Confusion between crash dump and swap area

[Berd]

I have a couple of boxes where disk space is at a premium. On these boxes I have a filesystem, /dev/vg00/crash, which is rather large. If I run a crashconf command this filesystem is not listed as a dump device ?

Does the dump device require configuration, would editing /etc/rc.config.d/savecrash be sufficient to point to this dump area ?

Any thoughts,

Berd

[Berd]

Is the dump area the inital point where the crash dump is stored, and then it is moved to the location listed in savecrash at reboot ?

[Chan 007 · Accepted solution]

Bred,

Just do a man on "lvlnboot" you will get complete details, I just did a cut paste of dump info for you.

Create a logical volume that will be used as the dump volume.
This volume should be contiguous.

lvcreate -n dump -L 64 -C y /dev/vglvmroot

Specify that the logical volume, root, will be used as the root
volume.

lvlnboot -r /dev/vglvmroot/root

Specify that the logical volume, boot, will be used as the boot
volume.

lvlnboot -b /dev/vglvmroot/boot

Specify that the logical volume, swap, will be used as the
primary swap.

lvlnboot -s /dev/vglvmroot/swap

Specify that the logical volume, dump, will be used as the dump
volume.

lvlnboot -d /dev/vglvmroot/dump

Display the results of the previous operations.

lvlnboot -v /dev/vglvmroot

The following example shows configuration of multiple dump volumes.

Specify that logical volumes /dev/vg00/swap1, /dev/vg00/dump2, and
/dev/vg00/dump3 should be used as the dump logical volumes and that
/dev/vg00/swap1 should also be used as primary swap. Assume that the
volume group and the logical volumes have been created and the logical
volumes are contiguous.

lvlnboot -s /dev/vg00/swap1
lvlnboot -d /dev/vg00/swap1
lvlnboot -d /dev/vg00/dump2
lvlnboot -d /dev/vg00/dump3

On your second question, Yes, it will move from dump area to the /var/adm/crash

Chan

[Berd]

Thanks Chan,

So crashconf -v will only show me the dump area. In order to confirm the save area I need to look at /etc/rc.config.d/savecrash.

Is that correct ?

[Chan 007]

Hi Bred,

Just do a lvlnboot -v

That will display the boot, dump and swap information.

As mentioned, unless you set the parameters in /etc/rc.config.d/ both crashconf and savecrash.

and ensure that you have /var/adm/crash created.

Chan

[Berd]

Thanks Chan,

I am aware of how to setup the boot/dump/swap areas, but I was unsure as to how to translate the output from crashconf.

Crashconf display dump areas only, not saved dump areas.

Cheers,
BErd