System information

69
Altos R380 F2 FAQ (Frequently Asked Questions)
22. SAS RAID (Integrated RAID Module RMS25CB040/RMS25CB080)
1. What RAID features can the integrated RAID Module RMS25CB040/RMS25CB080 support?
ANSWER:
ANSWER: ANSWER:
ANSWER: Please refer to the table below.
Features
FeaturesFeatures
Features RMS25CB040
RMS25CB040RMS25CB040
RMS25CB040 RMS25CB080
RMS25CB080RMS25CB080
RMS25CB080 NOTE
NOTENOTE
NOTE
SAS BP LED Control (through
SGPIO)
Yes Yes
Hardware RAID Yes Yes
Cache Memory of RAID 1 GB 1 GB
BBU (Battery Backup Unit) Yes Yes
Connector
Mini SAS 4i
(SFF-8087)
Mini SAS 4i
(SFF-8087)
Global Hot Spare Yes Yes
Dedicated Hot Spare Yes Yes
Audible Alarm Yes Yes
RAID Volume Support > 2 TB Yes Yes 1
Background Initialization Yes Yes 2
Disk Coercion Yes Yes 3
NCQ (Native Command
Queuing)
Yes Yes 4
UEFI/EFI Support 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
OptionsOptions
Options Description
DescriptionDescription
Description Note
NoteNote
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.