HP VMA-series Memory Arrays Uživatelský manuál stáhnout pdf (Strana 20)

20 AM456-9007B Rev 02 HP VMA SAN Gateway Installation and User Guide

any number of flashlets. There is no need for flashlets to be contiguous and

hence LUNs can be packed very well with no wasted space.

• Full-Speed LUNs: Each flashlet and hence each LUN is striped across all of

the VIMMs in a flash VMA Array. By doing this, the performance of the

LUN is only limited by the performance of the whole VMA Array.

• Shared LUNs: Each LUN can be accessed using Fibre Channel and can be

shared by many servers in a cluster.

• Scale-out Clustering: vSHARE leverages the rich clustering capabilities of

vCLUSTER to provide a single web, SNMP, e-mail and XML provisioning

and management API on a system that can scale to 2.5PB, 16,000 LUNs and

10M IOPS. Flash VMA Arrays can be added dynamically without

interruption of existing LUNs and users.

• Active-Active High Availability (HA) configuration: vSHARE provides the

ability to have dual redundant HP VMA SAN Gateways servicing I/O

requests for attached VMA Arrays. For best performance, the configuration

requires that client initiators use multipath I/O (MPIO) software with a round-

robin scheduling algorithm.

LUNs are accessible in an active-active configuration via either HP VMA SAN

Gateway in an HA pair. Clients using MPIO can continue I/O through either

HP VMA SAN Gateway as long as at least one path is still available.

vCLUSTER Architecture

A typical HP VMA SAN Gateway cluster consists of one or more HP VMA SAN

Gateways (nodes), one of which is designated as the master node, another is

designated as the standby node, and additional nodes are designated as “normal”

nodes.

The HP VMA SAN Gateways provide connectivity to the network and allow

multiple servers to share the high performance flash VMA Arrays. Depending on

the configuration, HP VMA SAN Gateways may be used for block or file storage.

The VMA Arrays provide high capacity flash storage with RAID protection.

In an HP VMA SAN Gateway cluster the first HP VMA SAN Gateway added to

the cluster is designated as the Master HP VMA SAN Gateway (master node).

Configurations defined in the master node are inherited by every other node in the

cluster. Should the master node fail, the standby node takes over the master role,

and cluster management traffic is automatically redirected to the new master node.

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