From: Dietmar Maurer <dietmar@proxmox.com>
To: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: backup_calculate_cluster_size does not consider source
Date: Tue, 5 Nov 2019 11:02:44 +0100 (CET) [thread overview]
Message-ID: <1767781109.66.1572948164492@webmail.proxmox.com> (raw)
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)
next reply other threads:[~2019-11-05 10:11 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-05 10:02 Dietmar Maurer [this message]
2019-11-06 8:32 ` backup_calculate_cluster_size does not consider source Stefan Hajnoczi
2019-11-06 9:37 ` Max Reitz
2019-11-06 10:18 ` Dietmar Maurer
2019-11-06 10:37 ` Max Reitz
2019-11-06 10:34 ` Wolfgang Bumiller
2019-11-06 10:42 ` Max Reitz
2019-11-06 11:18 ` Dietmar Maurer
2019-11-06 11:22 ` Max Reitz
2019-11-06 11:37 ` Max Reitz
2019-11-06 13:09 ` Dietmar Maurer
2019-11-06 13:17 ` Max Reitz
2019-11-06 13:34 ` Dietmar Maurer
2019-11-06 13:52 ` Max Reitz
2019-11-06 14:39 ` Vladimir Sementsov-Ogievskiy
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