Bull Escala Power7 Series User manual

SAS subsystem for the E1-705, E1-715,
E3-705 or E3-715
ESCALA Power7
REFERENCE
86 A1 69FF04

ESCALA Models Reference
The ESCALA Power7 publications concern the following models:
Bull Escala E1-700 / E3-700 (31E/2B ,8231-E2B)
Bull Escala E1-705 (31E/1C, 8231-E1C)
Bull Escala E1-715 (31E/1D, 8231-E1D)
Bull Escala E3-705 (31E/2C, 8231-E2C)
Bull Escala E3-715 (31E/2D, 8231-E2D)
Bull Escala E2-700 / E2-700T (02E/4B, 8202-E4B)
Bull Escala E2-705 / E2-705T (02E/4C, 8202-E4C)
Bull Escala E2-715 / E2-715T (02E/4D, 8202-E4D)
Bull Escala E4-700 / E4-700T (05F/6B, 8205-E6B)
Bull Escala E4-705 (05E/6C, 8205-E6C)
Bull Escala E4-715 (05E/6D, 8205-E6D)
Bull Escala E5-700 (33E/8B, 8233-E8B)
Bull Escala E5-715 (08E/8D, 8408-E8D)
Bull Escala M5-715 (09R/MD, 9109-RMD)
Bull Escala M6-700 (17M/MB, 9117-MMB)
Bull Escala M6-705 (17M/MC, 9117-MMC)
Bull Escala M6-715 (17M/MD, 9117-MMD)
Bull Escala M7-700 (79M/HB, 9179-MHB)
Bull Escala M7-705 (79M/HC, 9179-MHC)
Bull Escala M7-715 (79M/HD, 9179-MHD)
Bull Escala H9-700 (19F/HB, 9119-FHB)
References to 8236-E8C models are irrelevant.
Hardware
February 2013
BULL CEDOC
357 AVENUE PATTON
B.P.20845
49008 ANGERS CEDEX 01
FRANCE

The following copyright notice protects this book under Copyright laws which prohibit such actions as, but not limited to, copying,
distributing, modifying, and making derivative works.
Copyright © Bull SAS 2013
Printed in France
Trademarks and Acknowledgements
We acknowledge the rights of the proprietors of the trademarks mentioned in this manual.
All brand names and software and hardware product names are subject to trademark and/or patent protection.
Quoting of brand and product names is for information purposes only and does not represent trademark misuse.
The information in this document is subject to change without notice. Bull will not be liable for errors contained herein, or
for incidental or consequential damages in connection with the use of this material.

Contents
Safety notices .................................v
SAS subsystem for the 31E/1C, 31E/1D, 31E/2C, or 31E/2D..............1
What's new in SAS subsystem for the 31E/1C, 31E/1D, 31E/2C, or 31E/2D ..............1
SAS architecture ..................................1
31E/1C, 31E/1D, 31E/2C, or 31E/2D SAS subsystem overview .................1
31E/1C, 31E/1D, 31E/2C, or 31E/2D SAS storage configurations..................5
31E/1C, 31E/1D, 31E/2C, or 31E/2D SAS subsystem base configuration ..............6
31E/1C, 31E/1D, 31E/2C, or 31E/2D SAS subsystem configuration with tape storage ..........7
31E/1C, 31E/1D, 31E/2C, or 31E/2D SAS dual-RAID subsystem .................8
31E/1C, 31E/1D, 31E/2C, or 31E/2D SAS subsystem service considerations..............10
Service considerations for the cache battery pack ......................11
Problem determination and recovery ...........................13
Notices ...................................15
Trademarks ...................................16
Electronic emission notices ..............................16
Class A Notices .................................16
Class B Notices .................................20
Terms and conditions ................................22
iii

iv SAS subsystem for the 31E/1C or 31E/2C: SAS subsystem

Safety notices
Safety notices may be printed throughout this guide:
vDANGER notices call attention to a situation that is potentially lethal or extremely hazardous to
people.
vCAUTION notices call attention to a situation that is potentially hazardous to people because of some
existing condition.
vAttention notices call attention to the possibility of damage to a program, device, system, or data.
World Trade safety information
Several countries require the safety information contained in product publications to be presented in their
national languages. If this requirement applies to your country, a safety information booklet is included
in the publications package shipped with the product. The booklet contains the safety information in
your national language with references to the U.S. English source. Before using a U.S. English publication
to install, operate, or service this product, you must first become familiar with the related safety
information in the booklet. You should also refer to the booklet any time you do not clearly understand
any safety information in the U.S. English publications.
German safety information
Das Produkt ist nicht für den Einsatz an Bildschirmarbeitsplätzen im Sinne§2der
Bildschirmarbeitsverordnung geeignet.
Laser safety information
IBM®servers can use I/O cards or features that are fiber-optic based and that utilize lasers or LEDs.
Laser compliance
IBM servers may be installed inside or outside of an IT equipment rack.
v

DANGER
When working on or around the system, observe the following precautions:
Electrical voltage and current from power, telephone, and communication cables are hazardous. To
avoid a shock hazard:
vConnect power to this unit only with the provided power cord. Do not use the provided power
cord for any other product.
vDo not open or service any power supply assembly.
vDo not connect or disconnect any cables or perform installation, maintenance, or reconfiguration
of this product during an electrical storm.
vThe product might be equipped with multiple power cords. To remove all hazardous voltages,
disconnect all power cords.
vConnect all power cords to a properly wired and grounded electrical outlet. Ensure that the outlet
supplies proper voltage and phase rotation according to the system rating plate.
vConnect any equipment that will be attached to this product to properly wired outlets.
vWhen possible, use one hand only to connect or disconnect signal cables.
vNever turn on any equipment when there is evidence of fire, water, or structural damage.
vDisconnect the attached power cords, telecommunications systems, networks, and modems before
you open the device covers, unless instructed otherwise in the installation and configuration
procedures.
vConnect and disconnect cables as described in the following procedures when installing, moving,
or opening covers on this product or attached devices.
To Disconnect:
1. Turn off everything (unless instructed otherwise).
2. Remove the power cords from the outlets.
3. Remove the signal cables from the connectors.
4. Remove all cables from the devices.
To Connect:
1. Turn off everything (unless instructed otherwise).
2. Attach all cables to the devices.
3. Attach the signal cables to the connectors.
4. Attach the power cords to the outlets.
5. Turn on the devices.
(D005a)
DANGER
vi SAS subsystem for the 31E/1C or 31E/2C: SAS subsystem

Observe the following precautions when working on or around your IT rack system:
vHeavy equipment–personal injury or equipment damage might result if mishandled.
vAlways lower the leveling pads on the rack cabinet.
vAlways install stabilizer brackets on the rack cabinet.
vTo avoid hazardous conditions due to uneven mechanical loading, always install the heaviest
devices in the bottom of the rack cabinet. Always install servers and optional devices starting
from the bottom of the rack cabinet.
vRack-mounted devices are not to be used as shelves or work spaces. Do not place objects on top
of rack-mounted devices.
vEach rack cabinet might have more than one power cord. Be sure to disconnect all power cords in
the rack cabinet when directed to disconnect power during servicing.
vConnect all devices installed in a rack cabinet to power devices installed in the same rack
cabinet. Do not plug a power cord from a device installed in one rack cabinet into a power
device installed in a different rack cabinet.
vAn electrical outlet that is not correctly wired could place hazardous voltage on the metal parts of
the system or the devices that attach to the system. It is the responsibility of the customer to
ensure that the outlet is correctly wired and grounded to prevent an electrical shock.
CAUTION
vDo not install a unit in a rack where the internal rack ambient temperatures will exceed the
manufacturer's recommended ambient temperature for all your rack-mounted devices.
vDo not install a unit in a rack where the air flow is compromised. Ensure that air flow is not
blocked or reduced on any side, front, or back of a unit used for air flow through the unit.
vConsideration should be given to the connection of the equipment to the supply circuit so that
overloading of the circuits does not compromise the supply wiring or overcurrent protection. To
provide the correct power connection to a rack, refer to the rating labels located on the
equipment in the rack to determine the total power requirement of the supply circuit.
v(For sliding drawers.) Do not pull out or install any drawer or feature if the rack stabilizer brackets
are not attached to the rack. Do not pull out more than one drawer at a time. The rack might
become unstable if you pull out more than one drawer at a time.
v(For fixed drawers.) This drawer is a fixed drawer and must not be moved for servicing unless
specified by the manufacturer. Attempting to move the drawer partially or completely out of the
rack might cause the rack to become unstable or cause the drawer to fall out of the rack.
(R001)
Safety notices vii

CAUTION:
Removing components from the upper positions in the rack cabinet improves rack stability during
relocation. Follow these general guidelines whenever you relocate a populated rack cabinet within a
room or building:
vReduce the weight of the rack cabinet by removing equipment starting at the top of the rack
cabinet. When possible, restore the rack cabinet to the configuration of the rack cabinet as you
received it. If this configuration is not known, you must observe the following precautions:
– Remove all devices in the 32U position and above.
– Ensure that the heaviest devices are installed in the bottom of the rack cabinet.
– Ensure that there are no empty U-levels between devices installed in the rack cabinet below the
32U level.
vIf the rack cabinet you are relocating is part of a suite of rack cabinets, detach the rack cabinet from
the suite.
vInspect the route that you plan to take to eliminate potential hazards.
vVerify that the route that you choose can support the weight of the loaded rack cabinet. Refer to the
documentation that comes with your rack cabinet for the weight of a loaded rack cabinet.
vVerify that all door openings are at least 760 x 230 mm (30 x 80 in.).
vEnsure that all devices, shelves, drawers, doors, and cables are secure.
vEnsure that the four leveling pads are raised to their highest position.
vEnsure that there is no stabilizer bracket installed on the rack cabinet during movement.
vDo not use a ramp inclined at more than 10 degrees.
vWhen the rack cabinet is in the new location, complete the following steps:
– Lower the four leveling pads.
– Install stabilizer brackets on the rack cabinet.
– If you removed any devices from the rack cabinet, repopulate the rack cabinet from the lowest
position to the highest position.
vIf a long-distance relocation is required, restore the rack cabinet to the configuration of the rack
cabinet as you received it. Pack the rack cabinet in the original packaging material, or equivalent.
Also lower the leveling pads to raise the casters off of the pallet and bolt the rack cabinet to the
pallet.
(R002)
(L001)
(L002)
viii SAS subsystem for the 31E/1C or 31E/2C: SAS subsystem

(L003)
or
All lasers are certified in the U.S. to conform to the requirements of DHHS 21 CFR Subchapter J for class
1 laser products. Outside the U.S., they are certified to be in compliance with IEC 60825 as a class 1 laser
product. Consult the label on each part for laser certification numbers and approval information.
CAUTION:
This product might contain one or more of the following devices: CD-ROM drive, DVD-ROM drive,
DVD-RAM drive, or laser module, which are Class 1 laser products. Note the following information:
vDo not remove the covers. Removing the covers of the laser product could result in exposure to
hazardous laser radiation. There are no serviceable parts inside the device.
vUse of the controls or adjustments or performance of procedures other than those specified herein
might result in hazardous radiation exposure.
(C026)
Safety notices ix

CAUTION:
Data processing environments can contain equipment transmitting on system links with laser modules
that operate at greater than Class 1 power levels. For this reason, never look into the end of an optical
fiber cable or open receptacle. (C027)
CAUTION:
This product contains a Class 1M laser. Do not view directly with optical instruments. (C028)
CAUTION:
Some laser products contain an embedded Class 3A or Class 3B laser diode. Note the following
information: laser radiation when open. Do not stare into the beam, do not view directly with optical
instruments, and avoid direct exposure to the beam. (C030)
CAUTION:
The battery contains lithium. To avoid possible explosion, do not burn or charge the battery.
Do Not:
v___ Throw or immerse into water
v___ Heat to more than 100°C (212°F)
v___ Repair or disassemble
Exchange only with the approved part. Recycle or discard the battery as instructed by local
regulations. (C003a)
Power and cabling information for NEBS (Network Equipment-Building System)
GR-1089-CORE
The following comments apply to the IBM servers that have been designated as conforming to NEBS
(Network Equipment-Building System) GR-1089-CORE:
The equipment is suitable for installation in the following:
vNetwork telecommunications facilities
vLocations where the NEC (National Electrical Code) applies
The intrabuilding ports of this equipment are suitable for connection to intrabuilding or unexposed
wiring or cabling only. The intrabuilding ports of this equipment must not be metallically connected to the
interfaces that connect to the OSP (outside plant) or its wiring. These interfaces are designed for use as
intrabuilding interfaces only (Type 2 or Type 4 ports as described in GR-1089-CORE) and require isolation
from the exposed OSP cabling. The addition of primary protectors is not sufficient protection to connect
these interfaces metallically to OSP wiring.
Note: All Ethernet cables must be shielded and grounded at both ends.
The ac-powered system does not require the use of an external surge protection device (SPD).
The dc-powered system employs an isolated DC return (DC-I) design. The DC battery return terminal
shall not be connected to the chassis or frame ground.
xSAS subsystem for the 31E/1C or 31E/2C: SAS subsystem

SAS subsystem for the 31E/1C, 31E/1D, 31E/2C, or 31E/2D
Review the SAS subsystem features, configurations, and limitations for the 7/10 (31E/1C or 31E/1D) and
the 7/30 (31E/2C or 31E/2D) system.
What's new in SAS subsystem for the 31E/1C, 31E/1D, 31E/2C, or
31E/2D
Read about new or significantly changed information in SAS subsystem for the 31E/1C, 31E/1D, 31E/2C,
or 31E/2D since the previous update of this topic collection.
March 2013
The following updates are made to the content:
vAdded information for the 7/10 (31E/1D) and the 7/30 (31E/2D) servers.
SAS architecture
Serial-attached SCSI (SAS) architecture describes a serial device interconnection and transportation
protocol that defines the rules for information exchange between devices.
SAS is an evolution of the parallel SCSI device interface into a serial point-to-point interface. SAS
physical links are a set of four wires used as two differential signal pairs. One differential signal transmits
in one direction, while the other differential signal transmits in the opposite direction. Data can be
transmitted in both directions simultaneously. Physical links are contained in SAS ports, which contain
one or more physical links. A port is a wide port if there are more than one physical link in the port. If
there is only one physical link in the port, it is a narrow port. A port is identified by a unique SAS
worldwide name (also called SAS address).
ASAS adapter contains one or more SAS ports. A path is a logical point-to-point link between a SAS
initiator port in the adapter and a SAS target port in the I/O device (for example, a disk). A connection is
a temporary association between an adapter and an I/O device through a path. A connection enables
communication to a device. The adapter can communicate to the I/O device over this connection by
using either the SCSI command set or the Advanced Technology Attachment (ATA) and Advanced
technology Attachment Packet Interface (ATAPI) command set depending on the device type.
ASAS expander enables connections between an adapter port and multiple I/O device ports by routing
connections between the expander ports. Only a single connection through an expander can exist at any
given time. Using expanders creates more nodes in the path from the adapter to the I/O device. If an I/O
device supports multiple ports, more than one path to the device can exist when there are expander
devices included in the path.
ASAS fabric refers to the summation of all paths between all SAS adapter ports and all I/O device ports
in the SAS subsystem including cables, enclosures, and expanders.
31E/1C, 31E/1D, 31E/2C, or 31E/2D SAS subsystem overview
Review SAS subsystem features and locations.
Use this information with your specific system unit and operating system documentation. General
information is intended for all users of this product. Service information is intended for a service
representative that is specifically trained on the system unit and subsystem being serviced.
1

Note: All SAS subsystem features for 31E/1C, 31E/1D, 31E/2C, or 31E/2D systems share the same
integrated base system board (custom card identification numbers (CCIN) 2B2C or 2B4A for the
two-socket model and 2B2D or 2B4B for the one-socket model). The physical location code for the base
system board is Un-P1.
Feature locations
Use Figure 1 and Table 1 to review the features and locations of the SAS base subsystem.
Table 1. SAS base subsystem (feature code EJ0D) components
Diagram
location Part name CCINs Physical location codes
A Base backplane12B2C or 2B4A
(two-socket), 2B2D
or 2B4B (one-socket)
Un-P1
B DVD drive1Un-P3-D7
C Base storage interposer 2C1D or 2D1E Un-P2
D Base storage backplane 2BD7 Un-P3
E Disk bays (6 SFF drive disk
bays)
Un-P3-D1 - Un-P3-D6
1This feature is part of the SAS subsystem but separate from feature code EJ0D.
Use Figure 2 on page 3 and Table 2 on page 3 to review the features and locations of the SAS base
subsystem with tape storage.
Figure 1. SAS base subsystem overview
2SAS subsystem for the 31E/1C or 31E/2C: SAS subsystem

Table 2. SAS base subsystem with tape storage (feature code EJ0E) components
Diagram
location Part name CCINs Physical location codes
A Base backplane12B2C or 2B4A
(two-socket), 2B2D
or 2B4B (one-socket)
Un-P1
B DVD drive1Un-P3-D7
C Base storage interposer 2C1D or 2D1E Un-P2
D, F Base storage backplane with
tape bay
2BE7 Un-P1-D1 (SAS), Un-P1-D2 (USB)
E Disk drives Un-P2-D1 - Un-P2-D3
1This feature is part of the SAS subsystem but separate from feature code EJ0E.
Use Figure 3 on page 4 and Table 3 on page 4 to review the features and locations of the SAS subsystem
with SAS dual-RAID components.
Figure 2. SAS base subsystem with tape storage
SAS subsystem 3

Table 3. SAS dual-RAID subsystem (feature code EJ0F) components
Diagram
location Part name CCINs Physical location codes
A Base backplane12B2C or 2B4A -
(two-socket), 2B2D
or 2B4B -
(one-socket)
Un-P1
B DVD drive1Un-P3-D7
C Dual-RAID storage
interposer
2D1F Un-P2
D Base storage backplane 2BD7 Un-P3
E Disk drives (RAID-0, 5, 6,
10)
Un-P2-D1 - Un-P2-D6
F RAID/Cache storage
controller
2B4C Un-P1-C18, Un-P1-C18-E1
G Cache battery card 2BCF Un-P1-C13
H SAS I/O attachment cable
1This feature is part of the SAS subsystem but separate from feature code EJ0F.
Feature details
SAS RAID adapters
The SAS RAID adapters have the following features:
vA host PCI-x at 66 MHz.
vPhysical link (phy) speed of 3 Gbps SAS supporting transfer rates of 300 MB per second
vOptimized for SAS disk configurations that use dual paths through dual expanders for
redundancy and reliability
vAdapter managed path redundancy and path switching for multiport SAS devices
vEmbedded PowerPC®RISC processor, hardware XOR DMA Engine, and hardware Finite Field
Multiplier (FFM) DMA Engine (for Redundant Array of Independent Disks (RAID) 6)
vSupport for RAID 0, 5, 6, and 10 disk arrays dependent on the feature installed
Figure 3. SAS dual-RAID subsystem overview
4SAS subsystem for the 31E/1C or 31E/2C: SAS subsystem

vRAID disk arrays supported as a boot device
vAdvanced RAID features:
– Hot spares for RAID 5, 6, and 10 disk arrays
– Background parity checking
– Background data scrubbing
– Disks formatted to 528 bytes per sector, providing cyclical redundancy checking (CRC) and
logically bad block checking
– Optimized skip read/write disk support for transaction workloads
Related concepts:
“31E/1C, 31E/1D, 31E/2C, or 31E/2D SAS storage configurations”
Several SAS subsystem configurations are supported for the 31E/1C, 31E/1D, 31E/2C, or 31E/2D system.
Related information:
Serial attached SCSI cable planning
System parts
31E/1C, 31E/1D, 31E/2C, or 31E/2D SAS storage configurations
Several SAS subsystem configurations are supported for the 31E/1C, 31E/1D, 31E/2C, or 31E/2D system.
The configuration you use depends on the combination of SAS features that you installed on your
system. The following table provides an overview of the features and related configurations.
Note: All SAS subsystem configurations for the 31E/1C, 31E/1D, 31E/2C, or 31E/2D systems share the
same integrated base system board (custom card identification numbers (CCIN) 2B2C or 2B4A for the
two-socket model and 2B2D or 2B4B for the one-socket model). The physical location code for the base
system board is Un-P1.
Table 4. SAS subsystem configurations for the 31E/1C, 31E/1D, 31E/2C, or 31E/2D system
SAS
subsystem
configuration
RAID cache
enablement
card
External SAS
components SAS port cables SAS cables Limitations
SAS base
subsystem
(FC EJ0D)
No None None Not applicable vEither solid-state
drives (SSDs) or
hard disk drives
(HDDs) can be
used, but the two
can never be
mixed in the
same RAID array.
SAS base
subsystem
with tape
storage bay
(FC EJ0E)
No None None Not applicable vConnecting to an
external disk
enclosure is not
supported.
vEach set of three
drives can be
HDDs or SSDs.
SAS subsystem 5

Table 4. SAS subsystem configurations for the 31E/1C, 31E/1D, 31E/2C, or 31E/2D system (continued)
SAS
subsystem
configuration
RAID cache
enablement
card
External SAS
components SAS port cables SAS cables Limitations
SAS
dual-RAID
subsystem
(FC EJ0F)
Yes
Note: The
internal dual
RAID
input/output
adapter (IOA)
reports as CCIN
2B4C.
External SAS port SAS cable
assembly for
connecting to an
external SAS
drive enclosure
YI cable (FC 3687) -
System to SAS disk
enclosure, single
adapter/dual path 3
meter
Both SSDs and
HDDs can be used
in the internal disk
enclosure, but can
never be mixed in
the same RAID
array. SSDs and
HDDs cannot be
mixed in the
external disk
enclosure.
Related concepts:
“31E/1C, 31E/1D, 31E/2C, or 31E/2D SAS subsystem service considerations” on page 10
Review several considerations before servicing features within the SAS subsystem.
“Service considerations for the cache battery pack” on page 11
To prevent data loss, follow the procedures before replacing the cache battery pack on the cache RAID
cards.
Related information:
Serial attached SCSI cable planning
31E/1C, 31E/1D, 31E/2C, or 31E/2D SAS subsystem base configuration
This configuration uses the base system backplane.
The following rules apply to this configuration:
vThe base backplane uses six 2.5-inch drives and cannot function in dual-storage I/O-adapter (IOA)
mode or in high-availability (HA) RAID mode.
vThere is a single path to the drives.
vEmbedded backplane adapter provides the Serial Advanced Technology Attachment (SATA) interface to
the DVD drive.
vInternal RAID Enablement adapter slots must be empty (this does not include the six PCI expansion
(PCIe) slots, P1-C2 - P1-C7).
vNon-volatile RAM (NVRAM) provided by the embedded SAS controller module provides support for
drives in JBOD, RAID 0, and RAID 10 formats.
vSolid-state drives (SSDs) and hard disk drives (HDDs) can never be mixed in the same disk enclosure.
– Bays D1 - D6 can have all SSD
– Bays D1 - D6 can have all HDD
Example: Base system backplane
This example shows a base system backplane configuration.
6SAS subsystem for the 31E/1C or 31E/2C: SAS subsystem

The following table lists the details of the base system backplane configuration.
Table 5. Base configuration details
Embedded SAS Configuration details
Storage controller (base backplane) vThis feature is at Un-P1.
vSix drives (Un-P2-D1 - Un-P2-D6) are contained in the
base disk drive backplane.
vEmbedded SAS controller module supports JBOD,
RAID 0, and RAID 10.
vA single path goes to each drive.
vThe embedded adapter is directly mounted on the
backplane and provides the SATA interface to the
DVD device.
31E/1C, 31E/1D, 31E/2C, or 31E/2D SAS subsystem configuration with
tape storage
This configuration uses the base system board with a disk drive backplane that features tape storage in
addition to three disk drive bays.
The following rules apply to this configuration:
vThe base backplane uses three 2.5-inch drives and cannot function in dual-storage I/O-adapter (IOA)
mode or in high-availability (HA) RAID mode.
vNo split backplane is supported.
vThis configuration supports JBOD, RAID 0, or RAID 10 protection for the AIX®system or Linux
system.
vThe embedded backplane adapter provides the SATA interface to the DVD drive and the SAS 3.5-inch
tape unit.
vInternal RAID Enablement adapter slots must be empty (this does not include the six PCI expansion
(PCIe) slots, P1-C2 - P1-C7).
vRAID 10 with two drives is limited. A RAID 10 array with two drives is equivalent to RAID 1
(mirrored drives). A RAID 10 array with one drive is not allowed.
Figure 4. Disk bays controlled by base system backplane
SAS subsystem 7

vIn this configuration, the embedded SAS controller module provides support for disks without RAID
(referred to as JBOD) or RAID drives. However, it does not provide write cache.
vSolid-state drives (SSDs) and hard disk drives (HDDs) can never be mixed in the same disk enclosure.
Example: SAS subsystem configuration with tape storage
This example shows a storage backplane with tape storage.
The following table lists the details of the SAS subsystem configuration with tape storage configuration.
Table 6. Base SAS subsystem with tape storage configuration details
Embedded SAS Configuration details
Storage controller (base backplane) vThis feature is at Un-P1-D1 (SAS), and Un-P1-D2
(USB).
vThree drives (Un-P2-D1 - Un-P2-D3) are contained in
the base disk drive backplane.
vA single path goes to each drive.
vThe embedded adapter is directly mounted on the
backplane and provides the SATA interface to the
DVD drive and the SAS 3.5-inch tape unit.
31E/1C, 31E/1D, 31E/2C, or 31E/2D SAS dual-RAID subsystem
This configuration uses dual-storage I/O-adapter (IOA) mode or high-availability (HA) RAID mode with
internal disk drives.
This configuration increases availability by using dual-storage IOA or high-availability (HA) to connect
multiple adapters to a common set of internal disk drives. It also increases the performance of RAID
arrays. The following rules apply to this configuration:
vA RAID and cache storage controller, battery cards, and the embedded system board adapter make up
the logical RAID adapter.
vThe presence of any of the feature components requires that all the components must be present.
vThe disk drives are required to be in RAID arrays.
Figure 5. SAS subsystem configuration with tape storage
8SAS subsystem for the 31E/1C or 31E/2C: SAS subsystem