Rosenburg wrote:
> $ qemu-img --version
> qemu-img version 4.2.0 (Debian 1:4.2-3ubuntu6.4)
> Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
>
> $ qemu-img create -f qcow2 prealloc_4G_2M.qcow2 4G -o
> preallocation=full,cluster_size=2M
> Formatting 'prealloc_4G_2M.qcow2', fmt=qcow2 size=4294967296
> cluster_size=2097152 preallocation=full lazy_refcounts=off
> refcount_bits=16
>
> $ qemu-img check prealloc_4G_2M.qcow2
> ERROR: coffset=0x1ffff80a00000: copied flag must never be set for
> compressed clusters
I can reproduce that problem with 4.2.0 from Ubuntu but not with QEMU
3.1.0 nor with the latest master (post-5.1.0). I will investigate, it
looks like it would need a fix for Ubuntu LTS.
Berto