AX4-5 Series Hardware and Operational Overview December 2, 2007 This overview describes the major hardware features of AX4-5 series storage systems. For greater clarity, the illustrations in this document show the storage-system chassis independent of a cabinet or deskside mounting Topics include Storage-system components ........................................................... 2 Disk and filler modules .................................................................. 5 Storage processors (SPs) ................................................................. 7 Link control cards (LCCs) .............................................................. 8 Power/cooling modules ................................................................ 9 Standby power supplies (SPSs) ....................................................... 10 Powerup and powerdown sequence ............................................... 11 1
Transcript
AX4-5 SeriesHardware and Operational
OverviewDecember 2, 2007
This overview describes the major hardware features of AX4-5 seriesstorage systems.
For greater clarity, the illustrations in this document show the storage-systemchassis independent of a cabinet or deskside mounting
Topics include
Storage-system components ........................................................... 2Disk and filler modules.................................................................. 5Storage processors (SPs)................................................................. 7Link control cards (LCCs) .............................................................. 8Power/cooling modules ................................................................ 9Standby power supplies (SPSs)....................................................... 10Powerup and powerdown sequence ............................................... 11
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Storage-system components
The AX4-5 series storage system consists of rack-mountablestorage-system enclosures, 3.5 inches (2U) high, that contain 4 to 12Serial Advanced Technology Attachment (SATA) or Serial AttachedSCSI (SAS) disk drives.
The AX4-5 and AX4-5SC storage systems use a Fibre Channel arbitratedloop (FC-AL) or Fibre Channel switch (FC-SW) as an interconnectinterface to host servers. The AX4-5i and AX4-5SCi storage systems usethe Internet Small Computer System Interface (iSCSI) protocol.
The AX4-5, AX4-5SC, AX4-5i, and AX4-5SCi are also called the AX4-5F,AX4-5FSC, AX4-5I, AX4-5ISC, respectively.
Navisphere® Express software manages the storage systems from anyqualified workstation on a shared Ethernet LAN. Sophisticated RAID(redundant array of independent disk) technology and data cachingprevent data loss in case of component failure. Redundant hardwareoptions provide levels of high availability usually restricted to muchlarger (and more expensive) storage systems. Besides economicaldisks, the AX4-5 series storage systems include the following majorcomponents:
A disk-processor enclosure (DPE-AX). A DPE-AX contains one(AX4-5SC or AX4-5SCi) or two (AX4-5 or AX4-5i) storage processors(SPs), each with:
One dual-inline memory module (DIMM)
One serial port (RJ45 connector) for service
One 10/100 Ethernet LAN port (RJ45 connector) formanagement
For the AX4-5 or AX4-5i, one serial port for connection to astandby power supply (SPS)
One input/output (I/O) module per SP, each with:
− For the AX4-5 or AX4-5SC, two 4-Gbps Fibre Channel hostports with small form factor pluggable (SFP) connectors
− For the AX4-5i or AX4-5SCi, two Gigabit Ethernet (GigE)ports
2 Hardware and Operational Overview
Two power supply/system cooling (power/cooling) modules
Figure 1 shows an AX4-5 DPE-AX, which has Fibre Channel I/Omodules; Figure 2 shows an AX4-5i DPE-AX, which has iSCSI insteadof Fibre Channel I/O modules; Figure 3 shows an AX4-5SC DPE-AX;and, Figure 4 shows an AX4-5SCi.
FRU Label FRU Label
CL3725
FibreSP B service
SP B management SP B fault LED
SP B power LED
Power supply Bfault LEDPS B on
Fan B faultLED
Power supply Afault LEDPS A on
Fan A faultLED
FibreSP A service
SP A management
SP A fault LED
SP A power LED
Figure 1 AX4-5 DPE-AX (rear view)
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Figure 2 AX4-5i DPE-AX (rear view)
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Figure 3 AX4-5SC DPE-AX (rear view)
FRU Label FRU Label
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Figure 4 AX4-5SCi DPE-AX (rear view)
Hardware and Operational Overview 3
AX4-5 and AX4-5i systems include a standby power supply (SPS); asecond SPS is optional. AX4-5 and AX4-5i systems support as many asfour optional disk array enclosures (DAE-AXs). Like the DPE-AX, eachDAE-AX includes two power/cooling modules and can contain a totalof twelve disk drives. Instead of SPs, a DAE-AX has two link controlcards (LCCs) that manage disks on a single redundant back-end bus.
You can install, upgrade, or replace all of the major storage-systemcomponents without professional assistance.
4 Hardware and Operational Overview
Disk and filler modules
Each DPE-AX includes at least four hard disk drives. The first fourdisks, marked 0-3, are system disks (sometimes called vault disks) andcontain vital software specific to the physical slot they occupy in thechassis. Do not move a system disk from its assigned slot to another slot.Remove a system disk only if you need to replace it because it failed.
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Figure 5 DPE-AX system (vault) disks
If a drive fails, you can replace it with another while the storage systemcontinues running; software rebuilds the contents of the original diskonto its replacement.
DPE-AX and DAE-AX chassis have twelve slots for disk modules. Anyunoccupied disk module slot requires a filler module to maintain airflow.
Disk modules
Each disk module, shown in Figure 6, consists of one disk drive in acarrier. You can add or remove a disk module while the storage systemis powered up, but you should exercise special care when removingdrives while they are in use.
Hardware and Operational Overview 5
EMC2830
Figure 6 Disk module
Disk drives
The disk drives are standard 3.5-inch (8.75-cm) by 1.0-inch (2.54-cm)serial advanced technology attachment (SATA) or serial attachedSCSI (SAS) drives. For a detailed list of supported disk drives andthe minimum revision of the FLARE® operating environment (OE)that supports each disk, refer to the Disk and FLARE OE Matrix under“Technical description” on the Learn page on the storage-systemsupport website or contact your service provider.
Drive carrier
The disk drive carrier is a plastic assembly that provides smooth,reliable contact with the enclosure slot guides and system boardconnectors. It has a handle with a latch and spring clips. The latchholds the disk module in place to ensure proper connection with theconnectors.
6 Hardware and Operational Overview
Storage processors (SPs)
The storage processor (SP) is the storage system’s intelligent componentand acts as the input/output (front end) and data storage (back end)control center. Besides the processor board and memory DIMM, eachSP includes an I/O module that determines the connection protocolto host servers.
DPE-AX systems with two SPs support write caching for increasedperformance. The redundant storage processors also provide highavailability should one SP fail or lose power.
Hardware and Operational Overview 7
Link control cards (LCCs)
Optional disk array enclosures (DAE-AXs) do not include SPs, but uselink control cards (LCCs) to support additional disk capacity. The LCCsin each DAE-AX connect to expansion ports on SPs or other LCCs withserial-attached SCSI (SAS) expansion cables to create a redundantback-end bus that can support both SATA and SAS drives. Each LCCincludes a display indicating the enclosure address of the DAE-AX; theaddress is assigned automatically by the system. LCCs also include aservice port connector. An LCC receives input from the previous SPor LCC on the bus through a primary connector (marked by a circlesymbol) and can pass input to the next LCC on the bus through anexpansion connector (marked by a diamond symbol).
Figure 7 shows a DAE-AX with two LCCs below the power/coolingmodules.
CL3775
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Figure 7 DAE-AX (rear view)
8 Hardware and Operational Overview
Power/cooling modules
Each power/cooling module integrates an independent power supplyand blowers into a single module. The power supply in each moduleis an auto-ranging, power-factor-corrected, multi-output, offlineconverter.
The power/cooling modules, A and B, are located above the SPsor LCCs. They share load currents and provide power and coolingfor an entire enclosure. An SP, LCC, or power/cooling module withpower-related faults does not adversely affect the operation of anyother component. If one power/cooling module fails, the othercompensates until the failed module is replaced. If the failed module isin a dual-SP DPE-AX, the system also disables write caching. Removinga power/cooling module from the enclosure causes a cooling fault thatwill shut down the enclosure within two minutes.
Hardware and Operational Overview 9
Standby power supplies (SPSs)
A 1U, 1000-watt DC SPS provides backup power for SP A. An optionalsecond SPS supports SP B. During a power failure, the SPSs allow writecaching to continue, which prevents data loss. A faulted or not fullycharged SPS disables the write cache. Each SPS rear panel has one ACinlet power connector with power switch, AC outlets for the DPE-AXSPs, and one connector for serial connection to an SP. Figure 8 showsthe SPS connectors and status lights.
CL3881
AC powerconnector
Powerswitch
SPinterfaceDPE-AX
Active(green)
Replacebattery(amber)
On battery(amber)
Fault(amber)
Figure 8 1000–watt SPS connectors, power switch, and status lights
You can replace an SPS while the storage system is powered up.
10 Hardware and Operational Overview
Powerup and powerdown sequence
A DAE-AX does not have a power switch. It powers up immediately and itslight begins blinking once it is connected to a live power source.
Powering up the storage system
1. Verify the following:
Master switch/circuit breakers for any cabinet/rack power stripare off.
The power cord for power/cooling module A in the DPE-AX(viewed from the rear, A is the right side of the enclosure) isplugged into the SPS, if present, and the power cord retentionbails are in place. In a storage system without an SPS, the powercord for power/cooling module A is plugged directly into apower source.
The power cord for power/cooling module B is plugged into thenearest power distribution unit on a different circuit feed thanthe SPS or module A. In systems with two SPSs, power/coolingmodule B is plugged into its corresponding SPS.
In a dual-SP system, the serial connection (sense cable) betweenSP A and SPS A is in place. If the system has two SPSs, the serialcable between SP B and SPS B is in place.
The power cords for the SPSs and any DAE-AXs are pluggedin; the power cords for the A and B sides do not share a powersource; and, the power cord retention bails are in place.
Any other devices in the cabinet are correctly installed andready for powerup.
Figure 9 shows a storage system with one SPS correctly cabled forhigh availability.
Hardware and Operational Overview 11
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B A
Figure 9 Power cord and serial (sense) cable connections
2. Turn on the master switch/circuit breakers for each cabinet/rackpower strip.
The DAE-AXs power up immediately and their lights begin blinking oncethey are connected to a live power source.
3. If present, turn the SPS power switches to the on position (Figure10).
CL3781
Figure 10 SPS power switch (SPS A shown)
4. Press the power button on SP A (Figure 11).
SP B powers up automatically when SPA powers on.
12 Hardware and Operational Overview
FRU Label FRU Label
CL3766
Figure 11 SP power button
The storage system can take 8-10 minutes to complete its powerup.
The system fault light on the front of the DPE-AX and the SPSrecharge lights on the rear of the SPS commonly stay on for severalminutes while the SPS fully charges.
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Figure 12 DPE-AX system fault light and SPS recharge light
If any amber lights not related to the SPS recharge remain on for morethan 8-10 minutes, make sure the storage system is correctly cabled.Most amber lights indicate problems you can solve later, once yourstorage system management software is available to help youtroubleshoot the system.
Hardware and Operational Overview 13
If the power buttons do not remain solid/steady green, contactyour authorized service provider.
Powering down the storage system
! CAUTION
Never shut down a DPE-AX by disconnecting the AC power cords forits power/cooling modules. Bypassing the controlled powerdown inthat manner prevents the system from saving any write cache data tothe system drives, and may result in data loss.
1. Stop all I/O activity to the DPE-AX, and if the server connected tothe DPE-AX is running the AIX, HP-UX, Linux, or Solaris operatingsystem, back up critical data and then unmount the file systemson storage-system virtual disks.
Stopping I/O allows the SP to save any cache data to the systemdrives, and may take some time. The length of time depends oncriteria such as the size of the cache, the amount of data in thecache, the type of data in the cache, and the target location on thedisks, but it is typically less than one minute. We recommend thatyou wait five minutes before proceeding.
2. For a dual-SP system, after five minutes, use the power switch oneach SPS to turn off power to its corresponding SP.
SPs with power/cooling modules connected to an SPS power downwithin two minutes.
3. Push the power button on SPs that are not connected to an SPS – SPB in a single-SPS system and SP A in a single-SP DPE-AX.
EMC believes the information in this publication is accurate as of its publication date. Theinformation is subject to change without notice.
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