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Altos R360 F2 FAQ (Frequently Asked Questions)
21. SAS RAID (MegaRAID 9240-8i/9260-8i/9271-8i)
1.
What RAID features can MegaRAID support?
ANSWER:
ANSWER:
ANSWER:
ANSWER: Please refer to the table below.
Features
Features
Features
Features
MegaRAID
MegaRAID
MegaRAID
MegaRAID
9240
9240
9240
9240----4
4
4
4iiii
MegaRAID
MegaRAID
MegaRAID
MegaRAID
9260
9260
9260
9260----8
8
8
8iiii
MegaRAID
MegaRAID
MegaRAID
MegaRAID
9271
9271
9271
9271----8
8
8
8iiii
NOTE
NOTE
NOTE
NOTE
SAS BP LED Control (through
SGPIO)
Yes
Yes
Yes
Hardware RAID
Yes
Yes
Yes
Cache Memory of RAID
N/A
512 MB
512 MB
BBU (Battery Backup Unit)
N/A
Yes
Yes
Connector
Mini SAS 4i
connector
(SFF-8087)
Mini SAS 4i
connector
(SFF-8087)
Mini SAS 4i
connector
(SFF-8087)
Global Hot Spare
Yes
Yes
Yes
Dedicated Hot Spare
Yes
Yes
Yes
Audible Alarm
No
Yes
Yes
RAID Volume Support > 2 TB
Yes
Yes
Yes
1
Background Initialization
Yes
Yes
Yes
2
Disk Coercion
Yes
Yes
Yes
3
NCQ (Native Command
Queuing)
Yes
Yes
Yes
4
UEFI/EFI Support
Yes
Yes
Yes
NOTE 1. Not every OS can support disk space up to 2 TB.
NOTE 2. When RAID volume is created, it can be initialized on the background. RAID volume can be
immediately available without completing the fully initialization.
NOTE 3. Drive coercion refers to the ability of the RAID controller to recognize the size of the physical drives
that are connected and then force the larger drives to use only the amount of space available on the smallest
drive. Drive coercion as implemented in these RAID controllers also allows an option to map out a reserved
space to compensate for slightly smaller drive sizes that may be added later. This option allows 128 MB, and 1
GB of drive capacity to remain unused.
The coercion algorithm options are:
Options
Options
Options
Options
Descripti
Descripti
Descripti
Description
on
on
on
Note
Note
Note
Note
None
The software does not coerce the drive capacity.
Default
128MB-way
The software rounds the drive capacity down to
the next 128MB boundary. Then, the software
rounds the drive capacity to the nearest 10MB
boundary. If the resulting capacity is larger than
the real drive size, the coerced capacity is rounded
down to the next 10MB boundary.