Problem Determination Guide - Systems Group

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Frank Ingram Randal Massot Mike Nelson Jeff Parker Karl Solie Mike Woiwood IBM Rochester, MN Tom Engelsiepen IBM San Jose, CA Mark Mendell IBM Toronto, Canada Marc B Dombrowa David M. Singer IBM Yorktown Heights, NY CSM for Blue Gene Development Team: Ling Gao IBM Poughkeepsie, NY ITSO Editing team: Ella Buslovich IBM Poughkeepsie, NY Debbie Willmschen IBM Raleigh, NC Become a published author Join us for a two- to six-week residency program! Help write an IBM Redbook dealing with specific products or solutions, while getting hands-on experience with leading-edge technologies. You'll team with IBM technical professionals, Business Partners or customers. Your efforts will help increase product acceptance and customer satisfaction. As a bonus, you'll develop a network of contacts in IBM development labs, and increase your productivity and marketability. Find out more about the residency program, browse the residency index, and apply online at: ibm.com/redbooks/residencies.html xiv IBM System Blue Gene Solution: Problem Determination Guide
Comments welcome Your comments are important to us! We want our Redbooks to be as helpful as possible. Send us your comments about this or other Redbooks in one of the following ways: ► Use the online Contact us review redbook form found at: ibm.com/redbooks ► Send your comments in an e-mail to: redbook@us.ibm.com ► Mail your comments to: IBM Corporation, International Technical Support Organization Dept. HYTD Mail Station P099 2455 South Road Poughkeepsie, NY 12601-5400 Preface xv
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 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 42 and 43: I²C The Inter-Integrated Circuit (
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
Page 58 and 59: 56 ALL CIOD Complete Front-End Node
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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Mar 31 11:25:43.750 EST: Service Ac
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glsn:/bgl/BlueLight/ppcfloor/bglsys
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EndServiceAction logs its invocatio
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Repeat the discovery command for ea
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2.1 Introduction Whenever you have
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The Configuration section displays
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1 record(s) selected. Then check th
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The default location of control sys
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Table 2-6 Control system log for pe
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2.2.8 Job submission 2.2.9 Racks No
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2.2.10 Midplanes 2.2.11 Clock cards
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2.2.13 Link cards ► Using a DB2 s
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Figure 2-6 BGWEB table showing the
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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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