Specifications

5102ch01.fm Draft Document for Review May 12, 2014 12:46 pm
10 IBM Power System S822 Technical Overview and Introduction
1.6.1 EXP24S SFF Gen2-bay drawer
If you need more disks than are available with the internal disk bays, you can attach additional
external disk subsystems such as the EXP24S SAS HDD/SSD expansion drawer (#5887).
The EXP24S SFF Gen2-bay drawer is an expansion drawer supporting up to 24 2.5-inch
hot-swap SFF SAS HDDs on IBM POWER6®, IBM POWER6+™, POWER7®, POWER7+™,
or POWER8 servers in 2U of 19-inch rack space. The EXP24S bays are controlled by SAS
adapters or controllers attached to the I/O drawer by SAS X or Y cables.
The EXP24S drawer is attached to SAS ports on either a PCIe SAS adapter located in the
server or to the SAS ports on the rear of the server. Two SAS ports on the rear of the server
are enabled with the expanded-function storage backplane with dual IOA support (#EJ0U).
A maximum of 14 EXP24S drawers are supported on the Power S822.
The SFF bays of the EXP24S differ from the SFF bays of the POWER8 system units. The
EXP24S uses Gen2 or SFF-2 SAS drives that physically do not fit in the SFF-3 bays of the
POWER8 system unit.
The EXP24S includes redundant AC power supplies and two power cords.
Figure 1-3 shows EXP24S SFF drawer.
Figure 1-3 EXP24S SFF drawer
1.7 Server and virtualization management
If you want to implement logical partitions, a Hardware Management Console (HMC) or the
Integrated Virtualization Manager (IVM) is required to manage the Power S822 server. In
general, multiple IBM POWER6, POWER6+, POWER7, POWER7+, and POWER8
processor-based servers can be supported by a single HMC.
If an HMC is used to manage the Power S822, the HMC must be a rack-mount CR5 or later,
or deskside C08 or later.
In April 2014, IBM announced a new HMC model, machine type 7042-CR8. Hardware
features on the CR8 model include a second disk drive (#1998) for RAID 1 data mirroring,
and the option of a redundant power supply. If you prefer not to have RAID 1 enabled on the
HMC, you can override it in the ordering system and remove the additional hard disk drive
Remember: If you do not use an HMC or IVM, the Power S822 runs in full system partition
mode. That means that a single partition owns all the server resources, and only one
operating system can be installed.