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Chapter 1. Introduction to the 3ware Command Line Interface
16
3ware 9000 Series Serial ATA Controller CLI Guide
Support for Over 2 Terabytes
Windows 2000, Windows XP, and Linux 2.4 do not currently recognize unit
capacity in excess of 2 TB.
If the combined capacity of the drives to be connected to a unit exceeds 2
Terabytes (TB), you can enable auto-carving using the
set autocarve
command.
Auto-carving divides the available unit capacity into multiple chunks of 2 TB
or smaller that can be addressed by the operating systems as separate
volumes.The carve size is adjustable from 1024 MB to 2048 MB (default)
prior to unit creation.
If a unit over 2 TB was created prior to enabling the auto-carve option, its
capacity visible to the operating system will still be 2TB; no additional
capacity will be registered. To change this, the unit has to be recreated.
StorSave Profiles
You can set the desired level of data protection versus performance for a unit
by specifying the StorSave Profile to be used. Three profiles are provided:
Protection
(maximum data protection),
Performance
(maximum
performance, less data protection), and
Balanced
(a middle ground).The
default is Protection.
For details about how to select a StorSave Profile for a unit, see “/cx/ux set
storsave=protect|balance|perform [quiet]” on page 62.
Note:
If the write cache setting is disabled for a unit, the StorSave Profile
capability does not apply and is automatically disabled.
The three profiles automatically adjust several different factors that affect
protection and performance on a per unit basis. These are summarized in the
table below and further explained after the table.
Table 4: StorSave Profile Definitions
Protection (Default)
Balanced
Performance
Definition
Maximum data
protection, but slower
performance.
More data protection
than
Performance
but
less data protection
than
Protection
.
Maximum
performance for the
unit, but less data
protection.
FUA (Force Unit
Access)
Honor FUA (If no BBU
is present)
Ignore FUA (If BBU is
present)
Honor FUA (If no BBU
is present)
Ignore FUA (If BBU is
present)
Ignore FUA