LSI 3ware SAS 9750-8i Betriebsanweisung PDF herunterladen (Seite 125)

Setting Unit Policies

www.lsi.com/channel/products 113

When to Use Each Read Cache Setting

The following table provides some recommendations for when to use each

Read Cache setting.

Changing the Read Cache Policy for Existing Units

The Read Cache policy is initially set when you create a unit. You can change

it later from either 3DM 2 or 3BM.

To change the Read Cache unit policy In 3DM 2

1 Choose

Management > Controller Settings fr

om the menu bar in 3DM 2

2In the

Unit Policies section of the Controller Settings page, select the

desired Read Cache setting, as shown in Figure 55.

Intelligent: Enables both the Basic and Intelligent Read Prefetch (IRP)

caching features.

Basic: Enables the Basic read caching mode for the unit.

Disabled: Disables the Read Cache policy for the unit.

Table 8: Recommendations for Using Each Read Cache Setting

Use this Read Cache

Setting

For this reason Example applications

Intelligent Sequential applications,

with a low host command

queue depth

Video on Demand,

Video Surveillance

Playback

Disk-to-Disk Backup

Restores, File Server

Basic Frequent access to

recently written data

Database

Disabled Applications that produce

a high queue depth or

perform their own read-

ahead can generate

enough I/O to negate the

benefits of controller read

caching or read-ahead.

This is especially true for

applications that produce

a lot of random I/O.

Online Transaction

Processing (OLTP)

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LSI 3ware SAS 9750-8i Betriebsanweisung Seite 125

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