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Administrator Guide 15

OceanStor 5300 V3, 5500 V3, 5600 V3, 5800 V3, and 6800 V3 Storage System V300R003

Routine maintenance activities are the most common activities for the storage device, including powering on or off the storage device, managing users, modifying basic parameters of the storage device, and managing hardware components. This document applies to the system administrators who are responsible for carrying out routine maintenance activities, monitoring the storage device, and rectifying common device faults.
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Introduction to Storage Space

Introduction to Storage Space

When setting up a storage environment for new services running on application servers, you need to allocate storage space to the application servers. Before that, understand related concepts and the operation procedure to ensure that the process goes smoothly.

Basic Storage Concepts

Huawei RAID 2.0+ technology, employed by the OceanStor 5300 V3/5500 V3/5600 V3/5800 V3/6800 V3 storage system, divides physical storage space into small data chunks and distributes them evenly onto all disks in a storage pool. Then the chunks comprise LUNs in the logical RAID forms that are required by services. Then the LUNs are available to application servers. The RAID 2.0+ technology has the following advantages:

  • Automatic load balancing: No hotspot disk exists because the load is balanced among all disks. This improves concurrent read/write performance of the storage system and disk reliability.
  • Fast reconstruction: If an area of the disk domain is faulty, all the other areas participate in the reconstruction of the data in the faulty area, greatly accelerating the reconstruction.
  • Improved storage performance: A large number of physical disks are in place to provide LUN space. During each capacity expansion process, the LUN space is automatically redistributed to balance loads and maximize space utilization.

Table 4-1 describes concepts related to storage space.

Table 4-1  Basic storage concepts

Concept

Description

Disk domain

Consists of a series of disks. The disks are of different types and logically combined in a disk domain to provide one or more storage pools with storage space. Disk data is automatically load balanced within a disk domain to deliver optimal performance.

Storage pool

A logical container for storage space. Storage pools are created in a disk domain according to specified different RAID levels. In a storage pool, all LUN data is automatically migrated depending on the data access frequency, enabling the storage pool to perform optimally.

Storage layer

Storage space comprising the same type of disks that adopt the same RAID policy in a storage pool. Each storage layer has its own advantage. Data can be automatically or manually migrated among the layers based on system data access statistics.

Hot spare space

Reserved space in a disk domain for reconstructing data of faulty disks.

LUN and LUN group

A LUN, using storage space from a storage pool, is the smallest logical storage unit that application servers can identify. LUNs can be added to a mapping view only after they join a LUN group. Only LUNs in a mapping view can establish logical relationships with application servers. A LUN group can have one or multiple LUNs.

Host and host group

A host logically represents an application server in the storage system. A host group can have one or multiple hosts, and a host can belong to one or multiple host groups. Hosts can be added to a mapping view only after they join a host group. A host represents the application server that uses it.

Port group

Logically consists of Fibre Channel and Ethernet ports that connect the storage system to application servers. A port group can provide data storage services for a host group.

Mapping view

A view that reflects the access restrictions and mapping between a LUN group, a port group, and a host group. Within the mapping view, a host group can access the port group or LUN group. All members of a host group, port group, and LUN group in the same mapping view are mapped to each other. One mapping view can house only one host group, one LUN group, and one port group (optional).

Figure 4-1 shows how application servers use the storage space of the storage system.

Figure 4-1  How application servers use storage space

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Updated: 2019-04-17

Document ID: EDOC1000084191

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