I tried locking=off, it supports qcow2 -drive file.filename=r 0605-share.img,format=qcow2,if=none,id=drive-virtio-disk1,cache=directsync,aio=native,file.locking=off
Thank you very much. BR Chang Limin -----Original Message----- From: Max Reitz [mailto:mre...@redhat.com] Sent: Thursday, October 26, 2017 3:33 PM To: changlimin 00148 (Cloud); Fam Zheng Cc: qemu-devel@nongnu.org; Qemu-block Subject: Re: [Qemu-devel] Block format 'raw' does not support the option 'locking' when disable image locking with option locking=off On 2017-10-26 09:18, Changlimin wrote: > If the qcow2 file is created with preallocation=full, I think metadata will > not corrupt when it is shared between two vms? Snapshot is not required. > > Is this right? I wouldn't count on it. If you really want to take the risk, you can probably use the file.locking=off option again. Max
