Ive set up mirroring with the rootvg using the isntructions here:

http://ramses.smeyers.be/varia/aix/mirrorrootvg/

however now after reading:

http://www.ahinc.com/aix/logicalvol....GICAL%20VOLUME

I see i have done it slightly differently, to this method. Ive never
mirrored anything in AIX before, and find the documentation a little
bit "sparse" to say the least. Previous to finding this second
article, i had yanked one fo the mirrors, with the intention of
finding out how to replace a failed disk.

Loss of information at this time isnt particularily critical, aas the
machine is just a test, but now in that second article basically i
read :

To protect against this, the Mirror Write Consistency Cache was
developed to write a record to the disk each time a mirrored write is
in progress, so that when the system is rebooted, a record will show
that possible inconsistencies may exist, and the data from the first
physical partition is rewritten to all other physical partition
copies.

That means if i pulled hdisk0 it will revert to the data previous to
pulling the disk?

also, commands like restart, halt ect dont work, cos of permission
errors, and stuff like shutdown is missing. Does this mean the disks
werent synched correctly, or is there something else i should do?

If the disk i pulled has older data, does the autosync give the choice
of which to use? If not is there a way to get it to use the one it is
currently running off?

What should i do here. Power off and put the disk back in?




# lsvg -l rootvg
0516-034 : Failed to open VG special file. Probable cause
is the VG was forced offline. Execute the varyoffvg and varyonvg
commands to bring the VG online.#