AMCC 3ware 9000 Series, Руководство пользователя

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Creating a Hot Spare
www.3ware.com 93
Note: 3ware’s 9000 series RAID controllers use drive coercion so
that drives from differing manufacturers and with slightly different
capacities are more likely to be able to be used as spares for each
other. Drive coercion slightly decreases the usable capacity of a
drive that is used in redundant units.
The capacity used for each drive is rounded down to the nearest
GB for drives under 45 GB (45,000,000,000), and rounded down to
the nearest 5 GBytes for drives over 45 GB. For example, a 44.3
GB drive will be rounded down to 44 GBytes, and a 123 GB drives
will be rounded down to 120 GBytes.
If you have 120 GB drives from different manufacturers, chances
are that the capacity varies slightly. For example, one drive might
be 122 GB, and the other 123 GB, even though both are sold and
marketed as “120 GB drives”. 3ware drive coercion uses the same
capacity for both of these drives so that one could replace the other.
Specifying a Hot Spare through 3DM
If you need to add a drive to be used as the hot spare, follow the instructions
under “Adding a Drive through 3DM” on page 110.
To specify a hot spare after the system is booted
1 In the Available Drives section of the Maintenance Page, select the drive
by checking the box next to it.
2 Click Create Unit .
3 In the dialog box that appears, select the configuration type Spare .
4 Click Ok .
You will see the spare appear at the top of the page, under Unit
Maintenance .