Brocade Communications Systems StorageWorks 4400 - Enterprise Virtual Array Manual de usuario descargar pdf (Pagina 7)

Figure 2. Zoning example

SAN switch settings for Continuous Access

We used the following fabric Brocade Switch settings, which are based on rules detailed in the SAN design

guide and the HP StorageWorks HP StorageWorks Continuous Access EVA Implementation Guide.

 aptpolicy 1 to set port-based routing policy

 iodset to guarantee in-order delivery

 dlsreset to disable dynamic path selection

Configure EVAs at source and destination sites

Planning EVA disk groups

Planning the necessary disk groups to meet your I/O requirements should be done when configuring the

array. See the HP StorageWorks Enterprise Virtual Array configuration best practices white paper for

recommendations on configuring the array properly.

Determining the number of disks in a disk group

Performance and capacity are the most important factors when designing a storage solution, because they

drive the number of physical disks required for the solution. Performance is a function of how quickly a

transaction can be completed by the storage system. For transactional applications like MS Exchange 2007

or SQL server, which typically generate small block random IOPs, a goal of 20 ms is used for database

reads and writes, while 10 ms is used for log writes. See the HP Best practices for deploying an Exchange

2007 environment using VMware ESX 3.5 white paper for recommendations on configuring Microsoft

Exchange 2007 and the EVA array properly.

Determining how many spindles are required for random access performance begins with understanding

the following workload characteristics.

 The total IOPs required by the applications

 The Read/Write ratios (for example, 1:1 for Exchange 2007 and about 2:1 for a generic OLTP

application on SQL Server 2008)

These characteristics must then be matched with the raw performance of the physical disks that are being

used (for example, 170 IOPS per 15 K RPM disk or 125 IOPS per 10 K RPM disk with small block random

workloads) and the desired RAID protection.

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Brocade Communications Systems StorageWorks 4400 - Enterprise Virtual Array Manual de usuario Pagina 7