LDOM Interview Questions and Answers

Please Refer LDOM Quick Reference Guide 

 

 

1. How to check the Version of Logical Domain Manager and Hypervisor ?

# ldm -V     Display version information of LDM and Hypervisor

 

2. Brief about Primary/Control Domain ?

 

It Controls the Oracle VM and also called as Primary domain.

Used to configure server resources and guest domains and Provides virtual console services.

Logical domain Manager installed only on Control domain.

Control domain normally act as Service domain.

For more reference "How to Configure Primary or Control Domain." 

3. Brief about Service Domain?
Service domain Provides virtual device services to Guest Domain.

It provides Virtual Disk Services.

It provides Virtual Console Services.

It provides Virtual network Switches.

For more reference "How to Configure Service Domain"

4. Brief about Guest/Logical Domain?
 Guest domain uses only virtual services.

• Guest domain where our OS is installed.
• Get the services from service domain in order to run application and user services.
• Guest domain can be a I/O Domain.
• For more reference "How to Configure Logical/Guest Domain"

5. Brief about I/O domain ?

• I/O Domain where we are getting phyiscal I/O device access directly.
• I/O device which connects PCI bus, such as local network interface, disk drives and PCI adapters.
• For more reference "How to Configure I/O Domain"

6. How to check the list of services ?

List the Virtual services currently configure in the Control Domain
Syntax : # ldm list-services  [-e] [-p] [...]
# ldm list-services primary

7. How to backup the LDOM configuration and how to restore?

Syntax : # ldm list-constraints ([-x] | [-e] [-p]) [...] # ldm list-constraints -p
VERSION 1.5
DOMAIN|name=primary
UUID|uuid=f44b4e9e-330c-4a20-c22e-a18c1c6f61b1
MAC|mac-addr=00:14:4f:82:5c:ee
CONTROL|failure-policy=ignore
CORE|count=2
VCPU|count=8
MAU|count=1
MEMORY|size=2147483648
VARIABLES
|keyboard-layout=US-English
IO
|dev=pci@780|alias=
|dev=pci@7c0|alias=
VCC|name=primary-vcc0|port-range=5000-5100
VSW|name=primary-vsw0|mac-addr=|net-dev=e1000g0|dev=switch@0|default-vlan-id=1|pvid=1|vid=|mode=|mtu=|linkprop=|id=0
VDS|name=primary-vds0
[root@unixrock /]#
[root@unixrock /]# ldm list-constraints -x primary > /unixrock.xml
[root@unixrock /]# file /unixrock.xml
primary.xml:    XML document
[root@unixrock /]# ls -l /unixrock.xml
-rw-r--r--   1 root     root        3988 Feb 17 14:26 unixrock.xml
[root@unixrock /]#

To restore the configuration NOTE: System configuration should be Factory-default setting

[root@unixrock /]# ldm list-spconfig
factory-default (current)
[root@unixrock /]# ldm init-system -i /unixrock.xml
[root@unixrock /]# ldm add-spconfig unixrock_config
[root@unixrock /]# ldm list-spconfig
factory-default
unixrock_config (current)
[root@unixrock /]#

8. How to check the list of available devices ?

Syntax : # ldm list-devices [-a] [-p] [core] [cpu] [crypto|mau] [memory] [io] 
Example : # ldm list-devices -a               To list all the host server resources details
Example : # ldm list-devices -a cpu         To list all the host server CPU resources 
Example : # ldm list-devices -a memory To list all the host server MEMORY resources 
Example : # ldm list-devices -a io            To list all the host server I/O resources
9. How to add and remove the LDOM ?

Syntax :  # ldm  list-domain [-e] [-l] [-o ] [-p] [...]
Syntax :  # ldm add-domain (-i |[mac-addr=] [hostid=][failure-policy=][master=] ...)
Syntax :  # ldm remove-domain (-a | ...)

[root@unixrock /]# ldm list-domain
NAME             STATE      FLAGS   CONS    VCPU  MEMORY   UTIL  UPTIME
primary          active     -n-cv-  SP      8     8G       0.4%  4h 7m
[root@unixrock /]#
[root@unixrock /]# ldm add-domain rockldom1
[root@unixrock /]# ldm list-domain
[root@unixrock /]#
NAME             STATE      FLAGS   CONS    VCPU  MEMORY   UTIL  UPTIME
primary          active     -n-cv-  SP      8     8G       0.4%  4h 7m
rockldom1       inactive    ------ 
[root@unixrock /]#
[root@unixrock /]# ldm remove-domain rockldom1
[root@unixrock /]#

10. How to start and stop the LDOM ?

Syntax :- # ldm start-domain (-a | -i | ...) 
Syntax :- # ldm stop-domain [-f] (-a | ...)

[root@unixrock /]# ldm start-domain rockldom1
LDom rockldom1 started
[root@unixrock /]# ldm stop-domain rockldom1
LDom rockldom1 stopped
[root@unixrock /]# 

11. How to migrate the LDOM to another Host?

NOTE: Source and Target service configuration should be same.
Syntax :- # ldm migrate-domain [-f] [-n] [-p ] [@][:]

[root@unixrock /]# ldm migrate-domain ldom1 root@192.168.10.25 
Target Password:

12. How to add/set the Memory resources to the LDOM ?

To add the memory to the guest domain
Syntax : # ldm add-memory [--auto-adj] [GMK]
           Example : # ldm add-memory 2G ldom1 
To reconfigure the memory to the guest or primary domain
Syntax : # ldm set-memory [--auto-adj] [GMK]
           Example : # ldm set-memory 5G primary 
           Example : # ldm set-memory 2G ldom1 
To decrease the amount of memory in a domain
Syntax : # ldm remove-memory [--auto-adj] [GMK]
            Example : # ldm remove-memory 1G primary 
            Example : # ldm remove-memory 1024M ldom1

13. How to dump the configuration to the SP ?
Syntax : # ldm list-spconfig [-r []]
             Example : # ldm list-spconfig 
Syntax : # ldm add-spconfig [-r ]
             Example : # ldm add-spconfig config_initial 
Syntax : # ldm remove-spconfig [-r]
             Example : # ldm remove-spconfig config_initial 

[root@unixrock /]# ldm list-spconfig
factory-default
tempprofile [current]
[root@unixrock /]# ldm remove-spconfig tempprofile
[root@unixrock /]# ldm list-spconfig
factory-default [next poweron]
[root@unixrock /]# ldm add-spconfig config_intial
[root@unixrock /]# ldm list-spconfig
factory-default
config_intial [current]
[root@unixrock /]#
[root@unixrock /]# 

14. How to set the LDOM variables ?

To list the Variable settings of guest domain
Syntax : # ldm list-variable [...]
       Example : # ldm list-variable auto-boot\? Ldom1
       Example : # ldm list-variable boot-device Ldom1
To add the new variable setting to the guest domain
Syntax : # ldm add-variable =...
       Example : # ldm add-variable boot-device Ldom1
To set the "auto-boot" variable as false, this will leave the server at in OK prompt 
Syntax : # ldm  set-variable =...
       Example : # ldm set-variable auto-boot\?=false Ldom1

15. How to add the VCC on primary domain ?

To add the Virtual console concentrator service to the control domain
Syntax : # ldm add-vconscon port-range=-
      Example : # ldm add-vconscon port-range=5000-5100 primary-vcc0 primary
To set or modify the Virtual console concentrator service to the control domain
Syntax : # ldm set-vconscon port-range=-
      Example : # ldm set-vconscon port-range=5000-5100 primary-vcc0
To remove the Virtual console service from domain
Syntax : # ldm remove-vconscon [-f]
      Example : # ldm remove-vconscon primary-vcc0


16. How to add/set/remove the virtual CPU to the domain?

To add CPU to the guest domain
Syntax : # ldm add-vcpu [-c|--core]
     Example : # ldm add-vpcu 8 ldom1
To reconfigure the virtual CPU for any domain 
Syntax : # ldm set-vcpu [-c|--core]
     Example : # ldm set-vpcu 10 primary
To decrease the number of virtual CPU for any domain 
Syntax : # ldm remove-vcpu [-f|--force] [-c|--core]
     Example : # ldm remove-vpcu 2 ldom1

17. How to add/remove the Virtual disk to the domain?

To assign the Virual disk to the guest domain
Syntax :# ldm add-vdisk [timeout=] [id=]    @
      Example : # ldm add-vdisk vdisk0 vol0@primary-vds0 ldom1
      Example : # ldm add-vdisk iso01 iso01@primary-vds0 ldom1
To remove the  Virual disk  on the guest domain
Syntax :# ldm remove-vdisk [-f]
      Example : # ldm remove-vdisk vdisk0 ldom1

18. How to add/remove the ISO image to the domain?
To add or associating the iso resources to the Control domain's virtual disk services  

[root@unixrock /]# ldm add-vdsdev options=ro /export/home/solaris.iso iso01@primary-vds0
[root@unixrock /]#

To remove Virtual disk server devices

[root@unixrock /]# ldm remove-vdsdev iso01@primary-vds0
[root@unixrock /]#

19. How to add the vds services to the domain?

To add the Virtual disk Server services

Syntax : # ldm add-vdiskserver

       Example : # ldm add-vdiskserver primary-vds0 primary

       Example : # ldm add-vds primary-vds0 primary

To remove the Virtual disk Server services

Syntax : # ldm remove-vdiskserver [-f]

       Example : # ldm remove-vds primary-vds0

20. How to add/remove Virtual Network services LDOM ?

To add virtual network device which is associated with the virtual switch  to the guest domain

Syntax : # ldm add-vnet [mac-addr=] [mode=hybrid] [pvid=] [vid=] [mtu=] [linkprop=phys-state][id=]

       Example : # ldm  add-vnet vnet0 primary-vsw0 ldom1

To remove the Virtual network device

Syntax : # ldm remove-vnet [-f]

       Example : # ldm  remove-vnet vnet0  ldom1

 

21. How to add/remove Virtual Switch on the domain ?

To add the virtual switch services 
Syntax : # ldm  add-vswitch [default-vlan-id=] [pvid=] [vid=][mac-addr=] [net-dev=] [linkprop=phys-state][mode=] [mtu=] [id=]
       Example : # ldm add-vswitch net-dev=e1000g0 primary-vsw0 primary
To remove the virtual switch services
Syntax : # ldm remove-vswitch [-f]
       Example : # ldm remove-vswitch primary-vsw0 

22. How to add/remove Virtual disk server device (vdsdev) ?

To add or associating the resources to the Control domain's virtual disk services
Syntax : # ldm add-vdiskserverdevice [-f] [options={ro,slice,excl}] [mpgroup=] @
      Example : # ldm add-vdsdev /dev/dsk/c0t1d0s2 vol01@primary-vds0
      Example : # ldm add-vdsdev options=ro /export/home/solaris.iso iso01@primary-vds0
To remove Virtual disk server devices
Syntax : # ldm  remove-vdiskserverdevice [-f] @
      Example : # ldm remove-vdsdev vol01@primary-vds0
      Example : # ldm remove-vdsdev iso01@primary-vds0

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