Sas Raid (Megaraid 9260-16I/9280-16I4E) - Acer Altos R360 F2 Frequently Asked Questions Manual

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: Please refer to the table below. ANSWER:
ANSWER: ANSWER:
Features Features Features Features
SAS BP LED Control (through
SGPIO)
Hardware RAID
Cache Memory of RAID
BBU (Battery Backup Unit)
Connector
Global Hot Spare
Dedicated Hot Spare
Audible Alarm
RAID Volume Support > 2 TB
Background Initialization
Disk Coercion
NCQ (Native Command
Queuing)
UEFI/EFI Support
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
None
128MB-way
MegaRAID MegaRAID MegaRAID MegaRAID
9240- - - - 4 4 4 4 i i i i 9240 9240 9240
Yes
Yes
N/A
N/A
Mini SAS 4i
connector
(SFF-8087)
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Description Descripti
Descripti Descripti
The software does not coerce the drive capacity.
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.
MegaRAID MegaRAID MegaRAID MegaRAID MegaRAID MegaRAID MegaRAID MegaRAID
9260 9260 9260- - - - 8 8 8 8 i i i i 9260 9271- - - - 8 8 8 8 i i i i 9271 9271 9271
Yes Yes
Yes Yes
512 MB 512 MB
Yes Yes
Mini SAS 4i Mini SAS 4i
connector connector
(SFF-8087) (SFF-8087)
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
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