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[71.33.221.154]) by smtp.gmail.com with ESMTPSA id v17sm7348828ilq.49.2020.04.07.12.13.26 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Apr 2020 12:13:26 -0700 (PDT) To: qemu-devel@nongnu.org From: Tim Haley Subject: Domain backup file explodes on s3fs Message-ID: <0d78c593-7b5d-5f73-ea05-e81d9bc35373@gmail.com> Date: Tue, 7 Apr 2020 13:13:25 -0600 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::d29 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi all, Have been playing with `virsh backup-begin` of late and think it's an excellent feature. I've noticed one behavior I'm not sure I understand. Am doing pretty straight-forward backup of boot disk: # cat bx # cat cx 2aa450cc-6d2e-11ea-8de0-52542e0d008a # virsh backup-begin 721 bx cx If my /backups directory is just XFS, I get a backup file that looks like it is just the size of data blocks in use -rw------- 1 root root 2769551360 Mar 19 16:56 vda.2aa450cc-6d2e-11ea-8de0-52542e0d008a but if I write to an s3fs (object storage backend) the file blows up to the whole size of the disk -rw------- 1 root root 8591507456 Mar 18 19:03 vda.2aa450cc-6d2e-11ea-8de0-52542e0d008a Is this expected? If it's relevant, this is on ubuntu and # virsh version Compiled against library: libvirt 6.1.0 Using library: libvirt 6.1.0 Using API: QEMU 6.1.0 Running hypervisor: QEMU 4.2.0 thanks for any ideas, -tim