Overview : MegaCLI Overview : Command Line Abbreviations and Conventions

Command Line Abbreviations and Conventions

The following table lists the abbreviations for the Nytro cache drive parameters used in the following sections.

Table 1. Command Line Abbreviations

Abbreviation

Description

WB

Write Back write policy

WT

Write Through write policy

RA

Read Ahead read policy

NORA

Normal Read policy (No read ahead)

DIO

Direct I/O cache policy

CIO

Cached I/O cache policy

Conventions

You can specify multiple values for some options. You can enter commands for a single controller (–aN), multiple controllers (‑a0,1,2) or work on all present controllers (-aALL). The options are denoted as –aN|-a0,1,2|-aALL in this document and specify that you can enter commands for one controller, multiple controllers, or all controllers.

*NOTE  All options in the MegaRAID Command Tool are position-dependent, unless otherwise specified.

The following table describes the conventions used in the options.

Table 2. Conventions

Convention

Description

|

Specifies “or,” meaning you can choose between options.

-aN

N specifies the controller number for the command.

-a0,1,2

Specifies the command is for controllers 0, 1, and 2. You can select two or more controllers in this manner.

-aALL

Specifies the command is for all controllers.

-Lx

x specifies the virtual drive number for the command.

-L0,1,2

Specifies the command is for virtual drives 0, 1, and 2. You can select two or more virtual drives in this manner.

-Lall

Specifies the command is for all virtual drives.

[E0:S0,E1,S1,…]

Specifies when one or more physical devices need to be specified in the command line. Each [E:S] pair specifies one physical device, where E means the device ID of the enclosure in which a drive resides, and S means the slot number of the enclosure.In the case of a physical device directly connected to the SAS port on the controller, with no enclosure involved, the format of [:S] can be used where S means the port number on the controller. For devices attached through the backplane, the firmware provides an enclosure device ID, and MegaCLI expects the user input in the format of [E:S]. In the following sections, only the format, [E:S], is used in the command descriptions, although both formats are valid.

[ ]

Indicates that the parameter is optional except when it is used to specify physical devices. For example, [WT] means the write policy (Write Through) is optional.If you enter WT at the command line, the application will use Write Through write policy for the virtual drive. Otherwise, it uses the default value for the parameter.

{ }

Indicates that the parameters are grouped and that they must be given at the same time.

-Force

Specifies that the MegaCLI utility does not ask you for confirmation before it performs this command. You might lose data using this option with some commands.

Slot

You can specify the -Silent command line option for all possible functions of the MegaCLI Configuration Utility. If you enter this option at the command line, no message displays on the dialog.