Creating a QoS Policy in VAST Web UI
From the left navigation menu, select Element Store and then QoS Policies.
Click Create QoS Policy to open the Add QoS Policy dialog.
In the General tab:
Enter a name for the QoS policy in the Name field.
Select the QoS policy type:
Depending on your choice, either View or User tab is now available, where you can make further settings.
To create a QoS policy for a view, complete the fields in the View tab:
In Limit QoS by, leave Read/Write (default) to be able to set different QoS limits per operation type (one for reads and another for writes), or select Total if you want to set QoS limits that cap the total amount of read, write and metadata operations.
Under Static Limits, specify static QoS limits per view.
For each of the limits , '0' means no limit is set.
Select an appropriate unit of measurement in the Units field.
To restrict the bandwidth, fill in the fields following the BW column:
To restrict the amount of IOPS, fill in the fields following the IOPS column:
Note
If no credits are explicitly defined, setting a maximum static limit will cause the corresponding credits to accept a default value. The credit default value will be the maximum limit multiplied by 4.
Under Capacity Limits, specify capacity-based QoS limits per unit of used or provisioned logical capacity.
Choose whether you want to limit Used Capacity or Provisioned Capacity.
Note
Leaving the default value of None means no capacity-based limits are used.
Enter the limits in the fields below.
For each of the limits , '0' means no limit is set.
Read BW per GB. Maximum read bandwidth (in MB/s) to provision per GB of used or provisioned logical capacity.
Read IOPS per GB. Maximum read IOPS to provision per GB of used or provisioned logical capacity.
Write BW per GB. Maximum write bandwidth (in MB/s) to provision per GB of used or provisioned logical logical capacity.
Write IOPS per GB. Maximum write IOPS to provision per GB of used or provisioned logical capacity.
To create a QoS policy for one or more users, complete the fields in the User tab:
Determine the scope of the user QoS policy:
Set Use as default QoS policy if you want the policy to apply to all users.
Under Static Performance Limits, specify static QoS limits for user(s):
Select an appropriate unit of measurement in the Units field,
Enter the limits in the fields below.
For each of the limits , '0' means no limit is set.
To restrict the bandwidth, fill in the fields following the BW column, separately for Read and Write operations:
To restrict the amount of IOPS, fill in the fields following the IOPS column, separately for Read and Write operations:
Under S3 Client Connections Limits, optionally set the overall limit on S3 connections for the user. This limit restricts the total number of S3 connections that can be opened by the user to the VAST cluster (across all CNodes).
To set the limit, click Set Manually and enter the maximum allowed number of S3 connections to the cluster in the field provided.
If you do not want to set the limit, use the default of Unlimited.
Under S3 Client Connections Limit per CNode, optionally set the CNode percentage limit on S3 connections for the user. This limit restricts the amount of CNode connection capacity that the user is allowed to consume, for any CNode in the cluster.
NOTE: The CNode percentage limit can be set with VAST Cluster 5.4.6 and later.To set the limit, click Set Manually and enter the maximum allowed percentage of the CNode connection capacity in the field provided.
If you do not want to set the limit, use the default of Unlimited.
Click Create.
The QoS policy is created and can be assigned to views or users respectively.