On Tue, Nov 05, 2019 at 11:02:44AM +0100, Dietmar Maurer wrote: > Example: Backup from ceph disk (rbd_cache=false) to local disk: > > backup_calculate_cluster_size returns 64K (correct for my local .raw image) > > Then the backup job starts to read 64K blocks from ceph. > > But ceph always reads 4M block, so this is incredibly slow and produces > way too much network traffic. > > Why does backup_calculate_cluster_size does not consider the block size from > the source disk? > > cluster_size = MAX(block_size_source, block_size_target)
CCing block maintainers so they see your email and you get a response more quickly. Stefan
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