Overview of a parity group

REST API Reference Guide for Virtual Storage Platform 5000, Virtual Storage Platform E Series, and Virtual Storage Platform G/F Series

Version
93-07-0x
90-09-0x
88-08-10
Audience
anonymous
Part Number
MK-98RD9014-17
A parity group is a set of physical drives that configure a RAID in a storage system.

A logical storage area extracted from a parity group is used as an LDEV (basic volume). To create an LDEV to be used for operations such as volume allocation or pool creation, you need to create a parity group in advance.

Parity group operations performed by the REST API vary depending on the type of storage system.

For VSP E series
  • Creating a parity group

    You can create a parity group when installing a new storage system or adding drives. You can configure a distributed parity group, or specify settings to encrypt a parity group or specify copy-back mode.

  • Changing the drive settings

    You can assign a specified drive as a spare drive, or release the assignment. The spare drive is used when a failure occurs in a drive that configures a parity group.

  • Formatting a parity group

    You can format all volumes created from a parity group. When you create multiple volumes at the time a new storage system is installed or drives are added, you can collectively format the volumes.

  • Deleting a parity group

    You can delete a parity group. If the specified parity group is a parity group making up a distributed parity group, all concatenated parity groups are deleted.

For VSP G350, G370, G700, G900, VSP F350, F370, F700, F900
  • Creating a parity group

    You can create a parity group when installing a new storage system or adding drives. You can configure a distributed parity group, or specify settings to encrypt a parity group or specify copy-back mode.

  • Changing the drive settings

    You can assign a specified drive as a spare drive, or release the assignment. The spare drive is used when a failure occurs in a drive that configures a parity group.

  • Changing the accelerated compression setting of a parity group

    You can enable or disable the accelerated compression setting for a parity group for which the accelerated compression function is supported.

  • Formatting a parity group

    You can format all volumes created from a parity group. When you create multiple volumes at the time a new storage system is installed or drives are added, you can collectively format the volumes.

  • Deleting a parity group

    You can delete a parity group. If the specified parity group is a parity group making up a distributed parity group, all concatenated parity groups are deleted.

For VSP 5000 series
  • Changing the accelerated compression setting of a parity group

    You can enable or disable the accelerated compression setting for a parity group for which the accelerated compression function is supported.

  • Formatting a parity group

    You can format all volumes created from a parity group. When you create multiple volumes at the time a new storage system is installed or drives are added, you can collectively format the volumes.

For details on parity groups, see the Provisioning Guide, or the Provisioning Guide for Open Systems.