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Terminology

Virtual Disk (Vdisk): The Vdisk nomenclature is being replaced by Disk Group. In the Linear Storage and in the Storage

Management Utility (SMU) Version 2 you will still see references to Vdisk; in the Virtual Storage and the SMU Version 3 you

will see Disk Group. Vdisk and Disk Group are essentially the same. Vdisks (Linear Disk Groups) have additional RAID types;

NRAID, RAID 0 and 3 are available only in the CLI, and RAID 50 is available in both the CLI and SMU.

Linear Storage: Linear Storage is the traditional storage that has been used for the four MSA generations. With Linear

Storage, the user specifies which drives make up a RAID Group and all storage is fully allocated.

Virtual Storage: Virtual Storage is an extension of Linear Storage. Data is virtualized not only across a single disk group, as

in the linear implementation, but also across multiple disk groups with different performance capabilities and use cases.

Disk Group: A Disk Group is a collection of disks in a given redundancy mode (RAID 1, 5, 6, or 10 for Virtual Disk Groups and

NRAID and RAID 0, 1, 3, 5, 6, 10 or 50 for linear disk groups). A Disk Group is equivalent to a Vdisk in Linear Storage and

utilizes the same proven fault tolerant technology used by Linear Storage. Disk Group RAID level and size can be created

based on performance and/or capacity requirements. With GL200 or newer firmware multiple Virtual Disk Groups can be

allocated into a Storage Pool for use with the Virtual Storage features; while Linear Disk Groups are also in Storage Pools,

there is a one-to-one correlation between Linear Disk Groups and their associated Storage Pools.

Storage Pools: The GL200 firmware or newer introduces Storage Pools which are comprised of one or more Virtual Disk

Groups or one Linear Disk Group. For Virtual Storage, LUNs are no longer restricted to a single disk group as with Linear

Storage. A volume’s data on a given LUN can now span all disk drives in a pool. When capacity is added to a system, users

will benefit from the performance of all spindles in that pool.

When leveraging Storage Pools, the MSA 1040/2040 supports large, flexible volumes with sizes up to 128TB and facilitates

seamless capacity expansion. As volumes are expanded data automatically reflows to balance capacity utilization on all

drives.

LUN (Logical Unit Number): The MSA 1040/2040 arrays support 512 volumes and up to 512 snapshots in a system. All of

these volumes can be mapped to LUNs. Maximum LUN sizes are up to 128 TB and the LUNs sizes are dependent on the

storage architecture: Linear vs. Virtualized. Thin Provisioning allows the user to create the LUNs independent of the physical

storage.

Thin Provisioning: Thin Provisioning allows storage allocation of physical storage resources only when they are consumed

by an application. Thin Provisioning also allows over-provisioning of physical storage pool resources allowing ease of

growth for volumes without predicting storage capacity upfront.

Thick Provisioning: All storage is fully allocated with Thick Provisioning. Linear Storage always uses Thick Provisioning.

Tiers: Disk tiers are comprised of aggregating 1 or more Disk Groups of similar physical disks. The MSA 2040 supports 3

distinct tiers:

1. A Performance tier with SSDs

2. A Standard SAS tier with Enterprise SAS HDDs

3. An Archive tier utilizing Midline SAS HDDs

Prior to GL200 firmware, the MSA 2040 operated through manual tiering, where LUN level tiers are manually created and

managed by using dedicated Vdisks and volumes. LUN level tiering requires careful planning such that applications requiring

the highest performance be placed on Vdisks utilizing high performance SSDs. Applications with lower performance

requirements can be placed on Vdisks comprised of Enterprise SAS or Midline SAS HDDs. Beginning with GL200 or newer

firmware, the MSA 2040 now supports Sub-LUN Tiering and automated data movement between tiers.

The MSA 2040 automated tiering engine moves data between available tiers based on the access characteristics of that

data. Frequently accessed data contained in “pages” will migrate to the highest available tier delivering maximum I/O´s to

the application. Similarly, “cold” or infrequently accessed data is moved to lower performance tiers. Data is migrated

between tiers automatically such that I/O’s are optimized in real-time.

The Archive and Standard Tiers are provided at no charge on the MSA 2040 platform beginning with GL200 or newer

firmware. The Performance Tier utilizing a fault tolerant SSD Disk Group is a paid feature that requires a license. Without the

Performance Tier license installed, SSDs can still be used as Read Cache with the Sub-LUN Tiering feature. Sub-LUN Tiering

from SAS MDL (Archive Tier) to Enterprise SAS (Standard Tier) drives is provided at no charge.

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Mpio HD 200 Guide d'installation Page 5

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