Specifications

Chapter 2. Architecture and technical overview 51
Draft Document for Review May 12, 2014 12:46 pm 5102ch02.fm
Other applications like Big Data can take advantage of this approach on compression once
the compressions rates are higher than the ones achieved via software and the compression
processes complete in a shorter time allowing for more data density, disk savings and faster
data analysis.
2.6 Internal storage
The internal storage on the Power S822 server depends on the DASD/Media backplane
used. The server supports two DASD/Media backplanes: #EJ0T and #EJ0U.
The #EJ0T storage backplane contains:
򐂰 A storage backplane for twelve 2.5-inch SFF Gen3 HDDs or SSDs.
򐂰 One SAS disk controller capable of RAID 0, RAID 5, RAID 6, and RAID 10, placed in a
dedicated SAS controller slot (P1-C14).
򐂰 The optional split backplane feature #EJ0V adds a secondary SAS disk controller and
allows DASDs to be split into two groups of six (6+6). This secondary controller is placed
in the second dedicated SAS controller slot (P1-C15).
The #EJ0U storage backplane contains:
򐂰 A storage backplane for eight 2.5-inch SFF Gen3 HDDs or SSDs.
򐂰 Two active-active SAS disk controllers capable of RAID 0, RAID 5, RAID 6, RAID 10, RAID
5T2, RAID 6T2 & RAID 10T2, placed in dedicated SAS controller slots P1-C14 and
P1-C15.
򐂰 The #EJTL SSD Module Cage, automatically added by e-config when #EJ0U is ordered,
adds a secondary disk cage with six 1.8” SSD module bays.
򐂰 Two external SAS ports for DASD drawers connectivity (via slot P1-C9) supporting one
EXP24S SFF Gen2-bay Drawer (#5887).
򐂰 The storage split backplane function is not supported.
Table 2-18 presents a summarized view of the above features.
Table 2-18 Backplane options and summary of features
#EJ0T backplane #EJ0U backplane
Supported RAID types JBOD, RAID 0, RAID 5, RAID 6,
RAID 10
JBOD, RAID 0, RAID 5, RAID 6,
RAID 10, RAID 5T2, RAID 6T2
Disk bays 12 SFF Gen3 (HDDs/SSDs) 8 SFF Gen3 (HDDs/SSDs)
SAS controllers Single Dual active-active
Easy Tier capable controllers No Yes
External SAS ports No Yes, two SAS ports
Split backplane Optional (#EJ0V) includes
secondary SAS controller
No
SSD 1.8” module cage No Optional (#EJTL)
PCIe slot P1-C9 Available for PCIe x8 cards Used by external SAS ports