On 2026/05/19 17:49, Stefan Hajnoczi wrote: > Damien: Do real zoned block devices guarantee that the updated write > pointer is persisted only after appended data has written been > persisted?
Yes, they do. Write data first, then persist the write pointer. Note that when there is data (write) caching, the write pointer can show the data as "written", but in that case, a power loss will result in returning to the last position of written data. Persistence of the write pointer happens always after the data is persisted on media. qcow2 image should be the same. -- Damien Le Moal Western Digital Research
