VMware VIEW COMPOSER 2.5 - ARCHITECTURE Instrukcja Użytkownika Pobierz pdf (Strona 19)

EMC Infrastructure for Virtual Desktops Enabled by EMC VNX Series,

VMware vSphere 4.1, VMware View 4.5, and VMware View Composer 2.5 Proven Solution Guide

Storage layout

overview

The following storage configuration was used in the solution:

• SAS disks (0_0 to 0_4) are used for the VNX OE.

• Disks 0_5, 0_10, and 1_14 are hot spares.

• EFDs (0_6_ and 0_7) on the RAID 1/0 group are used to store the linked clone

replicas.

• EFDs (0_8 and 0_9) are used for EMC VNX FAST Cache. There are no

user-configurable LUNs on these drives.

• SAS disks (2_0 to 2_14) and near-line SAS disks (1_0 to 1_4) on the RAID 5 pool

are used to store linked clones. The storage pool uses FAST with SAS and near-

line SAS disks to optimize both performance and capacity across the pool. FAST

Cache is enabled for the entire pool. Four LUNs of 750 GB each are created from

the pool and presented to the ESX servers.

• Near-line SAS disks (1_5 to 1_13) on the RAID 5 (8+1) group are used to store

user data and roaming profiles. Two file systems are created on two LUNs, one for

profiles and the other for user data.

• SAS disks (0_11 to 0_14) are unbound. They are not used for validation tests.

Please note that this reference architecture has been developed using RAID 5 in

order to maximize performance. Customers, specifically those using 1 TB or larger

drives, whose goal is maximum availability during drive rebuilds (should that occur in

their environment) should choose RAID 6, because of the benefit of the additional

parity drive.

EMC VNX FAST

Cache

VNX FAST Cache, a part of the VNX FAST suite, enables EFDs to be used as an

expanded cache layer for the array. The VNX5300 is configured with two 100 GB

EFDs in a RAID 1 configuration for a 93 GB read/write capable cache. This is the

minimum amount of FAST Cache. Larger configurations are supported for scaling

beyond 500 desktops.

FAST Cache has array-wide features available for both file and block storage. FAST

Cache works by examining 64 KB chunks of data in FAST Cache enabled objects on

the array. Frequently accessed data is copied to the FAST Cache and subsequent

accesses to that data chunk are serviced by FAST Cache. This allows immediate

promotion of very active data to the EFDs. This dramatically improves the response

time for very active data and reduces the data hot spots that can occur within the

LUN.

FAST Cache is an extended read/write cache that can absorb read-heavy activities

such as boot storms and antivirus scans, and write-heavy workloads such as

operating system patches and application updates.

EMC VNX FAST

FAST is a pool-based feature available for VNX for block LUNs that migrates data to

different storage tiers based on the performance requirements of the data.

The pool1_x LUNs are built on a storage pool configured on RAID 5 with a mix of

SAS and near-line SAS drives. Initially, the linked clones are placed on the SAS tier.

The data created by the linked clones that is not frequently accessed is automatically

migrated to the near-line SAS storage tier. This releases space in the faster SAS tier

for more active data.

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