LSI 3ware SAS 9750-8i Uživatelská příručka stáhnout pdf (Strana 117)

Creating a Hot Spare

www.lsi.com/channel/products 105

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” on page 135.

To specify a hot spare after the system is booted

1 In 3DM 2, choose

Management > Maintenance.

2 In the Available Drives list, select the drive you want as a hot spare by

marking the checkbox in front of its Port number.

3 Click

Set Spares.

You will see the status change to

OK-SPARE.

Specifying a Hot Spare through 3BM

1 On the main 3BM screen, in the list of Available Drives, highlight the

drive you want to use.

2Type s to specify that the selected drive will be the hot spare.

You’ll see the words “Hot Spare” appear next to the drive in the Available

Drives list.

Note: 3ware’s 9750 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 bytes), 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 drive 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.

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LSI 3ware SAS 9750-8i Uživatelská příručka Strana 117

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