- A client needs more disk space for another volume group and has decided to
use hdisk12 from the uservg volume group. Theclient realizes that paging space,
paging12, must first be removed from hdisk12. Which of the following is the
correct sequence of events?
-
A.
- chps -an paging12, rmps paging12
-
B.
- swapoff paging12, rmps paging12
-
C.
- swapoff paging12, reboot, rmps paging12
-
D.
- chps -an paging12, swapoff paging12, rmps
paging12
- A customer would like to remove an unneeded, but active, paging space
called paging00. What is proper sequence of steps to accomplish this?
-
A.
- Remove the paging space with the rmps command and reboot the
system.
-
B.
- Disable the paging space with the chps command, reboot the system
and remove the paging00 logical volume with the rmps command.
-
C.
- Disable the paging space with the chps command, remove the
paging00 logical volume with the rmps command, and reboot the system.
-
D.
- Disable the paging space with the chps command, reboot the system
and remove the paging00 logical volume with the rmlv command.
- Company ABC has sent a technical specialist to a customer site in
response to a complaint about slow system performance . The technical
specialist verified unusually slow performance on the customer's system, and is
attempting to find the source of the problem using the vmstat command.
Given the output of the vmstat command below, what is the most likely
cause of the performance problem?
kthr memory page faults cpu
----- ----------- ------------------------ ------------ -----------
r b avm fre re pi po fr sr cy in sy cs us sy id wa
0 0 5311 48642 0 0 0 0 0 0 102 4 11 0 0 99 0
0 1 52197 1756 0 0 0 0 0 0 206 157 26 28 12 0 60
0 1 51192 2751 0 0 0 0 0 0 204 24 22 22 12 0 66
-
A.
- High user process activity
-
B.
- Excessive system paging
-
C.
- Poor disk drive I/O response time
-
D.
- Excessive system CPU interrupts
- A system administrator runs the vmstat command due to system
performance problems. The output of vmstat is shown. What can be
concluded from this output?
kthr memory page faults cpu
----- ----------- ------------------------ ------------ -----------
r b avm fre re pi po fr sr cy in sy cs us sy id wa
2 0 9200 11027 0 0 0 0 0 0 103 52 14 44 46 9 0
2 1 9200 11027 0 0 0 0 0 0 207 251 29 45 45 9 0
3 1 9200 11027 0 0 0 0 0 0 207 120 29 46 47 7 0
5 1 9200 11027 0 0 0 0 0 0 206 120 29 43 55 2 0
4 1 9200 11027 0 0 0 0 0 0 207 131 32 49 48 3 0
-
A.
- The CPU is not sufficient for the load.
-
B.
- The machine needs a memory upgrade.
-
C.
- The machine needs a FDDI card installed.
-
D.
- A user program is causing unnecessary paging.
- A system administrator is experiencing performance problems and runs the
vmstat command. The output of vmstat is shown. What can be concluded
from this output?
kthr memory page faults cpu
----- ----------- ------------------------ ------------ -----------
r b avm fre re pi po fr sr cy in sy cs us sy id wa
2 0 9200 11027 0 0 0 0 0 0 103 52 14 14 16 0 69
2 1 9200 11027 0 0 0 0 0 0 207 251 29 12 11 0 67
3 1 9200 11027 0 0 0 0 0 0 207 120 29 9 11 0 80
5 1 9200 11027 0 0 0 0 0 0 206 120 29 13 5 0 79
4 1 9200 11027 0 0 0 0 0 0 207 131 32 9 8 0 72
-
A.
- The machine is I/O bound.
-
B.
- The machine needs memory optimized.
-
C.
- The machine needs a FDDI card installed.
-
D.
- A user program is causing unnecessary paging.
- The system administrator for Company XYZ is monitoring a system that has
recently shown a decrease in performance. What is the best tool to identify
where a performance bottleneck may exist?
-
A.
- lsps
-
B.
- errpt
-
C.
- svmon
-
D.
- vmstat
- A system has a 128-port controller with 130 TTYs configured total for
the system and the terminal input and output is slowing down. The console is
exhibiting the same behavior. Systems support runs netstat,
vmstat and ps aux commands. Based on the outputs of these
commands, what needs to be done to remedy the problem?
# vmstat
kthr memory page faults cpu
----- ----------- ------------------------ ------------ -----------
r b avm fre re pi po fr sr cy in sy cs us sy id wa
0 0 9778 1262 0 0 0 0 0 0 161 72 32 10 15 75 0
0 0 9778 1261 0 0 0 0 0 0 171 161 38 11 20 69 0
0 0 9778 1261 0 0 0 0 0 0 162 119 32 11 20 69 0
0 0 9778 1261 0 0 0 0 0 0 163 119 32 12 20 68 0
0 0 9778 1261 0 0 0 0 0 0 164 120 33 11 20 69 0
# netstat
16 mbufs in use:
0 mbuf cluster pages in use
4 Kbytes allocated to mbufs
110 requests for mbufs denied
0 calls to protocol drain routines
0 sockets not created because sockthresh was reached
# ps aux
USER PID %CPU %MEM SZ RSS TTY STAT STIME TIME COMMAND
root 516 99.1 0.0 4 8 - A Jul 27 2851:18 kproc
root 14474 1.1 1.0 980 1180 - A 08:01:48 1:09 /usr/dt/bin/dtter
root 1032 0.2 0.0 316 232 - A Jul 27 6:51 kproc
root 2258 0.2 1.0 964 1148 - A 08:01:13 0:14 /usr/dt/bin/dtter
user1 2364 0.1 5.0 5468 4768 - A Jul 27 2:02 /usr/lpp/X11/bin/
root 5676 0.0 0.0 116 184 - A Jul 27 1:11 ./sapd
root 4154 0.0 0.0 84 96 - A Jul 27 0:53 /usr/sbin/syncd 6
root 0 0.0 0.0 8 12 - A Jul 27 0:31 swapper
root 4044 0.0 2.0 1808 2008 - A 08:00:43 0:01 dtwm
root 1 0.0 0.0 384 436 - A Jul 27 0:07 /etc/init
root 7740 0.0 1.0 980 1132 - A Jul 27 0:04 /usr/sbin/snmpd
root 774 0.0 0.0 12 16 - A Jul 27 0:03 kproc
user2 3376 0.0 0.0 432 428 - A Jul 27 0:02 /usr/dt/bin/dtlog
user2 8796 0.0 0.0 232 312 - A Jul 27 0:01 /usr/sbin/cron
root 7998 0.0 0.0 272 260 - A Jul 27 0:01 /usr/sbin/tftpd -
root 5196 0.0 1.0 456 532 - A Jul 27 0:01 /usr/bin/cnsview
imnadm 12132 0.0 2.0 1756 1808 - A Jul 27 0:00 /usr/IMNSearch/ht
-
A.
- Add another paging space.
-
B.
- Increase the value of the wall.
-
C.
- Increase the size of paging space.
-
D.
- Run kill -9 on PID of kproc process.
- A customer is experiencing performance problems and runs the
vmstat command. The output of vmstat is shown. What can be
concluded from this output?
kthr memory page faults cpu
----- ----------- ------------------------ ------------ -----------
r b avm fre re pi po fr sr cy in sy cs us sy id wa
1 0 9200 27 0 87 89 0 0 0 103 52 14 10 15 9 65
2 1 9200 22 0 136 122 0 0 0 207 251 29 9 12 8 71
3 1 9200 19 0 112 107 0 0 0 207 120 29 11 9 7 73
5 1 9200 17 0 99 122 0 0 0 206 120 29 12 8 8 72
-
A.
- The machine needs a CPU upgrade.
-
B.
- Another ATM card needs to be added.
-
C.
- The paging space needs to be optimized.
-
D.
- A user program is causing a system loop.
- A customer is experiencing performance problems and runs the
iostat command. The output of the iostat command is shown.
What should be recommended?
tty: tin tout avg-cpu: % user % sys % idle % iowait
0.0 170.2 7.1 12.1 0.8 80.0
Disks: % tm_act Kbps tps Kb_read Kb_wrtn
hdisk0 0.0 0.0 0.0 0 0
hdisk1 0.0 0.0 0.0 0 0
cd0 55.9 622.4 155.6 1250 8
tty: tin tout avg-cpu: % user % sys % idle % iowait
0.0 170.2 5.1 14.1 0.8 80.0
Disks: % tm_act Kbps tps Kb_read Kb_wrtn
hdisk0 0.5 2.0 0.5 4 0
hdisk1 0.0 0.0 0.0 0 0
cd0 55.9 622.4 155.6 1270 0
-
A.
- A user program needs optimizing.
-
B.
- Another ATM card needs to be added.
-
C.
- The CD-ROM needs to be removed from the configuration.
-
D.
- Space permitting, the volume mounted on the CD-ROM should be moved to a
disk.
9.3.4 References
9.5 Exercises