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Overview

HwameiStor provisions two kind of local volumes: LVM and Disk.

As a component of HwameiStor, Local Storage provisions two types of local LVM volumes, such as HA and non-HA.

For the non-HA local LVM volume, it's the best solution for data persistency in the following use cases:

  • Database with HA capability, such as MongoDB, etc.
  • Messaging system with HA capability, such as Kafka, RabbitMQ, etc.
  • Key-value store with HA capability, such as Redis, etc.
  • Others with HA capability

For the HA local LVM volume, it's the best solution for data persistency in the following use cases:

  • Database, such as MySQL, PostgreSQL, etc.
  • Other applications which requires the data with HA features.

Hot backup​

Intra-node hot backup​

It guarantees with raid 5, which can tolerate a set of disk failures.

Control flow is independent of data flow to ensure the stability of data access.

intra-node hot backup

Inter-node hot backup​

It provides protection with raid 5 + active/standby mechanism.

The dce-storage, a dedicated network logical interface for HA, is designed to synchronize storage traffic between nodes. It can synchronously replicate data across nodes to guarantee a hot backup of data.

inter-node hot backup

Rebalance data​

Balanced placement of data in the cluster is achieved through data volume migration technology. Move data online to nodes with more storage space.

data rebalance

Change volume type​

In order to support some special scenarios, a single-replica volume is allowed to be changed to multiple replicas, and inter-node hot backup is supported.

volume change