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IBM Power System E850C: Technical Overview and Introduction
2.10.2 RAID protection for internal disks
There are multiple protection options for HDD/SSD drives in the Power E850C server,
whether they are contained in the internal SFF or 1.8-inch bays in the system unit or in
disk-only I/O drawers like the EXP24S. Although protecting drives is always recommended,
AIX and Linux users can choose to leave a few or all drives unprotected at their own risk. IBM
supports these configurations.
HDD/SSD drive protection can be provided by AIX and Linux, or by the available hardware
controllers.
All three of these controller options can offer different drive protection options: RAID 0,
RAID 5, RAID 6, or RAID 10. RAID 5 requires a minimum of three drives of the same
capacity. RAID 6 requires a minimum of four drives of the same capacity. RAID 10 requires a
minimum of two drives. Hot spare capability is supported by RAID 5 or RAID 6.
All three controller options offer Easy Tier functionality, which is also called
RAID 5T2
(2-tiered RAID 5),
RAID 6T2
(2-tiered RAID 6), and
RAID 10T2
(2-tiered RAID 10). The split
disk backplane option supports RAID 10T2, but does not support RAID 5T2 or 6T2.
Table 2-25 details the drive protection options that are available with each storage controller
option available with the Power E850C server.
Table 2-25 Drive protection capabilities of the Power E850C storage controller options
Protection type
Dual controller with
write cache (#EPVN)
Dual controller without
write cache (#EPVP)
Split disk backplane
(#EPVQ)
JBOD
No
No
Yes
RAID 0/1
Yes
Yes
Yes
RAID 5/6/10
Yes
Yes
Yes
RAID 5T2 (Easy Tier)
Yes
Yes
No
RAID 6T2 (Easy Tier)
Yes
Yes
No
RAID 10T2 (Easy Tier)
Yes
Yes
Yes
Split backplane
No
No
Yes
Summary of Contents for E850C
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