AMCC 3WARE 9590SE Betriebsanweisung PDF herunterladen (Seite 25)

Understanding RAID Levels and Concepts

www.3ware.com 19

Through drive coercion, the capacity used for each drive is rounded down so

that drives from differing manufacturers are more likely to be able to be used

as spares for each other. The capacity used for each drive is rounded down to

the nearest GB for drives under 45 GB (45,000,000,000 bytes), and rounded

down to the nearest 5 GB for drives over 45 GB. For example, a 44.3 GB

drive will be rounded down to 44 GB, and a 123 GB drive will be rounded

down to 120 GB. For more information, see the discussion of drive coercion

under “Creating a Hot Spare” on page 97.

Support for Over 2 Terabytes

Windows XP (32-bit), Windows 2003 (32-bit and 64-bit without SP1) 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 when you configure your units.

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 GB to 2048 GB (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.

For more information, see “Using Auto-Carving for Multi LUN Support” on

page 78.

You may also want to refer to Knowledgease article # 13431, at

http://www.3ware.com/kb/article.aspx?id=13431.

Note: All drives in a unit must be of the same type, either SAS or SATA.

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AMCC 3WARE 9590SE Betriebsanweisung Seite 25