How to create a "dump" device

[littlejohnny]

Dumb question---How do I create a dump device
on my hard drive?

Thank you!!

 

[aixqueen]

Best document is

http://techsupport.services.ibm.com...mode=9&documents=390605210214768&database=aix

How to create a dedicated dump device

1.View an estimate of the dump size, enter:
sysdumpdev -e
You should see information similar to the following:
0453-041 Estimated dump size in bytes: 25103360

2.View the PP size, enter:
lsvg rootvg

You should see information similar to the following:
VOLUME GROUP: rootvg VG IDENTIFIER: 0000003173650c77
VG STATE: active PP SIZE: 4 megabyte(s)
VG PERMISSION: read/write TOTAL PPs: 479 (1916 megabytes)
MAX LVs: 256 FREE PPs: 258 (1032 megabytes)
LVs: 11 USED PPs: 221 (884 megabytes)
OPEN LVs: 10 QUORUM: 2
TOTAL PVs: 1 VG DESCRIPTORS: 2
STALE PVs: 0 STALE PPs 0
ACTIVE PVs: 1 AUTO ON: yes

3.Determine necessary number of PPs (physical partitions). Divide the estimated
size (sysdumpdev -e), by the PP size to estimate the proper number of PPs
that the dump logical volume should have.

4.Determine where you have free PPs, enter:

lsvg -p rootvg

You should see information similar to the following:
rootvg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk1 active 479 258 78..02..00..82..96
hdisk2 active 159 0 00..00..00..00..00
hdisk3 active 75 8 00..00..00..00..08

NOTE: You should use the hdisk with the highest number of free PPs (in this example hdisk1).
5.Create a LV, enter:

mklv -y dumplv -t sysdump rootvg 7 hdisk1dumplv

6.Set LV as the dump device, enter:

sysdumpdev -Pp /dev/dumplv

You should see information similar to the following:

primary /dev/dumplv
secondary /dev/sysdumpnull
copy directory /var/adm/ras
forced copy flag TRUE
always allow dump FALSE

7.Change always allow dump to TRUE, enter:

sysdumpdev -K

8.Verify that the flag has been changed, enter:

sysdumpdev -l

You should see information similar to the following:

primary /dev/dumplv
secondary /dev/sysdumpnull
copy directory /var/adm/ras
forced copy flag TRUE
always allow dump TRUE

 

[littlejohnny]

Thank you!