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test_000-221_-_aix_7_administration

~~TOC~~

Test 000-221 - AIX 7 Administration

  • Number of questions: 72
  • Time allowed in minutes: 90
  • Required passing score: 58%
  • Test languages: English

AIX 7.1 Information Center

System Availability (10%)

Identify resources used by Cluster Aware AIX

For the folling commands to work, you have to have bos.cluster installed and running them within a cluster environment.

Query status of nodes:

lscluster -m

Interface state:

lscluster -i -n 

Disk info and state:

lscluster -d

Run commands on all nodes:

clcmd ps -ef

Configure dump devices and analyze output

IBM documentation: Managing System Dump Devices

The sysdumpdev command changes the primary or secondary dump device designation in a system that is running. The primary and secondary dump devices are designated in a system configuration object. The new device designations are in effect until you run the sysdumpdev command again, or you restart the system.

It is not recommended that a standalone dump logical volume be mirrored. It is much better practice to have a primary and a secondary dump device, each wholly contained on separate hdisks, rather than mirroring these devices. If for some reason the primary dump device is inaccessible the dump program will then attempt to dump to the secondary device.

Show information

View information about primary and secondary dump device:

sysdumpdev -l

primary              /dev/lg_dumplv
secondary            /dev/sysdumpnull
copy directory       /var/adm/ras
forced copy flag     TRUE
always allow dump    TRUE
dump compression     ON
type of dump         traditional

Enable “always allow dump”:

sysdumpdev -k

Estimate size of dump for current running system:

sysdumpdev -e

0453-041 Estimated dump size in bytes: 798385766
Change dump device

Create a new LV and change the dump device

sysdumpdev -Pp /dev/dumplv
Start a dump and analyse

Start dump, reboot wil take place!

sysdumpstart -p

Shows dump date, time and size

sysdumpdev -L

0453-039

Device name:         /dev/lg_dumplv
Major device number: 10
Minor device number: 11
Size:                203220992 bytes
Uncompressed Size:   2208585577 bytes
Date/Time:           Tue Oct  8 13:27:09 CEST 2013
Dump status:         0
Type of dump:        traditional
dump completed successfully

Copy last dump from dump device

savecore -d /var/adm/ras

0481-183 Saving 203220992 bytes of system dump in /var/adm/ras/vmcore.0.BZ

Analyse dump:

dmpuncompress vmcore.0.BZ
-- replaced with vmcore.0

kdb /var/adm/ras/vmcore.0 /usr/lib/boot/unix_64

/var/adm/ras/vmcore.0 mapped from @ a00000000000000 to @ a00000083a45769
           START              END <name>
0000000000001000 00000000058A0000 start+000FD8
F00000002FF47600 F00000002FFDF9C8 __ublock+000000
000000002FF22FF4 000000002FF22FF8 environ+000000
000000002FF22FF8 000000002FF22FFC errno+000000
F1000F0A00000000 F1000F0A10000000 pvproc+000000
F1000F0A10000000 F1000F0A18000000 pvthread+000000
Dump analysis on CHRP_SMP_PCI POWER_PC POWER_4 machine with 4 available CPU(s)  (64-bit registers)
Processing symbol table...
.......................done
read vscsi_scsi_ptrs OK, ptr = 0x0
(0)> stat
SYSTEM_CONFIGURATION:
CHRP_SMP_PCI POWER_PC POWER_4 machine with 4 available CPU(s)  (64-bit registers)

SYSTEM STATUS:
sysname... AIX
nodename.. p630
release... 1
version... 7
build date May 10 2013
build time 11:15:39
label..... j2013_19C1
machine... 005FF6FD4C00
nid....... 5FF6FD4C
time of crash: Tue Oct  8 13:27:09 2013
age of system: 43 min., 59 sec.
xmalloc debug: enabled
FRRs active... 0
FRRs started.. 0

CRASH INFORMATION:
CPU -1 CSA 053A7E80 at time of crash, error code for LEDs: 00000000

(0)> 

Determine elements necessary to reduce single points of failure

  • Servers / nodes
  • Applications
  • Networks and interfaces
  • Disks and adapters

Understand geographical logical volume manager (GLVM)

IBM Documentation GLVM Overview

You can configure geographically mirrored volume groups in AIX® GLVM, without having to install and configure an HACMP™ cluster. The AIX GLVM technology provides the same geographic data mirroring functionality as HACMP/XD for GLVM, only without the automated monitoring and recovery which is provided by HACMP.

GLVM is intended for non-concurrent access only. In order to prevent accidental concurrent access, it is recommended that a geographically mirrored volume group not be automatically varied online during system startup.

The RPV device driver does not encrypt the messages that are sent between the RPV client and RPV server. IBM recommends the IP Security (IPsec) feature of AIX for network security.

Maintain hardware (CEC/Blade Hardware), deferred or concurrent firmware, AMM firmware (for Power Blades), whether an adapter replacement or new installation.

See hardware manuals and IBM Fix central for updates. IBM Fix central

Storage Management (21%)

Manage storage devices (traditional disk, Solid State Drives, and tape) including redundancy

Show disk size in MB, lspv only works if disk is in a volume group:

getconf DISK_SIZE /dev/hdisk0

Manage physical and virtual devices

The cfgmgr command configures devices and optionally installs device software into the system.

cfgmgr

Show physical devices:

lspv

hdisk0          005ff6fd4c672d8d                    rootvg          active      
hdisk1          005ff6fd44f62149                    datavg          active      
hdisk2          0042579a00041f31                    datavg          active      
hdisk3          005ff6fd8cc976b8                    rootvg          active

Create and manage volume groups

List volume groups:

lsvg

rootvg
datavg

Show volume group information:

lsvg rootvg
VOLUME GROUP:       rootvg                   VG IDENTIFIER:  005ff6fd00004c000000014185113848
VG STATE:           active                   PP SIZE:        128 megabyte(s)
VG PERMISSION:      read/write               TOTAL PPs:      1092 (139776 megabytes)
MAX LVs:            256                      FREE PPs:       962 (123136 megabytes)
LVs:                11                       USED PPs:       130 (16640 megabytes)
OPEN LVs:           10                       QUORUM:         1 (Disabled)
TOTAL PVs:          2                        VG DESCRIPTORS: 3
STALE PVs:          1                        STALE PPs:      1
ACTIVE PVs:         2                        AUTO ON:        yes
MAX PPs per VG:     32512                                     
MAX PPs per PV:     1016                     MAX PVs:        32
LTG size (Dynamic): 256 kilobyte(s)          AUTO SYNC:      no
HOT SPARE:          no                       BB POLICY:      relocatable 
PV RESTRICTION:     none                     INFINITE RETRY: no

List logical volumes within volume group:

lsvg -l rootvg

rootvg:
LV NAME             TYPE       LPs     PPs     PVs  LV STATE      MOUNT POINT
hd5                 boot       1       2       2    closed/syncd  N/A
hd6                 paging     4       8       2    open/syncd    N/A
hd8                 jfs2log    1       2       2    open/syncd    N/A
hd4                 jfs2       2       4       2    open/syncd    /
hd2                 jfs2       12      24      2    open/syncd    /usr
hd9var              jfs2       32      64      2    open/stale    /var
hd3                 jfs2       1       2       2    open/syncd    /tmp
hd1                 jfs2       1       2       2    open/syncd    /home
hd11admin           jfs2       1       2       2    open/syncd    /admin
lg_dumplv           sysdump    16      16      1    open/syncd    N/A
livedump            jfs2       2       4       2    open/syncd    /var/adm/ras/livedump

Create volume group datavg, pp size = 128MB with 2 disks:

mkvg -y datavg -s 128 hdisk1 hdisk2

Change volume group characteristics:

chvg

Add / remove physical volume to volume group:

extendvg vg3 hdisk3 hdisk8

reducevg vg01 hdisk1

Remove volume group:

varyoffvg
exportvg

Create and manage logical volumes

Create logical volume:

mklv -t jfs2 -y instimglv datavg 5000

Extend logical volume:

 extendlv testlv 8
 
 extendlv lv05 10M
 

Sync stale logical volume:

syncvg -l hd9var

Create and manage filesystems

Create file system:

crfs -v jfs2 -d instimglv -m /usr/sys/inst.images -A yes

Resize filesystem:

chfs -a size=20G /usr/sys/inst.images

System and Network Security (4%)

There are five (5) components to the RBAC security database:

  • Authorizations
  • Roles
  • Privileged Commands
  • Privileged Devices
  • Privileged Files

The predifined roles are:

  • The ISSO (Information System Security Officer) role manages all other roles. This makes it the most powerful role on the system.
  • SA - Systems Administrator
  • SO - System Operator

RBAC Tour

Configure Role Based Access Control

Create and assign role to user so that user can shutdown system. Create authorization:

mkauth shut_auth

Set security attributes

setsecattr -c accessauths=shut_auth /usr/sbin/shutdown

Create role

mkrole authorizations=shut_auth admin_role

Modify user

chuser roles=admin_role benst

Read security databases and load into the kernel

setkst

Test:

swrole admin_role
rolelist -e
/usr/sbin/shutdown -Fr

Configure and Manage remote access

Install OpenSSH?

Partition Management (11%)

Configure and manage Logical Partitions (LPARs), including DLPAR operations

Create and manage Workload Partitions (WPAR), including Versioned WPARs and planning for Live Application Mobility

Understand HMC, SDMC and IVM interfaces

Create and Manage VIO Server partitions (including working with virtual repositories)

Understand and explain LPAR and WPAR migration and mobility at a basic level

Performance Management and Tuning

Use performance monitoring tools, and plan for future growth

Analyze output from performance monitoring tools

Configure system tunables to support optimal application performance

Network Management (11%)

Configure network devices (including Etherchannel, IPv4, and IPv6)

Troubleshoot network issues

Configure TCP/IP, with and without VLAN support

System Management (18%)

Create, maintain and modify user accounts

Manage services and subsystems (using chtcp, etc)

Configure Electronic Service Agent

Configure the system and device attributes

Use AIX system management tools (for example: DSM, Director, NIM)

Install, apply, commit, or reject software

Create and manage paging space

Use Cron and At functions

Install and Manage AIX (11%)

Understand and manage AIX instance startup

Backup and restore AIX

Migrate WPARs from AIX 6 to AIX 7

Install AIX and use NIM environments

Install Versioned WPARs

General administrative tasks (7%)

Create and use ksh and Perl scripts at a basic level

Use AIX commands such as TAR, CPIO, DD, RPM, SAVEVGSTRUC, and explain their use

test_000-221_-_aix_7_administration.txt · Last modified: 2014/08/11 12:38 by admin