Re: [Qemu-devel] [PATCH v4 2/3] block/backup: avoid copying less than full target clusters

2016-02-25 Thread Fam Zheng
On Thu, 02/25 15:58, John Snow wrote: > During incremental backups, if the target has a cluster size that is > larger than the backup cluster size and we are backing up to a target > that cannot (for whichever reason) pull clusters up from a backing image, > we may inadvertantly create unusable inc

[Qemu-devel] [PATCH v4 2/3] block/backup: avoid copying less than full target clusters

2016-02-25 Thread John Snow
During incremental backups, if the target has a cluster size that is larger than the backup cluster size and we are backing up to a target that cannot (for whichever reason) pull clusters up from a backing image, we may inadvertantly create unusable incremental backup images. For example: If the