Modify IOPS and bandwidth limits

You can easily specify quality of service limits for individual application instances by defining limits for IOPS and Bandwidth. To modify vDisk IOPS and bandwidth limits for an application instance, follow these steps. If you are a VDC manager user, you can set these limits for the application instances in the virtual datacenters to which you have access. Infrastructure admin users can set these limits for any application instance.

Note:

These limits are useful for Quality of Service (QoS) monitoring and maintaining performance predictability of running workloads. (IOPS and bandwidth limits are unlimited by default.) Storage QoS limits ensure that the application instance does not consume more than the specified limit of IOPS or bandwidth. Other factors, including your specific workload and other workloads running on the storage block, may prevent your application instance from reaching these limits.

When you update these limits, it may take some time for the system to respond; for example, it could take up to three to five minutes for you to see results.

Complete the following steps to modify the IOPS and bandwidth limits for a vDisk:

  1. Log in to the ThinkAgile CP Cloud Controller as an infrastructure admin or VDC manager user.
  2. Expand the VDC that contains the application instance and click VDC Instances.
    Figure 1. VDC instances page
    Screen capture of the VDC instances page
  3. Click the application instance to display the details for that instance. Then click the Profile tab.
    Figure 2. Profile tab
    Screen capture of the Profile tab for an application instance
  4. Scroll down to the Storage section and click the Actions menu (Screen capture of the Actions menu icon) for the vDisk to be resized.
    Figure 3. Actions menu

  5. Complete the following steps to modify or set the IOPS limit for a vDisk:
    1. Click Edit IOPS limit to display the Edit IOPS Limit dialog.
      Figure 4. Edit IOPS Limit dialog box

    2. On the IOPS Limit drop-down, select Custom.
    3. Enter a value for I/O per second and click Save. (The minimum value you can enter is 50.)
  6. Complete the following steps to modify or set the Bandwidth limit for a vDisk:
    1. On the actions menu for the vDisk, click Edit bandwidth limit to display the Edit Bandwidth Limit dialog box opens.
      Figure 5. Edit Bandwidth Limit dialog box

    2. On Bandwidth Limit drop-down menu, select Custom.
    3. Enter a value for MB per second and click Save. (The minimum value you can enter is 5 MBps.)