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Starting November 2023 Percona XtraBackup 2.4 has reached EOL status. If you have 5.7 databases, we encourage you to upgrade to 8.0 and then install Percona XtraBackup 8.0. Learn more

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Throttling Backups
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    • Home
      • About Percona XtraBackup
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      • Installing Percona XtraBackup 2.4
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      • Connection and Privileges Needed
      • Configuring xtrabackup
      • The Backup Cycle - Full Backups
      • Incremental Backup
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      • Percona XtraBackup User Manual
      • Throttling Backups
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        • Release notes index
        • Percona XtraBackup 2.4.29 (2023-12-18)
        • Percona XtraBackup 2.4.28 (2023-04-04)
        • Percona XtraBackup 2.4.27 (2022-12-06)
        • Percona XtraBackup 2.4.26
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        • Percona XtraBackup 2.4.24
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        • Percona XtraBackup 2.4.20
        • Percona XtraBackup 2.4.19
        • Percona XtraBackup 2.4.18
        • Percona XtraBackup 2.4.17
        • Percona XtraBackup 2.4.16
        • Percona XtraBackup 2.4.15
        • Percona XtraBackup 2.4.14
        • Percona XtraBackup 2.4.13
        • Percona XtraBackup 2.4.12
        • Percona XtraBackup 2.4.11
        • Percona XtraBackup 2.4.10
        • Percona XtraBackup 2.4.9
        • Percona XtraBackup 2.4.8
        • Percona XtraBackup 2.4.7-2
        • Percona XtraBackup 2.4.7
        • Percona XtraBackup 2.4.6
        • Percona XtraBackup 2.4.5
        • Percona XtraBackup 2.4.4
        • Percona XtraBackup 2.4.3
        • Percona XtraBackup 2.4.2
        • Percona XtraBackup 2.4.1
      • The xtrabackup Option Reference
      • The innobackupex Option Reference
      • The xbcloud Binary
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      • The xbcrypt binary
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    Throttling Backups¶

    Although xtrabackup does not block your database’s operation, any backup can add load to the system being backed up. On systems that do not have much spare I/O capacity, it might be helpful to throttle the rate at which xtrabackup reads and writes data. You can do this with the xtrabackup --throttle option. This option limits the number of chunks copied per second. The chunk size is 10 MB.

    The image below shows how throttling works when xtrabackup --throttle is set to 1.

    image

    By default, there is no throttling, and xtrabackup reads and writes data as quickly as possible. If you set too strict of a limit on the IOPS, the backup may slow down so much that it will never catch up with the transaction logs that InnoDB is writing, and the backup might never be complete.

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