Stefan Hajnoczi <stefa...@redhat.com> 于2022年8月30日周二 03:44写道： > > On Fri, Aug 26, 2022 at 11:15:29PM +0800, Sam Li wrote: > > Zoned Block Devices (ZBDs) devide the LBA space to block regions called > > zones > > that are larger than the LBA size. It can only allow sequential writes, > > which > > reduces write amplification in SSD, leading to higher throughput and > > increased > > capacity. More details about ZBDs can be found at: > > > > https://zonedstorage.io/docs/introduction/zoned-storage > > > > The zoned device support aims to let guests (virtual machines) access zoned > > storage devices on the host (hypervisor) through a virtio-blk device. This > > involves extending QEMU's block layer and virtio-blk emulation code. In its > > current status, the virtio-blk device is not aware of ZBDs but the guest > > sees > > host-managed drives as regular drive that will runs correctly under the most > > common write workloads. > > > > This patch series extend the block layer APIs with the minimum set of zoned > > commands that are necessary to support zoned devices. The commands are - > > Report > > Zones, four zone operations and Zone Append (developing). > > > > It can be tested on a null_blk device using qemu-io or qemu-iotests. For > > example, the command line for zone report using qemu-io is: > > $ path/to/qemu-io --image-opts -n > > driver=zoned_host_device,filename=/dev/nullb0 > > -c "zrp offset nr_zones" > > > > v8: > > - address review comments > > * solve patch conflicts and merge sysfs helper funcations into one patch > > * add cache.direct=on check in config > > Hi Sam, > I have left a few comments.
That's great! Thanks for reviewing. I'll send a revision soon. Sam
