Kernel rebuild problem

[Paddy O'Connell]

Hi, i made some changes and rebuild a kernel and on reboot the system will not boot.

Server is HPUX 11i on a RP5405

i get the below error.

Boot
: disk(0/0/1/1.2.0.0.0.0.0;0)/stand/vmunix
disk(0/0/1/1.2.0.0.0.0.0;0)/stand/vmunix: cannot open, or not executable

i modified the maxusers from 32 to 64, to basicially increase the nproc value which is a forumla of maxusers.

If i boot hpux -is i get the same as above

If i boot hpux /stand/vmunix.prev i get the same as above as well.

Any ideas how i can get this back?

Thanks
Paddy

[Hanwant Verma_1]

In case of a bad kernel, reatrt the systme and wait for the following message

Processor is tarting the autoboot process.
To discontinue press a key within 10 seconds.

As soon as this message appears, press a key to enter the processor dependent code (PDC) menu.

Main Menu: Enter command or menu > boot pri
Iteract with ISL ( Y or N) ?> Y
ISL>

Now, at the ISL prompt use the hpux command to boot from the old kernel.

ISL> hpux /stand/vmunix.old

Thanks
Hanwant

[Robert-Jan Goossens]

Paddy,

Try to boot your system with "boot -lq"

Check

lvlnboot -r /dev/vg00/lvol1 (or whatever your root logical volume is)

lvlnboot -s /dev/vg00/lvol2 (or whatever your swap logical volume is)

lvlnboot -d /dev/vg00/lvol2 (or whatever your dump logicalvolume is)

lvlnboot -R -v /dev/vg00

shutdown -r

Regards,
Robert-Jan

[RAC_1]

Have ignite backups ready?? Looks like to time to re-install.

Froom isl prompt, can you do ls?

From pdc, does disk show up in sea ipl??

[Raj D.]

Paddy,

If at ISL > hpux /stand/vmunix.prev not working , try hpux -lq [ hope you have mirrored root disk]

Have u taken another backup of vmunix .. then u can try from that file..

hth,
Raj.

[Rajesh SB]

Hi,

While boot time enter the PDC and IPL.
From IPL just verify the existence of both kernels under stand.

ISL> hpux ll /stand

Also verify the boot path is correct, any chance changed.

PDC> sear

Wish you good luck.

Regards,
Rajesh

[Trond Haugen]

Normally it's vmunix.prev from ISL
ISL> hpux /stand/vmunix.prev

In my view tuning the MAXUSERS is a very crude way of tuning the kernel. There is no knowing which other parameters are changed too. I ALWAYS reccomend having no equations in the system file and thus tuning only one paramter at a time.

Regards,
Trond

[Paddy O'Connell]

I've tried ISL> hpux /stand/vmunix.old but i get the same error.

i've done ser ipl from the PDC and can confirm it sees both disks and the paths are correct.

hpux -lq gives me the same error as above.

However i've found it will boot with hpux -lm, it did a dump and is rebooting now.

[Steven E. Protter]

I would next:

Try booting with a Core OS CD. You can try a recovery shell or just boot and see what the system looks like.

cd in drive

boot
interupt at 10 second prompt
sea

See if all the hardware is present

bo p6

if p6 is your cdrom, you can usually tell by the hardware path.

If that fails, it may be Ignite time.

SEP

[Hanwant Verma_1]

assign points please

hanwant

[Mahesh Kumar Malik]

Hi Paddy

Boot the server from backup copy of kernel

ISL>hpux /stand/vmunix.prev

Review the changes required and rebuild the kernel

Regards
Mahesh