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06-20-2002 09:38 AM
06-20-2002 09:38 AM
L2000 internal disk trick
frog has 4 drives and using LVM to mirror disk A0 to A1 and B0 to B1. toad is a new system with all its 4 drives new/unused. what would be the procedure to break the 2 mirrors on frog and use A1 and B1 from frog on toad? then, of course, rebuild both mirros on frog and toad (then change netconf on toad before putting it on the network)
is it possible to do without taking frog offline?
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06-20-2002 10:02 AM
06-20-2002 10:02 AM
Re: L2000 internal disk trick
The hardware paths will have to match for this to work.
Paula
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06-20-2002 10:23 AM
06-20-2002 10:23 AM
Re: L2000 internal disk trick
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06-20-2002 10:58 AM
06-20-2002 10:58 AM
Re: L2000 internal disk trick
# lvreduce -m 0 /dev/vg00/lvol2 /dev/dsk/c2t2d0
==> Repeat for all LVs.
# lvlnboot -v
==> Check.
# vgreduce vg00 /dev/dsk/c2t2d0
# lvlnboot -v
==> Check again.
If it's a data disk you would just do the "lvreduce" and "vgreduce". That's it as far as breaking the mirror (and you can do this while the system is running).
I've done a lot of vgexport/vgimport , moving data disks around but not this scenario that you're trying to do I can't really confirm if it'll work since I have not try it before. However in theory (after the above sre done), you should be able to physically disconnect drive A1 and plug it onto toad (keep all hrw path the same), boot up toad using A1 in LVM maintenance mode ..
ISL> hpux -lm
then activate it ..
# vgchange -a y /dev/vg00
Now mount the appropriate LV onto the FS and make your changes (eg : the netconf file that you've mentioned earlier).
Having said all that I would prefer going the Ignite route just to be cleaner.
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06-20-2002 11:08 AM
06-20-2002 11:08 AM
Re: L2000 internal disk trick
It is possible thje way you are suggesting , but I would defiantley witch off the system once i remove the disk. The better and safer way woulb be to do ignite the other server.
Manoj Srivastava
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06-20-2002 11:15 AM
06-20-2002 11:15 AM
Re: L2000 internal disk trick
Ignite would take care of this with an interactive boot.
HTH
Marty
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06-20-2002 11:21 AM
06-20-2002 11:21 AM
Re: L2000 internal disk trick
You can try this procedure to create a copy of the root disk without using mirror/ux or ignite. You can then move the copy to the other server and try to boot that system using the disk. You can try this without shuttting down the system provided the disks are hot-swappable. Try this link,
http://support1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000058668933
Hope this helps.
Regds
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06-20-2002 11:23 AM
06-20-2002 11:23 AM
Re: L2000 internal disk trick
I would prefer doing this thro Ignite since you will have to take lot of precuations in the method which you are trying to do. You may end messing up both the systems since one command here and there.......
Once you bring up your Toad server, you have to keep the Frog switched off since the IP address of both the servers will be the same. And you need to change the IP of the Toad and then boot up the Frog.
Piyush
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06-20-2002 01:26 PM
06-20-2002 01:26 PM
Re: L2000 internal disk trick
If you miror split & remirror, the VGID's for vg00 on the frog & toad will be the same.!!!! If the machines are to be put in ServiceGuard it will confuse the hell out of it, and it will "deduce" (incorrectly) that the root disks are indeed the same (it reads the VGID from each computer & compares notes). At this point it may barf or continue. It may well work, with the above warning.
What is wrong with IgniteUX, it is pritty quick & by the time you've fiddled 'round with disks etc you will probably not save much time.
But then again if you do not experiment you might not learn.... If you do do it, post the results please
Regards
Tim
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06-20-2002 04:13 PM
06-20-2002 04:13 PM
Re: L2000 internal disk trick
all 4 disks are in vg00 and have no other VGs. so my game plan so far is:
1) lvreduce all LVs
2) vgreduce disks A1 and B1
3) pull out A1 and B1 ...frog should still be online and users unaware
4) place these 2 disks in the exact same slots on toad and take the 2 removed disk from toad and place in frog
5) run ioscan then do the LVM stuff to get frog back to being mirrored
pvcreate, vgextend, lvextend, lvlnboot
6) disconnect toad from the network and boot system
no need to do "hpux -lm" ...i think
7) repeat step 5 for toad
8) edit netconf file and reboot
will plug into the network after verify that toad boots up OK
anything look incorrect?
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06-21-2002 06:06 AM
06-21-2002 06:06 AM
Re: L2000 internal disk trick
Tim
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07-05-2002 06:34 AM
07-05-2002 06:34 AM
Re: L2000 internal disk trick
1) was able to steps 1-> 5 OK
so frog, my online machine is OK
2) stuck rebuilding vg00 on toad
cannot get vg00 to activate!
i put A1 and B1 from frog into the exact same slots on toad. A0 and B0 on toad are empty/new drives. when i boot via "hpux -lm" all is OK until i try to do a "vgchange -a y -q n vg00".
it seems that doing the "vgreduce" on these disks when they were on frog has messed up some of the LVM metadata on these disks. any tricks from here? want to ask before trying to do a vgimport or vfcfgrestore ... i do not have a vgexport file but do have a /etc/lvmconf/vg00.conf
any help would be great, else i have to conclude that this procedure is not valid ...unless there are steps i could of done better on frog to prepare these A1 and B1 disks for use on toad.
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07-05-2002 06:38 AM
07-05-2002 06:38 AM
Re: L2000 internal disk trick
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07-05-2002 12:44 PM
07-05-2002 12:44 PM
Re: L2000 internal disk trick
if booting from PDC
ISL> hpux -lq
If activating it
# vgchange -q n -a y vg00
Both these activate in "lost quorum" mode, Hope this helps
Tim
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07-07-2002 08:40 PM
07-07-2002 08:40 PM
Re: L2000 internal disk trick
i am aware of quorum and have done all the right stuff to ignore quorum and it still will not activate.
....just wondering if the lvreduce and/or the vgreduce on these drives when they were on frog has messed up some of the LVM metadata on them.
so it looks like my trick is not one at all. one last thing i was thinking of doing was recreate vg00 on toad while in "hpux -lm" mode, and using the same LE to PE mappings when building the LVs. maybe by recreating the LVM metdata from scratch i can get by!?!