Adaptec 2940U - AHA Storage Controller Ultra SCSI 20 MBps Información técnica descargar pdf (Pagina 152)

138 MetaFrame Solutions Guide

All configured connections, whether active or inactive, consume system

memory. To avoid allocating memory for connections that will never be used, be

sure to configure only the type and number of connections required for your

configuration.

Hard Disks

Citrix does not recommend installing MetaFrame on a RAID drive or using a

RAID drive for the MetaFrame swap file. RAID drives have additional overhead

that enhances data reliability but can adversely affect operating system

performance.

The factors related to hard disks that can affect performance on a MetaFrame

server include:

Percentage of disk time

Disk queue length

Percentage of Disk Time

The %Disk Time counter measures the percentage of time that a hard drive is

active. If the %Disk Time counter value is high, the hard disk is not adequate for

the system. Take one or more of the following steps:

1. Use a 32-bit PCI bus mastering SCSI controller or a higher-performance (for

example, Wide SCSI or Fast Wide SCSI) subsystem in the MetaFrame server.

This speeds up data transfer to and from the drive.

2. Spread the pagefile across multiple drives.

3. Install a separate hard drive and assign only the pagefile to the drive.

4. Install a separate SCSI controller and hard drive and assign only the pagefile to

that drive and controller.

5. Offload some of the more frequently accessed data to a less utilized server.

6. Install another server to help handle the user load.

Disk Queue Length

Another item to monitor is the Disk Queue Length counter. This measures the

number of I/O requests outstanding for the hard drive. If data has to wait in a long

queue before it is written or read from the disk, it can affect the MetaFrame server

performance. The Disk Queue Length values should be sustained at no more than

1.5 to 2 times the number of spindles making up the physical disk. Most disks

have only one spindle. RAID disks usually have more but appear as only one

physical disk to Performance Monitor.

Note

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Adaptec 2940U - AHA Storage Controller Ultra SCSI 20 MBps Información técnica Pagina 152