Installation guide

Understanding RAID Levels and Concepts
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Outputting the CLI to a Text File
You can send the output of the 3ware CLI, including errors, to a text file by
adding 2>&1 to the end of the line. Outputting to a text file can be useful, for
example, if you want to email the output to LSI Technical Support.
Examples
tw_cli /c2/p0 show >> controller2port0info.txt 2>&1
or
tw_cli /c0 show diag >> Logfile.txt 2>&1
Conventions
The following conventions are used throughout this guide:
• In text,
monospace font is used for code and for things you type.
• In descriptions and explanations of commands, a bold font indicates the
name of commands and parameters, for example, /c0/p0 show all.
• In commands, an italic font indicates items that are variable, but that you
must specify, such as a controller ID, or a unit ID, for example,
/c0/p0
show
attribute, and /cx/px show all
• In commands, brackets around an item indicate that it is optional.
• In commands, ellipses (...) indicate that more than one parameter at a time
can be included, for example, /c0/p0 show attribute [attribute ...]
• In commands, two dots (..) indicate that there is a range between two
values from which you can pick a value, for example, /cx set
carvesize=[1024..2048].
• In commands, a vertical bar (|) indicates an or situation where you have a
choice between more than one attribute, but only one can be specified.
Example: In the command to rescan all ports and reconstitute all units, the
syntax appears as /cx rescan [noscan]. The brackets [ ] indicate that you can
omit the noscan parameter so that the operation will be reported to the
operating system.
Understanding RAID Levels and Concepts
3ware RAID controllers use RAID (Redundant Array of Independent Disks)
to increase your storage system’s performance and provide fault tolerance
(protection against data loss).
This section includes the following RAID-specific topics:
• “RAID Concepts”