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Re: Mirror Reconfiguration

 
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Massimo Bianchi
Honored Contributor

Re: Mirror Reconfiguration

Hi,
to be more explicit,
simply:

vgextend vg03 /dev/dsk/c9t... (the new disk)

and do not use the vgreduce, you do not need it, you will keep both of the controller :)

And it is absolutely safe to do it online, now, without waiting the the weekend.


Massimo

Ian Dennison_1
Honored Contributor

Re: Mirror Reconfiguration

Hi Massimo,

Correction: Its a max of 8 alternate paths (1 primary, 7 alternate). Ian

PS. Race you to the crown! :)
Building a dumber user
Massimo Bianchi
Honored Contributor

Re: Mirror Reconfiguration

Hi Ian,
we are head to head !

I think that this is truly amazing game... and both of us will win :)


PS thank for the upgrade to the number of PV links..


Massimo
Jose Mosquera
Honored Contributor

Re: Mirror Reconfiguration

Hi guys,

Our final objective is to bet for the biggest redundancy and availability possible with the current resources (forget MC/ServiceGuard) although we sacrifice I/O reasonable performance, pls find attached a datailed .ppt file that show you a final redundancy configuration scheme.

Both vg's will be define a lot of Sybase-12 raw lvols (at least 22 lvols). Of course we are doing this on a L3000-5x under HP-UX 11.0

Any suggestion about will be appreciated!

Tim D Fulford
Honored Contributor

Re: Mirror Reconfiguration

Hi, comming in late

The above ppt look fine. IF say 0/3/0/0 goes you loose JUST mirrors from vg03 & 04. similarly if 0/1/0/0 goes you loose original.

I WOULD however alternate the paths, so use c10t8d0 as primary for vg03, but c9t14d0 as primary for vg04.

What (generally) happens is that writes to mirrored pairs cause equal IO to each disk, BUT reads will only go to one (generally the original), hence this causes one disk to be more active than the other. Thus alternating these disks will even out the IO over the two controlers.

Regards

Tim
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Ian Dennison_1
Honored Contributor

Re: Mirror Reconfiguration

Your diagram does not indicate which is the primary disk and which is the mirror disk.

You should put each primary disk on a different controller, so that the load is balanced as best it can be.

Share and Enjoy! Ian
Building a dumber user
Jose Mosquera
Honored Contributor

Re: Mirror Reconfiguration

Hi again,

Primary disks:
c10t8d0
c10t12d0

How can I force that c9t14d0 as primary disk?

regards
Ian Dennison_1
Honored Contributor

Re: Mirror Reconfiguration

vgextend /dev/vg03 /dev/dsk/c9t14d0
vgreduce /dev/vg03 /dev/dsk/c10t8d0 /dev/dsk/c10t12d0
vgextend /dev/vg03 /dev/dsk/c10t8d0 /dev/dsk/c10t12d0

This will add the disk in, then remove and add back in the previous disks (as alternates instead of primarys)

Share and Enjoy! Ian
Building a dumber user
Jose Mosquera
Honored Contributor

Re: Mirror Reconfiguration

Ooopsss,

I'll repeat the situation more detailed:

Primary disks:
c10t8d0 in vg03
c10t12d0 in vg04

How can I force/change that c9t14d0 in vg04 as primary disk?

regards.
Ian Dennison_1
Honored Contributor

Re: Mirror Reconfiguration

Same commands as above, but don't include c10t8d0 in the vgreduce and vgextend, just c10t12d0.

Share and Enjoy! Ian
Building a dumber user