Additional dump device creation failure

[sudheer_7]

Hi,

I was trying to create an additinal dump device on a 11i server. While trying to add it using crashconf -a I am getting the following error

crashconf -a
/dev/vg00/dump1: error: device is fully occupied by a file system

I have not created any filesystem on dump1. Following are the steps I did.

lvcreate -n dump1 -C y -r n /dev/vg00/dump1
lvextend -l 1650 /dev/vg00/dump1 /dev/dsk/c7t2d0

lvlnboot -d /dev/vg00/dump1

Added to /etc/fstab
/dev/vg00/dump1 ... dump defaults 0 0

crashconf -a

Thanks in advance,

Sudheer

[Sameer_Nirmal]

Hi,

Check using
# fstyp -v /dev/vg00/rdump1
you probably would see it has a FS. "crashconf -a" and "lvlnboot" as well won't work in such case.

As you are trying to add "additional" dump device, you should either use "lvlnboot -d" ( as you are adding in root vg ), reboot or use "crashconf -a" ( allows outside root vg device) to add on fly.

Be aware you may need to add "dump lvol" entry in the kernel if doesn't exist already.
# strings /stand/vmunix | grep "dump lvol"
If it is not there , then add "dump lvol" in /etc/system, rebuild kernel and reboot.

Refer manpages of lvlnboot and crashconf.

[Sameer_Nirmal]

Hi again,
Wanted to add..

You can use dd command to wipe out the FS header/metadata from the dump1 lvol.

[Tvs]

Hi sudheer,

after these steps try

#lvlnboot -R ( just we trying update the Label File )

and take a copy of the kernel using the system_prep command and just check what is the entry in the file along with Dump parameter. if any change required change it

example : dump dump1

and create the new kernel and reboot it .

regards

Tvs

[sudheer_7]

Thank you guys.

lvlnboot -v was showing the dump1 lvol also. But I was getting error on crashconf. fstyp was showing FS information, even though I have not created any file system on this lvol. I tried removing the lvol and recreating the same. but it was of no use.
dump lvol was there in kernel.

Finally what I did is, since this disk is used only as the dump device did a mediainit, followed the same steps in my original query, and it is showing in crashconf also.

Thanks for throwing the light.

Sudheer

[Devender Khatana]

Hi,

The contents of previously used PVs in LVM are not overwritten if the new structure is created with similar parameters. This was probably the reason for this to happen. The disk was there in use earlier with LVM either on same of different system causing the LVM file system to appear without being created.

You would have been even surprised to see some data there if the file system was mounted.

Have a look at this interesting thread discussing this issue


http://forums1.itrc.hp.com/service/forums/questionanswers.do?threadId=1001334

HTH,
Devender

[sudheer_7]

Hi Devender,

Thanks for the information. I was unable to access the link you provided

regards,
Sudheer

[Raj D.]

Sudheer ,

You can also get good information in "Recovery Handbook" in Chapter: Configuring Dump devices. I dont remember the chapter no# right now.


hth,
Raj.

[Devender Khatana]

Hi Sudheer,

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1001334

In fact there was some problem with the earlier posting.

Best Regards,
Devender