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Re: [PATCH 0/3] Add support for sequential backups

From: Stefan Reiter
Subject: Re: [PATCH 0/3] Add support for sequential backups
Date: Mon, 14 Sep 2020 13:46:27 +0200
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Friendly ping :)

On 8/26/20 2:13 PM, Stefan Reiter wrote:
Backups can already be done for multiple drives in a transaction. However, these
jobs will start all at once, potentially hogging a lot of disk IO all at once.
This problem is made worse, since IO throttling is only available on a per-job

Add a flag to QMP to support sequential transactions for backups. This way,
every job will be executed one after the other, while still providing the
benefit of transactions (i.e. once one fails, all remaining ones will be

We've internally (in Proxmox VE) been doing sequential backups for a long time
with great success, albeit in a different fashion. This series is the result of
aligning our internal changes closer to upstream, and might be useful for other
people as well.

Stefan Reiter (3):
   job: add sequential transaction support
   blockdev: add sequential mode to *-backup transactions
   backup: initialize bcs bitmap on job create, not start

  block/backup.c        |  4 ++--
  blockdev.c            | 25 ++++++++++++++++++++++---
  include/qemu/job.h    | 12 ++++++++++++
  job.c                 | 24 ++++++++++++++++++++++++
  qapi/transaction.json |  6 +++++-
  5 files changed, 65 insertions(+), 6 deletions(-)

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