Hot Fix (Spare) Disks; Example Of A 9Gb Pooled Hot Fix Drive Selected To Protect Four Raid Array Drives - Intel SRCS14L - RAID Controller User Manual

Intel® Integrated RAID Controller SRCS14L
Table 13. Supported Cache Settings
12 Write
Legend
4.3.3

Hot Fix (Spare) Disks

There are two types of hot fix drives:
•
Private (dedicated): This type of hot fix drive is assigned to a specific RAID 4, 5, or 10 array
drive. It cannot be used by any other RAID array drive configured on the controller.
•
Pooled (global): This type of hot fix drive is available for any RAID 1, 4, 5, or 10 array drive
that has been configured with Pooled Hot Fix Access enabled.
When adding a Pool Hot Fix to a specific array, the access for this array will be automatically
enabled, for other arrays this feature has to be manually activated with the Pool Hot Fix
Access switch.
The capacities of Hot fix drives are required to be the same size or larger than the capacity of the
smallest physical disk drive in the RAID array drives that they are protecting. Therefore, if you
have two RAID arrays where Array_1 has all 9 GB drives and Array_2 has all 18 GB drives then
Array_1 would require, at a minimum, a 9 GB hot fix drive and Array_2 would require, at a
minimum, an 18 GB hot fix drive.
Also, when using a single pooled hot fix drive to protect several RAID array drives, the pooled hot
fix drive must meet the proper capacity requirement to protect all of the arrays. To select the proper
sized pooled hot fix drive, first determine the capacity of the smallest physical disk drive in each
RAID array to be protected. Next, select a pooled hot fix drive that is equal to or larger than the
capacity of the largest of these disk drives. For example, in
for the four RAID arrays is 9GB, then it would only protect arrays 1 and 2. Therefore, the proper
hot fix drive selection to protect all four of the array drives would have to be of a minimum
capacity of 36GB (see note below).
Table 14. Example of a 9GB Pooled Hot Fix Drive
Selected to Protect Four Raid Array Drives
Array (smallest disk)
Protected by Pooled Hot Fix?
Note: This is only an example of how the pooled hot fix drive feature works. Obviously it would not
be practical to use only one pooled hot fix drive to protect all four of the arrays in this example un-
less hardware configuration limitation only allowed for one extra drive as a pooled hot fix (i.e. add-
ing the pooled hot fix drive brings the total number of hard disk drives to the maximum supported
by the controller).
24
Cache Setting
Disk Cache
• Read • Cache
_ diabled/off
• enabled/on
•_ either
Array_1 (4GB)
Controller Cache
Delayed
• • Disk Read Write, Controller Read Write
Write
Table
Array_2 (9GB)
Yes Yes
Cache Configuration
Description
14, if the pooled hot fix drive
Array_3 (18GB) Array_4 (36GB)
No No
Technical Product Specification