NEC Express5800/1320Xf Guía de usuario

855-900547-200-A Rev. １ TX7/i9610 NX7700i/5080H-64, NX7700i/5040H-32 Operation Manual CAUTION Before using the product, be sure to read

ix VORSICHUT Handhabung der Lithiumbatterie In diesem Gerät wird eine Lithiumbatterie verwendet. Unsachgemäßer Austausch der Batterie ka

Base Module 855-900547-200 2-64(For 32Way(B)) ---- CELL0 ------------------------------------------- 19:20:23,07/31/2005 --- CELL0 (loc=M-14/23)

Base Module 855-900547-200 2-65(For ISPF) ---- CELL0 ------------------------------------------- 19:20:23,07/31/2005 --- CELL0 (loc=M-00/10)

Base Module 855-900547-200 2-66(For 32Way(H)) ---- MMX00 ------------------------------------------- 19:20:23,07/31/2005 --- MMX00

Base Module 855-900547-200 2-67(For 32Way(B), 8Way, or ISPF) ---- TAG0_e ------------------------------------------ 19:20:23,07/31/2005 --- TAG0_

Base Module 855-900547-200 2-68(For 32Way(B)) ---- XBX_C0 ------------------------------------------ 19:20:23,07/31/2005 --- XBX_C0(loc=M-14/23)

Base Module 855-900547-200 2-69(For 32Way, subsequently listed to the max. XBX Card number.) ---- XBX_C1 ------------------------------------------ 1

Base Module 855-900547-200 2-70(8Way’s internal PCIBAY) ---- PCIBAY0(D) -------------------------------------- 19:20:23,07/31/2005 --- PCIBAY0(D) (l

Base Module 855-900547-200 2-71---- PCIBAY0(D) -------------------------------------- 19:20:23,07/31/2005 --- PCI001: VID:xxxx DID:xxxx PCI err_r

Base Module 855-900547-200 2-72 DPS21 DPS22 INVISIBLE DPS23 DPS24

Base Module 855-900547-200 2-73(Description) Description No. Description (a) Lists partition configuration information. (b) Lists the configuration o

xHandhabung von beschädigten Flüssigkristallanzeigen (LCD-Anzeige) Eine Flüssigkristallanzeige wird in diesem Gerät verwendet. Gehen Sie sorgfältig

Base Module 855-900547-200 2-742.4.6.8. HE (Help) m b u X X X * Always valid without regard to the current system status. Function: This command is

Base Module 855-900547-200 2-752.4.6.9. ML (Message Log) m b u X X X * Always valid without regard to the current system status. Function: This co

Base Module 855-900547-200 2-76(Description) Description No. Description (a) Allows to choose from two modes: one that prompts operator entry for each

Base Module 855-900547-200 2-772.4.6.10. PC (Power Cycle) m b u X * The command is executable to the active partition (after automatic system bo

Base Module 855-900547-200 2-782.4.6.11. RS (Cold Reset System) m b u X * The command is executable to the active partition (after automatic syst

Base Module 855-900547-200 2-792.4.6.12. SG (SP/System Setting) m B u X X X * Always valid without regard to the current system status. Function:

Base Module 855-900547-200 2-80Category Configuration Parameter Default Setting Hot Plug permission [Hot Plug permission] Specifies whether Hot-

Base Module 855-900547-200 2-81SP default FTP Server Configuration: Category Configuration Parameter Default SettingIP address for the default FTP

Base Module 855-900547-200 2-82 Screen examples for partition boot method and hot-plug permission Description No. iSPyz:MNT> sg<ENTER> Displ

Base Module 855-900547-200 2-83Partition boot methods and Hot-plug permissions: | |Wake |Hot-Plug permission part.| AC- | On | PCI-card

xi PL DESCRIPTION FOR OPERATIONAL MANUAL 〔FRENCH〕 z INSTRUCTION FOR PRESERVATION OF THIS MANUAL NOTE: Read this manual carefully before using t

Base Module 855-900547-200 2-84 b) partition boot methods and Hot-plug permission a) display all settings Select ? (c/p/b/a/CR=back) : <ENTER&

Base Module 855-900547-200 2-85 LAN1 IP address : 192.168.100.231 (ISPF only) LAN1 subnet mask : 255.255.255.128 (ISPF only)

Base Module 855-900547-200 2-86Display and modify settings of system and iSP. s) system settings i) iSP settings a) display all settings Selec

Base Module 855-900547-200 2-87default FTP account (CR=skip) : <ENTER> default FTP password (CR=skip) : <ENTER> Re-enter default FTP pas

Base Module 855-900547-200 2-88 i) iSP settings a) display all settings Select ? (s/i/a/CR=exit) : i<ENTER> iSP setting menu: c) LAN/Ser

Base Module 855-900547-200 2-89 Manager IP 2 : N/A (Other than ISPF) community(Trap) : public community(Get) : publ

Base Module 855-900547-200 2-902.4.6.13. SR (Save System CMOS/NvRAM) m b u X * For cautions for using this command, read the following description

Base Module 855-900547-200 2-91ERROR: cmossave/cmos2.bin does not exist. Enter partition number? (0-7/CR=exit) : (k) checking downloaded file. passed

Base Module 855-900547-200 2-922.4.6.14. UB (Bring up BIOS) m b u X * The command is executable to the active partition (after automatic system b

Base Module 855-900547-200 2-932.4.6.15. UP (Bring up System) m b u X * This command is valid to inactive partitions (DC Off). Function: This c

xii z MESURES DE SÉCURITÉ MESURES DE SÉCURITÉ Avant d’utiliser cette unité, lire attentivement ce manuel et prendre les précautions qui y sont in

Operation Procedure 855-900547-200 3-1CHAPTER 3 Operation Procedure 3.1. System Startup 3.1.1. System Startup Procedure When all installation is c

Operation Procedure 855-900547-200 3-2 When the expansion cabinet is used. StartTurn on distribution board.

Operation Procedure 855-900547-200 3-3 Startup Flowchart Step Operation 1 Turn on the power distribution board. 2 Turn on the console PC. 3 Turn

Operation Procedure 855-900547-200 3-4 Locations of the AC switches and AC power circuit breakers in the main cabinet are shown below. These componen

Operation Procedure 855-900547-200 3-5 Figure 3-1 Locations of AC Power Circuit Breakers and AC SWs (Main Cabinet) AC

Operation Procedure 855-900547-200 3-63.1.2. SP Console Messages SP console messages displayed during system startup are explained below. 1) Examp

Operation Procedure 855-900547-200 3-72) Example of SP console screen during system startup Note: When multiple partiti

Operation Procedure 855-900547-200 3-83.2. System Shutdown 3.2.1. System Shutdown Procedure The procedure to turn off the AC power with the AC swit

Operation Procedure 855-900547-200 3-9 StartShut down OS. (See step 1 in next page.) Turn off console PC. (

Operation Procedure 855-900547-200 3-10Shutdown Flowchart Step Operation 1 Enter “shutdown –h now” on the OS console. 2 Check that “Power down.”

xiii Indique qu’il fault débrancher l’unité et éteindre l’interrupteur principal. DANGER! Ne pas accéder à l’intérieur de l’unité

Operation Procedure 855-900547-200 3-113.2.2. SP Console Messages The SP console messages displayed during system shutdown are explained in this se

Operation Procedure 855-900547-200 3-123.3. Emergency System Shutdown with AC SW The AC switch is provided for forced power off in the event that th

Operation Procedure 855-900547-200 3-131) SP console screen and operation during AC LINK setup * The above di

Operation Procedure 855-900547-200 3-143.5. OS Boot CAUTION Use the OS console to operate the EFI Shell. Inputs from the VGA console (PS2 keyboard)

Operation Procedure 855-900547-200 3-153.5.2. OS Boot from the EFI (Extensible Firmware Interface) Boot Manager OS boot options are automatically en

Operation Procedure 855-900547-200 3-163.5.3. EFI Shell The EFI Shell can be activated from the EFI Boot Manager. The EFI Shell provides Shell comman

Operation Procedure 855-900547-200 3-17Command Description cd cd [path] Display/change the current directory. child child Handle Display the dev

Operation Procedure 855-900547-200 3-18Command Description ls ls [-b] [-r] [-a [attrib]] [file] Display directories/file lists. map map [-r|-v|-d

Operation Procedure 855-900547-200 3-193.5.5. OS Boot from EFI Shell In addition to OS boot from the EFI Boot Manager, the OS can be booted by enter

Operation Procedure 855-900547-200 3-20(2) Booting the OS loader Boot OS loader SuSE Linux (elilo).  Image of OS loader boot screen fs0:¥> c

xiv ATTENTION! Manipulation de la pile au lithium Cette unité utilise une pile au lithium. Lorsque la pile est usée, remplacez

Operation Procedure 855-900547-200 3-213.5.6. EFI Devices The device connected to the system is managed as “EFI device path.” This section explains t

Operation Procedure 855-900547-200 3-22 Computing UID: UID x=LIOC*16 LIOX=Logical IOX Number :Logical IOX number: LIOX=0-7 LIOC=Logical IOC Nu

Operation Procedure 855-900547-200 3-23Example: To install the boot device on the PCI bay (PCI module): Host Bus PEX PXH Slot ---------------------

Operation Procedure 855-900547-200 3-243.5.7. EFI Boot Option Maintenance A boot option can be selected on the Boot Option Maintenance Menu which is

Operation Procedure 855-900547-200 3-25Boot Maintenance Menu Options Option Description Boot from a File Boot the OS directly from the EFI applicat

Operation Procedure 855-900547-200 3-263.5.7.1. Boot from a File A boot file can be selected from a list of device files by selecting [Boot from a F

Operation Procedure 855-900547-200 3-273.5.7.2. Add a Boot Option To add a new boot option to the EFI Shell, select [Add a Boot Option] on the Main

Operation Procedure 855-900547-200 3-283.5.7.3. Add Boot Option(s) To delete a boot option or all options, select [Delete Boot Option(s)] from the M

Operation Procedure 855-900547-200 3-293.5.7.5. Manage BootNext Setting To set the most favored boot option for the next boot or reset the BootNext

Operation Procedure 855-900547-200 3-303.5.7.6. Set Auto Boot Timeout To change the timeout value until the next auto boot (TimeValue) from the defa

xvManipulation d’un écran à crystaux liquides déterioré Cette unité contient un écran à crystaux liquides. Lors de la manipulation d’un écr

Operation Procedure 855-900547-200 3-313.5.7.7. Setting the Network Boot To enable PXE Boot, change the EFI Boot Manager using the EFI Boot Option Ma

Operation Procedure 855-900547-200 3-32Changing procedure: 1) Activate the EFI Boot Manager. 2) Select Boot Option Maintenance Menu. 3) Select Add

Operation Procedure 855-900547-200 3-333.5.7.8. Changing BIOS Settings The BIOS settings may need to be changed using the EFI System Configuration Me

Operation Procedure 855-900547-200 3-34OS Setting (Note) -------------------------------------------------------- ------------------- Windows Serve

Operation Procedure 855-900547-200 3-353.6. System Dump The system dump can be produced by following the procedure explained below if the OS is corru

Troubleshooting 855-900547-200 4-1CHAPTER 4 Troubleshooting This chapter shows general actions to errors in the base module and peripheral units. If

Troubleshooting 855-900547-200 4-2• Check that the VGA console brightness is set to the proper level. (4) Console commands cannot be entered. • Ch

Notes on Handling 855-900547-200 5-1CHAPTER 5 Notes on Handling 5.1. Transportation When the product is transported, pack it with the packing materi

Notes on Handling 855-900547-200 5-2 5.4. Cleaning • Wipe the surface of the main and peripheral units with soft cloth. • Take out the power plug of

Notes on Handling 855-900547-200 5-3 5.5. Notes on Installation • Do not put things on the cabinet. It does not have safety measures to prevent thi

xvi The labels listed below are attached to the cabinet of this system. Read the explanation of each label carefully before operating the system.

Notes on Handling 855-900547-200 5-4 ----- Memo -----

xvii165 注※意：アースされていない場合には機器を動作させないこと。 CAUTION:HIGH LEAKAGE CURRENT Grounding circuit continuity is vital for safe operation of machine NEVER OPER

xviii420 422

Disposing of your used NECIn the European UnionEU - wide legislation as implemented in each Member Statethat used

xix 133-314121-GRP MARKINGS 051 複数の装置を 同時に引き出さないで下さい。 ラックの破損、転倒などの事故の原因となります。 Do not pull out more than one component at a time as it may cause d

xx 243-304367-GRP MARKINGS 001 243-306629-GRP MARKINGS 001 002 Note. The cables supplied with this product are designe

xxi Preface This document explains how to operate the hardware of the basic processing system, the main body of the TX7/i9610, NX7700i/5080H-64, and

xxii Contents PL DESCRIPTION FOR OPERATIONAL MANUAL... ii PL BESCHREIBUNG FÜR D

xxiii2.2.11.3. Preventing Accidental Erasure of Data...2-11 2.2.11.4. Cleaning the DAT Unit

xxiv2.4.6.14. UB (Bring up BIOS)...2-92 2.4.6.15. UP (Bring

xxv5.2. DVD-ROM/CD-ROM ...5-1 5.3. Digita

System Overview 855-900547-200 1-1CHAPTER 1 System Overview The TX7/i9610, NX7700i/5080H-64, and NX7700i/5040-32 systems are the servers that imple

System Overview 855-900547-200 1-21.1. Configuration and Specifications of the Base Module The base module of this system is composed of the followin

System Overview 855-900547-200 1-3 (Front) (Rear) Figure 1-2 Layout of Parts in the Main Cabinet Crossbar Interconne

ii PL DESCRIPTION FOR OPERATIONAL MANUAL z INSTRUCTION FOR PRESERVATION OF THIS MANUAL NOTE: Read this manual carefully before using the unit.

System Overview 855-900547-200 1-4 (Front) Figure 1-3 Layout of Parts in the Expansion Cabinet I/OENCLOSUREPOWER BAYI

System Overview 855-900547-200 1-5Table 1-1 Base Module Specifications Main Cabinet CPU CAGE CELL (up to 8 cells can be installed in the cabinet

System Overview 855-900547-200 1-6Table 1-1 Base Module Specifications (Cont’d) Main Cabinet Cabinet size/weight Width 600mm Height 1800mm Depth

System Overview 855-900547-200 1-7Table 1-1 Base Module Specifications (Cont’d) Expansion Cabinet I/O ENCLOSURE (up to 2 I/O enclosures can be i

System Overview 855-900547-200 1-81.2. Expandability This section explains the expandability of this system and available configurations. CAUTION Con

System Overview 855-900547-200 1-91.2.7. Adding Peripheral Units The iSP is installed in the base module to satisfy various customer’s requirement

System Overview 855-900547-200 1-10 Figure 1-4 System Configuration Diagram 10/100Base - TX RS232C(Consol

Base Module 855-900547-200 2-1CHAPTER 2 BASE MODULE This chapter covers operations required on the base module of this system. Locking

Base Module 855-900547-200 2-22.1. Partition Function The base module of this system has the partition function which enables the system to operate as

Base Module 855-900547-200 2-32.2. Name and Function of Components 2.2.1. Main Cabinet (Primary Cabinet) The main cabinet contains the cells, cros

iii z SAFETY PRECAUTIONS SAFETY PRECAUTIONS Before using this unit, read this manual carefully and keep these instructions in order to use th

Base Module 855-900547-200 2-4 Figure 2-3 I/O Enclosure Figure 2-4 I/O Enclosure (A View without the Fil

Base Module 855-900547-200 2-5 Figure 2-5 PCIBAY Numbers in the Main Cabinet PCIBAY0PCIBAY2 PCIBAY3PCIBAY1

Base Module 855-900547-200 2-6 Figure 2-6 PCIBAY Numbers in the Expansion Cabinet PCIBAY4PCIBAY6 PCIBAY7PCIBAY5

Base Module 855-900547-200 2-72.2.7. I/O Module The I/O module is connected to the crossbar interconnect via two 2.4Gbps interface cables. It has eig

Base Module 855-900547-200 2-82.2.8. Power Bay The power bay supplies power to the system. A power bay can contain up to six DPSs (device power suppli

Base Module 855-900547-200 2-92.2.9. iSP One iSP-M card is mounted on the base module of the system as standard equipment. It contains the following

Base Module 855-900547-200 2-102.2.10. DVD-ROM Unit One DVD-ROM unit can be installed for each I/O module. A DVD-ROM unit is mounted on each I/O modul

Base Module 855-900547-200 2-112.2.11. DAT Unit A DAT unit can be mounted on the I/O module in the main or expansion cabinet as optional equipment.

Base Module 855-900547-200 2-12 Figure 2-12 Preventing Accidental Erasure of Data on DAT (Write Protect) 2.2.11.4. Cleaning the DAT

Base Module 855-900547-200 2-132.2.11.7. Life of Data Cartridge (Tape) for the DAT Unit The life of data cartridge according to the frequency of use

iv z CAUTION AND WARNING DESCRIPTION WHEN UNIT IS OPERATING WARNING DO NOT TRY TO ACCESS INSIDE THE UNIT. Only service personnel is

Base Module 855-900547-200 2-14 Figure 2-13 Loading and Unloading DAT DAT slot Main Cabinet I/O MODULE

Base Module 855-900547-200 2-152.2.12. AC SW The AC switch is provided for the use only when emergency power shutdown is required to shirk danger. Do

Base Module 855-900547-200 2-162.3. Consoles The base module contains console interfaces as standard equipment. The consoles connected to the interfac

Base Module 855-900547-200 2-17 Figure 2-15 Console Connection Diagram CPU CAGE SYS BP CELL CARDXBX CARD iS

Base Module 855-900547-200 2-18 Figure 2-16 Console Connection Diagram (Duplicated iSP Configuration) CPU CA

Base Module 855-900547-200 2-192.4. Service Processor (SP) This system contains interfaces to offer advanced system management and RAS function to t

Base Module 855-900547-200 2-202.4.1.3. Console Status and Login Authentication To gain access to console operation, you must first login to the iSP.

Base Module 855-900547-200 2-21 iSP login prompt Main Menu Serial console inoperative TCP-5001 not connected Press ESC Connect TCP5001 Login passw

Base Module 855-900547-200 2-222.4.1.4. Login and Main Menu Immediately after a console is attached to the iSP, login prompts appear on the console,

Base Module 855-900547-200 2-23 (Description) Description No. Description (a) xx is a cabinet ID identifying a particular cabinet in a multi-cabinet

v CAUTION HANDLING THE LITHIUM BATTERY A lithium battery is used in this unit. Incorrect exchange of the lithium battery

Base Module 855-900547-200 2-24 • Possible Events (including operator entries) and System Responses Event System Response Login account or password w

Base Module 855-900547-200 2-252.4.3. OS (BIOS) Console If OS (BIOS) Console is chosen from the iSP Main Menu, I/O to/from the serial controller is r

Base Module 855-900547-200 2-26(Description) Description No. Description (a) If a value (0 to 7) is entered, I/O is redirected to OS Console within th

Base Module 855-900547-200 2-272.4.4. Virtual SOP If Virtual SOP (Virtual System Operator Panel) is chosen from the Main Menu, Virtual SOP appears on

Base Module 855-900547-200 2-28 (Description) Description No. Description (a) Virtual SOP appears if V is entered at this prompt. (b) Virtual SOP sc

Base Module 855-900547-200 2-292.4.4.1. Details of Partition Status Display The status information for each partition consists of the following items

Base Module 855-900547-200 2-302.4.5. SP Command Console If SP Command is chosen from the iSP Main Menu, SP Command Console appears on the console sc

Base Module 855-900547-200 2-312.4.5.1. SP Command Console Buffer The output from SP Command Console may contain some critical information such as c

Base Module 855-900547-200 2-322.4.5.4. SP Command List The following tables contain SP command lists by category: System Control CMD command name

Base Module 855-900547-200 2-33(Reference) System Status Transitions and System Control Commands DC OFFDC ONNot runningReadySW runningUP/PCDN/DFUP/

vi PL BESCHREIBUNG FÜR DAS BENUTZERHANDBUCH z Hinweise zur Aufbewahrung dieses Handbuchs Hinweis: Lesen Sie dieses Handbuch vor Gebrauch des G

Base Module 855-900547-200 2-34 Configuration CMD command name function iSP state HC Hardware Configuration Display and/or modify the hardware config

Base Module 855-900547-200 2-352.4.6. SP Command Reference This section provides command reference describing the details of SP commands. Command av

Base Module 855-900547-200 2-362.4.6.1. DF (Shut down System Power <override>) m b u X * The command is executable to the active partition

Base Module 855-900547-200 2-37(Description) Description No. Description (a) Enter the target partition number at this prompt. If “all” is specified,

Base Module 855-900547-200 2-382.4.6.2. DN (Shut down System Power) m b u X * The command is executable to the active partition (after automatic

Base Module 855-900547-200 2-392.4.6.3. DP (System Dump) m b u X * The command is executable to the active partition (after automatic system boo

Base Module 855-900547-200 2-402.4.6.4. DT (SP Data and Time) m b u X X X * Always valid without regard to the current system status. Function: Thi

Base Module 855-900547-200 2-412.4.6.5. EN (Environmental Information) m b u X * Always valid without regard to the current system status. Fu

Base Module 855-900547-200 2-42(32Way) ---- MAIN cabinet FANs ----------------------------- 19:20:57,01/31/2005 ---- Location FR00 FR01 FR02

Base Module 855-900547-200 2-43Previous/Next page? (p[revious]/n[ext]/e[xit]/CR=next) : <ENTER> (The total number of pages and page numbers d

vii z Sicherheitshinweise Sicherheitshinweise Vor Ingebrauchnahme des Geräts lesen Sie diese Bedienungsanleitung sorgfältig durch und beachten

Base Module 855-900547-200 2-44---- Temperature (Celsius) [4/7] ------------------- 19:20:57,01/31/2005 ---- current threshold

Base Module 855-900547-200 2-45(The numbers of PCI Bay cards are changed on 32Way/8Way and ISPF.) ---- Temperature (Celsius) [7/7] ------------------

Base Module 855-900547-200 2-46(Description) Description No. Description (a) Allows to choose environmental data formats from page format of 24 lines

Base Module 855-900547-200 2-472.4.6.6. FV (Firmware Versions) m b u X X X * Always valid without regard to the current system status. Function: T

Base Module 855-900547-200 2-482.4.6.7. HC (Hardware Configuration) m b u X * For system states and subcommand validity, read the description of s

Base Module 855-900547-200 2-49cmd arg1 arg2 arg3 arg4 Description mmxxy - - - Show the detailed configuration of the ROW under the MMX specified by

Base Module 855-900547-200 2-50cmd arg1 arg2 arg3 arg4 Description cellx n m - Attach the CELL Card having physical CELL number x to partition numbe

Base Module 855-900547-200 2-51cmd arg1 arg2 arg3 arg4 Description - - - - This command is currently not supported.This command can be used to swap

Base Module 855-900547-200 2-52cmd arg1 arg2 arg3 arg4 Description - - - - Use this command to manually inform the iSP of an addition of componen

Base Module 855-900547-200 2-53cmd arg1 arg2 arg3 arg4 Description memdx - - - This command is only valid to the 32Way model. Use it to add MMX

viii WARNUNG Versuchen Sie nicht, sich Zugang zu dem Geräteinneren zu verschaffen Nur dem Fach

Base Module 855-900547-200 2-54cmd arg1 arg2 arg3 arg4 Description pbayx - - - Enable the Power Bay. x is a Power Bay number. The allowable value

Base Module 855-900547-200 2-55cmd arg1 arg2 arg3 arg4 Description rowxzz - - - Enable the ROW. x is a physical CELL number (0-7). zz is a ROW numbe

Base Module 855-900547-200 2-56cmd arg1 arg2 arg3 arg4 Description - - - - Use this command to manually “DISABLE” the components that are current

Base Module 855-900547-200 2-57cmd arg1 arg2 arg3 arg4 Description pcibx - - - Connect PCI Bays to the partitions to which they belong. x: Physi

Base Module 855-900547-200 2-58cmd arg1 arg2 arg3 arg4 Description clkx on|off - - Turn On/Off the LED on the CLK Card. x is a CLK Card number (0

Base Module 855-900547-200 2-59cmd arg1 arg2 arg3 arg4 Description check - - - - This command is used to check the current system configuration

Base Module 855-900547-200 2-60Description of Status Indicator Strings Indicator string Description nonexist. Indicates that a resource is defined to

Base Module 855-900547-200 2-61(Screen Example … Help Screen) Description No. iSPyz:---> hc<ENTER> iSP FW version is Rxx.xx. HC> help

Base Module 855-900547-200 2-62 part7(----) CELL:-------- (--------) IOX:-------- (--------) CIMB:----- ===========================================

Base Module 855-900547-200 2-63(8Way) ==== Summary (loc=M-00/08) =========================== 19:20:23,07/31/2005 === POWBAY0 (loc=M-00/08) pow