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Veeam Backup & Replication 9.5
User Guide for VMware vSphere

Specifying I/O Settings

You can select the data processing mode for VMs and VM disks in jobs (parallel or sequential) and specify task throttling options.

Mind the following:

  • The Enable storage latency control option is available in Veeam Backup & Replication Enterprise and Enterprise Plus Editions.
  • The Set custom thresholds on individual datastores option is available in Veeam Backup & Replication Enterprise Plus Edition only.

To specify data processing settings:

  1. From the main menu, select General Options.
  2. Click the I/O Control tab.
  3. By default, Veeam Backup & Replication uses the parallel data processing mode for VMs and VM disks. To disable parallel processing, clear the Enable parallel processing check box. In this case, Veeam Backup & Replication will process VMs and VM disks sequentially, one by one.
  4. To control the I/O load on the production storage, select the Enable storage latency control check box. When you enable storage latency control, Veeam Backup & Replication monitors storage read latency on production datastores during data protection and disaster recovery activities. To monitor the storage latency, Veeam Backup & Replication uses real-time metrics from the hypervisor. By default, metrics from the hypervisor are collected every 20 seconds. These settings are inherited from VMware vSphere.

Specify two thresholds:

  1. In the Stop assigning new tasks to datastore at field, specify the I/O latency limit at which Veeam Backup & Replication must not assign new tasks targeted at the datastore.
  2. In the Throttle I/O of existing tasks at field, specify the I/O latency limit at which Veeam Backup & Replication must decrease the speed of data retrieval or writing to/from the datastore. When the I/O latency for this datastore reaches this value, the Veeam Data Mover working with this datastore will slow down data retrieval or writing.

The value in the Stop assigning new tasks to datastore at field cannot be greater than the value in the Throttle I/O of existing tasks at field.

Specifying I/O Settings Note:

If you enable the storage control latency option, Veeam Backup & Replication starts processing VM disks residing on the same datastore with a 40-60 second time offset. This offset helps Veeam Backup & Replication evaluate the current I/O load on the datastore. For example, if you launch a job processing a VM with two disks, Veeam Backup & Replication will start processing the first VM disk, wait for 40-60 seconds to evaluate the I/O workload on the datastore, and then start processing the second VM disk.

Keep in mind this behavior. If you schedule jobs that process multiple VM disks residing on the same datastore to start at the same time, the jobs performance will degrade.

Specifying I/O Settings 

You can set the I/O latency limit for every storage in the virtual infrastructure separately.

To set the I/O latency limit for every storage separately:

  1. From the main menu, select General Options.
  2. Click the I/O Control tab.
  3. Click Configure.
  4. Click Add > Datastore, select the necessary datastore and click OK to add it to the storage list.
  5. Select the added datastore(s) in the list and click Edit.
  6. Specify the I/O thresholds for the datastore(s) as described above.

Specifying I/O Settings 

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