Problem Determination Guide - Systems Group

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I²C The Inter-Integrated Circuit (I²C) bus (and protocol) is used to interface with the fan control logic and temperature sensors in the Blue Gene/L system (Figure 1-23). Data such as fan speed and voltages are also reported using this 2-wire serial protocol. I²C Network Rear Link Card Node Card Node Card Node Card Node Card Node Card Node Card Node Card Node Card BPM iDo iDo iDo iDo iDo iDo iDo iDo iDo Link Card iDo Figure 1-23 Service network showing JTAG and I²C connections 1.3.2 Functional network The functional network connects the Blue Gene/L I/O nodes, Service Node, Front-end Nodes (FENs), and file system providers together in one network. The functional network: ► Provides system software and application data access to the I/O and Compute nodes, because there is no persistent data storage inside the Blue Gene/L racks. This is done through the I/O nodes over the functional network, in the form of NFS GPFS and mounts from external sources. (For more information, see Chapter 5, “File systems” on page 211.) 24 IBM System Blue Gene Solution: Problem Determination Guide Midplane Network Midplane iDo iDo iDo iDo iDo Switch iDo iDo iDo iDo iDo FAN Front Link Card Node Card Node Card Node Card Node Card iDo Node Card Node Card Node Card Node Card Link Card Service Card JTAG Network Service Network Service Node (idoproxy)
► Communicates stdin, stdout, and stderr from the Compute Nodes back from where the application was submitted through the ciod and ciodb processes that are running on the I/O Node and Service Node (as shown in Figure 1-24). For more information, see 1.4, “Service Node” on page 29. Figure 1-24 Functional network Chapter 1. Introduction 25
Page 1: IBM System Blue Gene Solution Probl
Page 4 and 5: Note: Before using this information
Page 6 and 7: 1.7.5 Microloader . . . . . . . . .
Page 8 and 9: 4.4.2 Principles of operation in a
Page 10 and 11: Installing LoadLeveler on SN and FE
Page 12 and 13: Trademarks The following terms are
Page 14 and 15: He holds a Master's Degree in Elect
Page 16 and 17: Frank Ingram Randal Massot Mike Nel
Page 18 and 19: xvi IBM System Blue Gene Solution:
Page 20 and 21: 1.1 Blue Gene/L system overview In
Page 22 and 23: Figure 1-2 Card positions in the fr
Page 24 and 25: 1.2.2 Midplane As the name suggests
Page 26 and 27: 1.2.5 Node card As an application r
Page 28 and 29: Figure 1-8 Node card center LED pan
Page 30 and 31: Status LEDs are located on the righ
Page 32 and 33: There are 20 fan units (clusters) p
Page 34 and 35: The BPMs also have status LEDs, as
Page 36 and 37: Figure 1-17 Link card that shows th
Page 38 and 39: Fan assemblies: Rxx-Mx-Ax Fan assem
Page 40 and 41: 1.3.1 Service network The service n
Page 44 and 45: 1.3.3 Three dimensional torus (3D t
Page 46 and 47: programmed as a global logical “O
Page 48 and 49: ► Configuration data: Includes sy
Page 50 and 51: 1.5 Front-End Node A Front-End Node
Page 52 and 53: BusyBox is open source software. Yo
Page 54 and 55: 1.8 Boot process, job submission, a
Page 56 and 57: After the chips are initialized, th
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Page 60 and 61: Frontend Node Job Job Scheduler mpi
Page 62 and 63: 1.9.5 CableDiscovery CableDiscovery
Page 64 and 65: 1.10.1 Discovery logs SystemControl
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Page 70 and 71: EndServiceAction logs its invocatio
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Page 74 and 75: 2.1 Introduction Whenever you have
Page 76 and 77: The Configuration section displays
Page 78 and 79: 1 record(s) selected. Then check th
Page 80 and 81: The default location of control sys
Page 82 and 83: Table 2-6 Control system log for pe
Page 84 and 85: 2.2.8 Job submission 2.2.9 Racks No
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2.2.15 Link summary You can view th
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2.2.16 Node cards Example 2-14 Disp
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Figure 2-10 Top of the page for the
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2.2.18 Compute or processor cards C
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To check the number of processor ca
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etc/shadow:bglsysdb:$1$SwI1..4e$iGN
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4. Use the /bin/ping command to che
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If you discover issues during the c
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2. If you need to restart BGLMaster
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2. After you are connected to the c
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Apr 05 17:20:57 (I) [1090516192] te
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2.3.8 Check that a simple job can r
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Figure 2-16 BGWEB showing job Infor
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To check the control system server
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If there is an issue with rsh, then
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2.3.13 Check the physical Blue Gene
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This methodology also allows someon
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- Hardware 3.2, “Hardware monitor
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BRIDGE (Debug): rm_add_job() - Comp
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112 IBM System Blue Gene Solution:
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3.1 Introduction This chapter expla
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Using the GUI If you have a graphic
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Figure 3-2 Querying the environment
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3.3.1 Starting the tool Figure 3-4
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Figure 3-5 Missing hardware in a re
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Block information The block informa
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In addition, the Show RAS events fo
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Figure 3-11 RAS drill down showing
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Figure 3-14 Testcase highlighting t
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3.4.1 Test cases The diagnostics su
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3.4.2 Starting the tool Test case D
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While the Web interface provides a
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Apr 06 18:59:41 (I) [1079031008] {1
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4.1 Parallel programming environmen
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4.2 Compilers The following steps e
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Because these RPMs can be downloade
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4.2.2 The IBM XLC/XLF compilers Thi
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of providing this access for the ad
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The system administrator can set up
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Note: A similar configuration is pe
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► DB_PROPERTY This setting is def
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BRIDGE (Info) : The machine serial
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In Figure 4-3, clicking Runtime dis
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The Web page shown in Figure 4-4 al
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Figure 4-5 shows a diagram of the j
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Users and system administrators can
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A node part of a LoadLeveler cluste
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4.4.2 Principles of operation in a
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Start daemon (startd) runs on each
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The binaries are located in /bgl/Bl
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Because these variable are user spe
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4.4.8 LoadLeveler job submission pr
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Figure 4-14 shows the process of Lo
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Steps 5 and 6: Initializing the par
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Steps 8 and 9: Starting the paralle
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Service Node Central Manager Figure
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4. One of the start daemons is down
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Z = 0 ===== +------------+ | R000|
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Z = 0 ===== +----------------------
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You can use the llq -l command to
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Submitting Host: bglfen1.itso.ibm.c
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Note: The JOBID from Blue Gene/L da
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► #@ arguments This keyword conta
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LoadLeveler processes, logs, and pe
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You can configure the LoadLeveler d
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► STARTD_RUNS_HERE This keyword s
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For example, knowing how sockets wo
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5.1 NFS and GPFS In a basic configu
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sshd (optional) Starts the secure s
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1. Create NFS Server with storage a
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5.2.4 NFS checklists the simplest p
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Step 2 - Check if the NFS-FS can be
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# It mounts a filesystem on /scratc
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5.3 GPFS Example 5-6 Recommended ne
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However, if you have the following
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nodes and these have no boot/OS dis
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Important: The GPFS code that is in
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5.3.6 Creating the GPFS file system
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Installing the GPFS code for SN Fig
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You should see a list similar to th
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172.30.1.1 bglsn_fn OpenPower Servi
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Having created the /tmp/authorized_
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When the "GPFS_STARTUP=1" line is i
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Creating the bgIO cluster After you
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Mon Mar 20 14:14:34 2006: mmfsd rea
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Example 5-21 Telling clusters to au
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To mount the GPFS file system on th
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Example 5-25 Node definition file f
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5.3.9 GPFS problem determination me
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Checking the GPFS log files for pro
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Node number Node name GPFS state --
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Example 5-35 shows the output of th
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We also ran the mmlscluster command
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5.3.11 References For more informat
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6.1 Introduction In some scenarios,
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6.2.1 Hardware error: Compute card
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Example 6-2 mmcs message: service c
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Problem determination When we boote
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Looking in the system logs we see t
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Lessons learned The /tmp directory
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Mar 14 12:27:04 (I) [1079567584] Ab
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Lessons learned We learned the foll
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glsn:/bgl/BlueLight/ppcfloor/bglsys
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6.2.12 DB2 not started on the SN In
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Now we start DB2 on the SN; after D
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After changing the db.properties wi
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Mar 15 17:04:33 (I) [1086321888] ro
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Current message level: 0x00000007 (
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As EndServiceAction did not complet
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Mar 13 16:02:17 (I) [1084843232] ro
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Problem determination In this scena
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** error ** ** error ** ** error **
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Mar 28 15:56:48 (I) [1088451808] ro
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-rw-r--r-- 1 root root 220 Mar 19 1
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Summary: api = MPIIO (version=2, su
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Are you sure you want to continue c
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Now that we know that the GPFS conf
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Lessons learned From this scenario,
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We can see that the partition is st
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Ckpt Execute Dir: Restart From Ckpt
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We realize that we cannot find eith
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Note: Even though we can manually c
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-rw-r--r-- 1 root root 58882 Mar 31
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Step 1 Now we install the new Blue
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We used the updated script to retri
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Example 6-66 shows the files that w
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The BACKFILL scheduler with Blue Ge
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Log will be written to /bgl/BlueLig
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However, we were able to ssh to the
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8. We try to run a job. We start by
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Summary: api = MPIIO (version=2, su
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11.We test that we can boot a block
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delaying 1 seconds . . . write 6.61
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clients = 128 (16 per node) repetit
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Problem determination When we ran t
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7 ionode6 active 8 ionode7 active 9
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6.4.2 The mpirun command: environme
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BE_MPI (Info) : == BE completed ==
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Problem determination By default, t
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# bglfen1 test1 bglfen2 test1 bglsn
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6.4.4 LoadLeveler: scenarios descri
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FE_MPI (Info) : Scheduler interface
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The log messages indicate the job c
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Problem description A job submitted
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MAX_JOB_REJECT = 0 # # When ACTION_
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From the StartLog, we can see that
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Detailed checking We start by check
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Example 6-121 LoadLeveler basic che
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We first check the LoadLeveler Nego
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The error messages shown in Example
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04/05 15:30:28 TI-6 LoadLeveler: Ba
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To detect the left-over socket file
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7.1 Cluster Systems Management This
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7.1.2 Monitoring the Blue Gene/L da
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To simplify the earlier monitoring
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Description = This sensor is update
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To verify that all is working prope
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7.1.5 Miscellaneous related informa
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The cryptographic technique are emp
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► RC2/RC4 algorithms RC2: block c
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Secure shell server The secure shel
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Secure shell client programs also d
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► If this file exists, it checks
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► We restarted the ssh daemons on
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Installing LoadLeveler on SN and FE
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Create the home directory for user
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Example A-3 presents a sample LoadL
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Example A-4 presents a sample LoadL
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CKPT_CLEANUP_INTERVAL = 86400 # sam
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# STARTER = $(BIN)/LoadL_starter ST
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# MAX_JOB_REJECT = 0 # # When ACTIO
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The /bgl/dist/etc/rc.d/init.d/sitef
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# ---------------------------------
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# Parameter 1: "start" - perform st
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gl/BlueLight/ppcfloor/docs/ionode.R
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------------------------------- The
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BGL_BLOCKID Name of block BGL_VERBO
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to by Normally, you should not have
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] to by 440 IBM System Blue Gene So
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GPFS_VAR_DIR directory. GPFS_CONFIG
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$BGL_SITEDISTDIR/etc/rc.d/rc3.d dir
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# Handle startup (start) and shutdo
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Support for Subnets ---------------
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mv ramdisk.img2.gz ramdisk.img.gz L
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RSH Remote Shell SHA Secure Hash Al
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Online resources These Web sites an
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clock signal 11 cluster 168 Cluster
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mmauth 247-248, 261 mmchconfig 247,
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XL compilers 148 XLC/XLF 148 XLC/XL
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IBM System Blue Gene Solution Probl
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