A Volume Provision Policy specifies the attributes that are necessary to create a new physical volume (PV) at the time of deploying a Stateful service. gopaddle supports provisioners for cloud storage, network attached and local storage.

Provisioners supported by gopaddle:

  1. AWS EBS
  2. Azure Persistent Disk
  3. Google Cloud - Persistent Disk
  4. NFS Share
  5. Storidge Disk

For more information on Kubernetes Cloud Provisioners, click here.

Steps to create a Volume Provision Policy

  1. In the left navigation panel, select Storage Policies and select Provision Policies
  2. Choose Create new policy to open the policy creation wizard. 
  3. Choose a Storage Provider and the corresponding attributes of the provision policy.
If the Cloud provider supports zones, then the PVs can be provisioned across multiple zones. While deploying a Stateful Service to a Cluster, at least one provisioner zone must match with the Cluster node pool zones.

AWS Volume Policy

EBS Types

gopaddle supports  both SSD Backed EBS Volumes (io1 & gp2) for transactional workloads that involve small, random I/O for better IOPs, and HDD Backed EBS Volumes (sc1 & st1) for streaming workloads that involve large, sequential I/O for better throughputs.

  • Provisioned IOPS SSD (io1) - I/O-intensive transactional workloads, particularly database workloads, that are sensitive to storage performance and consistency
  • General Purpose SSD (gp2) - cost-effective storage that is ideal for a broad range of workloads 
  • Throughput Optimized HDD (st1) - Suitable for large, sequential I/O and frequently accessed data, for example, Amazon EMR, ETL, data warehouses, and log processing
  • Cold HDD (sc1) - Inexpensive block storage for infrequent data access. It is suitable for large, sequential cold-data workloads. 

For more information on AWS EBS Storage options click here

File System Types

Supported file system types are Ext3 and Ext4

Volume Retain Policy

  • Retain - Retains the Volume when the Service instance is deleted, so that it can be mounted again by another Service instance of the same Service configuration.
  • Delete - Deletes the Volume when the Service instance is deleted.

Google Cloud - Persistent Disk

Persistent Disk Types

pd-standard is a HDD based storage that is optimal for handling sequential read/write operations, but they aren't optimized to handle high rates of random input/output operations per second (IOPS).  pd-ssd is suitable for random access with higher IOPS. Supported types are :

  • pd-standard (HDD)
  • pd-ssd

Zones 

One or more zones across the same region or across different regions.

Replication across regions

Volumes are replicated across two zones in the same region. If only one zone is provided in the Zones field, Google arbitrarily chooses another zone to replicate the volume. If two zones from the same region are provided, then Google replicates the volume across those two zones.

File System Types

Supported file system types are XFS and Ext4

Volume Retain Policy

  • Retain - Retains the Volume when the Service instance is deleted, so that it can be mounted again by another Service instance of the same Service configuration.
  • Delete - Deletes the Volume when the Service instance is deleted.

Azure - Persistent Disk

Storage Account Type

  • Standard_LRS

Resource Group

 Disk will be placed in the same resource group as the current Kubernetes cluster.

Storage Kind

  • Shared - An unmanaged disk created in one of the available shared storage account. Storage accounts have limitation on the IOPS and the number of VMs in a single storage account. 
  • Managed -  block-level storage volumes which are created under Azure managed Storage Account. Managed Storage Disks provide additional benefits in terms of increase number of disks, granular access control, flexibility and durability. 
  • Dedicated - An unmanaged disk created in a dedicated storage account

Volume Retain Policy

  • Retain - Retains the Volume when the Service instance is deleted, so that it can be mounted again by another Service instance of the same Service configuration.
  • Delete - Deletes the Volume when the Service instance is deleted.

NFS Share

In order to use the NFS Share Storage Provider, the NFS Provisioner must be pre-registered in the portal. To register the NFS Provisioner, follow the steps here.

Volume Archive Policy 

Volume Archive Policy is the same as the Retention Policy. 

  • Archive - Retains the volume even after the Service instance is deleted, so that it can be mounted again by another Service instance of the same Service configuration.
  • Delete - Deletes the Volume when the Service instance is deleted.

Storidge Disk

File System Types

Supported file system types are btrfs, XFS and Ext4

IOPs

Minimum and Maximum IOPs for SSD based storage disks

Redundancy Level

Number of redundant volumes to maintain. It must be a value in the range 1-3

Provision 

  • Thin - Provisions the disk based on the initial capacity required and gradually grows the disk as the requirement increases
  • Thick - Provisions the disk upfront based on the complete capacity requirement

Snapshots

When Snapshotting is enabled, the Snapshot Interval specifies the interval in minutes between consecutive snapshots. The Maximum Number of Snapshots specifies the number of snapshots to maintain, which must be in the range of 1 - 99.

Volume Retain Policy

  • Retain - Retains the Volume when the Service instance is deleted, so that it can be mounted again by another Service instance of the same Service configuration.
  • Delete - Deletes the Volume when the Service instance is deleted.

For more information on Storidge Disk, please check the link here.

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