bootable mirror disk

[Sami Aqel]

We used a primary disk as system disk, then we add another disk as system mirror disk.
After both disks have the same data, how can we make the second disk a bootable one ?
we did not use mkboot command.

[Ravi_8]

Hi,

mkboot command while mirroring is required to put the bootable files in boot sector of the disk.

anyway try using setboot

#setboot -p
reboot

device can be get using ioscan -fnC disk it will in the form 0/0/........

[Sami Aqel]

Thanks .... the setboot command works fine, but what those commands means ?


# mkboot /dev/rdsk/c2t2d0
There appear to be non-boot logical volumes on this device.
Overwriting them could destroy all the data on this device
# would the logical volumes be overwritten [y/n]? #


# mkboot -a "hpux -lq (;0)/stand/vmunix" /dev/rdsk/c2t2d0
There appear to be non-boot logical volumes on this device.
Overwriting them could destroy all the data on this device
# would the logical volumes be overwritten [y/n]? #

[Stf · Accepted solution]

make sure that /dev/rdsk/c2t2d0 is your system mirror disk and answer yes to the questions...
It may erase your data on the disk so be carefull..
Normally "mkboot" commands are made before mirroring your system so I don't know what it will do if you make it after.
If answering yes cause the destruction of your mirror you just have to mirror again your logical volume...

Stf ;-)

[Ravi_8]

Hi,

mkboot before mirroring the boot disk is necessary to make that disk also bootable.

Now in your case, break the mirror, run the mediainit ( to format the disk, i don't it is necessary) and recreate the mirror. (use mkboot this time)

[Sami Aqel]

Thanks Stf and Ravi

[Sami Aqel]

Hi again.

How can i be sure that data is written on both mirrored disks ?

[Hoang Minh Tuan]

Hi Sami Agel,

You can check how data is written or not by command #lvsync mirrored_lv , if it synchronise, it mean that your data is mirroring between 2 disks.
Or you can check 2 your physical disks appear by command lvdisplay -v mirrored_lv_name.

HMT

[Suraj_2]

Hi

Hope while running the pvcreate , u have used -B option
This option is must to while making bootable disk. If not used the options, there will not be BDRA area in disk.


Rgds
Suraj

[Sami Aqel]

HMT,

The command #lvsync mirrored_lv , return :
Resynchronized logical volume "mirrored_lv_name".


Suraj,
i used this command to create pv
pvcreate -f /dev/rdsk/c2t2d0
option -B not used.

[nsjayasundar]

Dear Agel,

Please follow the steps while crearing the mirror root disk.

Create PV with -B option
#pvcreate -B (disk)

And then vgextend to vg00
#vgextend /dev/vg00 (disk)
then mkboot
#mkboot (disk)
#mkboot -a "hpux -lq (;0)/stand/vmunix" /dev/rdsk/c2t2d0


Then u do lvextend for each LV is in vg00 required for you.
#lvextend -m 1 /dev/vg00/lvol1 (disk)

Finally use #lvlnboot to update the vg00 group.

if the above step not followed, the system will not boot from the mirrored disk, even though it is mirrored.

Cheers