000234V556.docx
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000234V556
Exam:
IBM000-234
Title:
AIX5lperformanceandsystemstuning
Version:
V5.56
1.UserscomplainanAIXserverisrunningslow.Whichofthefollowingcommandscanberuntodeterminewhatisconsumingsystemsresources?
A.tprof
B.lpstat
C.psaux
D.entstat
Answer:
C
2.Whenmonitoringasystemusing/usr/bin/vmstatwithaninterval,themetricsunderpagepiandpageporepresentwhichofthefollowingphrases?
A.Thepagestoandfrompagingspacepersecond
B.Thepageintervalsandpageoperationspersecond
C.Thepageinterruptsandpageoperationspersecond
D.Thepagesegmentstransferredbetweenpiandpodevicespersecond
Answer:
A
3.Whichofthefollowingcommandsisusedtodisplaydetailedethernetstatisticsforent0?
A.ifconfigent0
B.entstat-dent0
C.netstat-i
D.lscfg-vlent0
Answer:
B
4.Whichofthefollowingperformancetoolscanbeusedtodetermineifasystemisthrashing?
A.svmonandtprof
B.vmtuneandschedtune
C.psandschedtune
D.vmstatandtopas
Answer:
D
5.Whichofthefollowingtoolsshouldbeusedtoreportin-depthinformationaboutfilefragments?
A.defragfs
B.istat
C.filemon
D.fileplace
Answer:
D
6.WhichofthefollowingmetricsprovidedbytheiostatreportisusedtoinitiallydetermineifasystemisI/Obound?
A.%idle
B.%sys
C.%user
D.%iowait
Answer:
D
7.ToexaminetheExhibit,presstheExhibitbutton.WhileauseriscompilingaCprogram,"vmstat12010"isruntodeterminethecauseofaperformanceproblem.Giventhevmstatoutputasshownintheexhibit,whichofthefollowingconclusionsshouldbedrawnabouttheI/Obottleneck?
A.ThereisafileI/Obottleneck.
B.Therearetoomanyopenfiles.
C.Thereappearstobeabuffershortage.
D.ThereisapagingspaceI/Obottleneck.
Answer:
A
8.Whichofthefollowingcommandsismostusefulininitiallycollectingdatatodetermineanetworkperformanceproblem?
A.ping
B.trace
C.ifconfig
D.lsattr
Answer:
A
9.Afterrunningthevmstatcommand,whichofthefollowingwouldmostlikelycausethevalueintheblockedcolumntobeunusuallyhigh?
A.Kernelthread
B.Toomanyusers
C.Memoryshortage
D.Networkcontention
Answer:
A
10.WhichofthefollowingcommandsshouldbeusedtomonitordiskutilizationduringthetimeasystemisexperiencingadiskI/Operformanceproblem?
A.istat
B.topas
C.vmstat
D.filemon
Answer:
B
11.Whichofthefollowingcommandsshouldbeusedtoshowhowmuchdataisreadfromorwrittentoaparticularlogicalvolume,giventhereareseveralotherlogicalvolumesonthesamedisk?
A.sar
B.lslv
C.iostat
D.filemon
Answer:
D
12.ToexaminetheExhibits,presstheExhibitbutton.Usingthecommandoutputasshownintheexhibits,whichofthefollowingconclusionsismostappropriatetodraw?
A.ThereisanI/Obottleneck.
B.Themachineneedsmorememory.
C.ThemachinehasaCPUbottleneck.
D.Apagingspacevolumeneedstobeaddedtohdisk1orhdisk2.
Answer:
A
13.Whichofthefollowingcommandsdisplaysthenumberofsystemcallspersecondthatarebeingexecuted?
A.sar
B.pstat
C.iostat
D.filemon
Answer:
A
14.Whichofthefollowingcommandsshouldbeusedtoviewandchangethenetworkfilesystemtuningparametersavailableonthesystem?
A.no
B.nfso
C.vmtune
D.exportfs
Answer:
B
15.Whichofthefollowingcommandsshouldbeusedtosetnetworkattributesonacurrentlyrunningkernel?
A.no
B.chdev
C.vmtune
D.schedtune
Answer:
A
16.Whichofthefollowingtoolsshouldbeusedtoreportcurrentnetworkstatusandisoftenusedtocheckthereliabilityofanetwork?
A.netpmon
B.netstat
C.nfsstat
D.vmstat
Answer:
B
17.Inaniostatreport,whichofthefollowingoptionsbestdescribesthevalueof%idle?
A.Arepresentationoftheequation（tps/kbps）*100
B.Thepercentageoftimethedisksareidlewithnoactivity
C.ThepercentageoftimethedisksareidlewithnooutstandingCPUrequests
D.ThepercentageoftimetheCPUisidlewithnooutstandingdiskI/Orequests
Answer:
D
18.WhichofthefollowingcommandsshouldbeusedtodetermineDNSnameresolutionperformance?
A.iptrace
B.vmstat
C.hostname
D.ifconfig
Answer:
A
19.Inaniostatreport,whichofthefollowingoptionsbestdescribesthevalueof%iowait?
A.TheamountoftimetakentoserviceanI/Ointerrupt
B.ThepercentageoftimeCPU（s）arewaitingforpageins
C.ThepercentageoftimetheCPU9（s）arewaitingonnetwork
D.ThepercentageoftimetheCPU（s）arewaitingforoutstandingdiskI/Orequests
Answer:
D
20.Atypicalexampleofaprocess#19082inthe/procfilewouldbe:
#ls-l/proc/19082
total0
dr-xr-xr-x1rootsystem0Sep1515:
12.
dr-xr-xr-x1rootsystem0Sept1515:
12..
-rw-------1rootsystem0Sept1515:
12as
-r--------1rootsystem128Sept1515:
12cred
--w-------1rootsystem0Sept1515:
12ctl
dr-xr-xr-x1rootsystem0Sept1515:
12lwp
-r--------1rootsystem0Sept1515:
12map
dr-x------1rootsystem0Sept1515:
12object
-r--r--r--1rootsystem448Sept1515:
12psinfo
-r--------1rootsystem1024Sept1515:
12sigact
-r--------1rootsystem1520Sept1515:
12status
-r--r--r--1rootsystem0Sept1515:
12sysent
Writingtowhichofthefollowingfileswillallowtheownertostopaprocess?
A.status
B.sysent
C.ctl
D.as
Answer:
C
21.Whilemonitoringasystemusingvmstat,whichofthefollowingoptionsmostlikelyindicatesthatthesystemisCPUbound?
A.risgreaterthan40
B.idisgreaterthan50
C.sumofidandwaequals50
D.sumofusandsyequals100
Answer:
D
22.WhichofthefollowingstatementsisTRUEconcerningthepocolumnofthevmstatcommand?
A.Thesysishighwhenpoishigh.
B.Theporepresentsthenumberofpagesteals.
C.Thelowvaluesusuallyindicateinsufficientpagingspace.
D.Thelowvaluesusuallyindicatesufficientmemoryfortheload.
Answer:
D
23.Whichofthefollowingcommandsshouldbeusedtomonitorthenumberofbytesreadonanygivendisk?
A.tprof
B.topas
C.filemon
D.vmstat
Answer:
B
24.ToexaminetheExhibit,presstheExhibitbutton.WhileadeveloperiscompilingaCprogram,"vmstat12010"isruntodeterminethecauseofaperformanceproblem.Usingthevmstatoutputasshownintheexhibit,whichofthefollowingconclusionsismostappropriatetodrawaboutthemachine?
A.Themachinehastoomanyusers.
B.ThemachinehasanI/Obottleneck.
C.ThemachinehasaCPUbottleneck.
D.Themachinehasamemorybottleneck.
Answer:
D
25.WhichofthefollowingcommandswillresetNFSoptionstotheirdefaults?
A.nfso-d
B.nfso-c
C.startsrc-gnfs-d
D.startsrc-gnfs-r
Answer:
A
26.Whichofthefollowingtoolsisusedtoreportthelocationoflogicalpartitionsofafilesystemonaphysicalvolume?
A.lsfs
B.iostat
C.lslv-p
D.lsvg-p
Answer:
C
27.Fromthispartialexampleofreport__myprog.all,generatedusingthetprofcommand,whichofthefollowingconclusionscanbedrawn?
ProcessPIDTIDTotalKernelUserSharedOther
-----------------------------------------
myprog42284884301515300000
X544356242810270
PID.1032103220652424000
PID.10321032466433000
sh4308724522000
A.ProcessPID.1032isusingahighamountofCPUutilizationtimeinkernelprocessesonlyandneedstobeinvestigated.
B.MyprogisusingahighamountofCPUutilizationtimeinuser.Thisapplicationmayneedtobetuned.
C.MyprogisjustusingCPUutilizationtimeefficientlyandnothingneedstobeinvestigated.
D.ProcessPID.1032hasmultipleentrieswhichmeansthatthisprogramisnotfunctioningcorrectly,andshouldbeinvestigatedfurther.
Answer:
B
28.Asystemhasusersdoinginteractiveworkwhilebackgroundjobsarerunning.Interactiveusersarerequestingthatsystemresponsetimebeimprovedforforegroundprocesses.Whichtuningparametersshouldbechangedtoaccomplishthis?
A.schedtune-h
B.schedtune-r
C.vmtune-f
D.schedtune-w
Answer:
B
29.Thenfsstat-ccommandshowszerobadxid,butretransandtimeoutsaresizeable,whatisthemostprobablecauseoftheproblem?
A.Toomanynfsd'srunning
B.Clientandserverwithdifferentbuffersizes
C.Bridges,routersorgatewaysarereceivingtoomanyfragmentatedpackets
D.Toofewnfsd'srunning
Answer:
B
30.Thenicevalueis60inthepslisting.Whichcommandisusedtochangethistoavalueof20?
A.renice-n-20{PID}
B.renice-n20{PID}
C.renice-n-40{PID}
D.renice-n40{PID}
Answer:
C
31.WhichofthefollowingcommandsshouldbeusedtoresettheVirtualMemoryManagertuningparameterstotheirdefaultvalues?
A.schedtune-t
B.vmtune-R
C.schedtune-r
D.schedtune-D
Answer:
D
32.ToexaminetheExhibit,presstheExhibitbutton.Usingthe"ps-el"outputasshownintheexhibit,whichofthefollowingconclusionsismostappropriatetodraw?
A.Thesnmpdprocessisrunningatafixedpriorityof60
B.Ifboththesyncdprocessandtheportmapprocessbecomeavailabletoberunatthesametime,thenthesyncdprocesswouldgetscheduledfirst
C.Ifboththeuserprogprocessandtheqdaemonprocessbecomeavailabletoberunatthesametime,thentheqdaemonprocesswouldgetscheduledfirst
D.Ifboththesyslogdprocessandthellbdprocessbecomeavailabletoberunatthesametime,thenthellbdprocesswouldgetscheduledfirst
Answer:
D
33.Thesystemadministratornoticesthatafterrunningnetstat-rn,severalsmallc'sareshowingupundertheflagscolumns,androutesthatwerenotdefinedarealsoshowingup.Howcantheseclonedroutesbestopped?
A.Bydefaultclonedroutesareturnedon.Toturnclonedroutesoff
issuethecommand:
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