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Re: [Qemu-block] [PATCH v3 12/18] block/backup: add 'always' bitmap sync
From: |
Max Reitz |
Subject: |
Re: [Qemu-block] [PATCH v3 12/18] block/backup: add 'always' bitmap sync policy |
Date: |
Tue, 9 Jul 2019 20:46:24 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 |
On 05.07.19 22:16, John Snow wrote:
> This adds an "always" policy for bitmap synchronization. Regardless of if
> the job succeeds or fails, the bitmap is *always* synchronized. This means
> that for backups that fail part-way through, the bitmap retains a record of
> which sectors need to be copied out to accomplish a new backup using the
> old, partial result.
>
> In effect, this allows us to "resume" a failed backup; however the new backup
> will be from the new point in time, so it isn't a "resume" as much as it is
> an "incremental retry." This can be useful in the case of extremely large
> backups that fail considerably through the operation and we'd like to not
> waste
> the work that was already performed.
>
> Signed-off-by: John Snow <address@hidden>
> ---
> block/backup.c | 27 +++++++++++++++++++--------
> qapi/block-core.json | 5 ++++-
> 2 files changed, 23 insertions(+), 9 deletions(-)
Reviewed-by: Max Reitz <address@hidden>
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- [Qemu-block] [PATCH v3 05/18] block/backup: Add mirror sync mode 'bitmap', (continued)
- [Qemu-block] [PATCH v3 05/18] block/backup: Add mirror sync mode 'bitmap', John Snow, 2019/07/05
- [Qemu-block] [PATCH v3 06/18] block/backup: add 'never' policy to bitmap sync mode, John Snow, 2019/07/05
- [Qemu-block] [PATCH v3 07/18] hbitmap: Fix merge when b is empty, and result is not an alias of a, John Snow, 2019/07/05
- [Qemu-block] [PATCH v3 08/18] hbitmap: enable merging across granularities, John Snow, 2019/07/05
- [Qemu-block] [PATCH v3 09/18] block/dirty-bitmap: add bdrv_dirty_bitmap_merge_internal, John Snow, 2019/07/05
- [Qemu-block] [PATCH v3 10/18] block/dirty-bitmap: add bdrv_dirty_bitmap_get, John Snow, 2019/07/05
- [Qemu-block] [PATCH v3 11/18] block/backup: upgrade copy_bitmap to BdrvDirtyBitmap, John Snow, 2019/07/05
- [Qemu-block] [PATCH v3 12/18] block/backup: add 'always' bitmap sync policy, John Snow, 2019/07/05
- Re: [Qemu-block] [PATCH v3 12/18] block/backup: add 'always' bitmap sync policy,
Max Reitz <=
- [Qemu-block] [PATCH v3 13/18] iotests: add testing shim for script-style python tests, John Snow, 2019/07/05
- [Qemu-block] [PATCH v3 14/18] iotests: teach run_job to cancel pending jobs, John Snow, 2019/07/05
- [Qemu-block] [PATCH v3 15/18] iotests: teach FilePath to produce multiple paths, John Snow, 2019/07/05
- [Qemu-block] [PATCH v3 16/18] iotests: Add virtio-scsi device helper, John Snow, 2019/07/05
- [Qemu-block] [PATCH v3 18/18] block/backup: loosen restriction on readonly bitmaps, John Snow, 2019/07/05
- [Qemu-block] [PATCH v3 17/18] iotests: add test 257 for bitmap-mode backups, John Snow, 2019/07/05