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тАО07-04-2003 12:21 AM
тАО07-04-2003 12:21 AM
Re: Mirror Reconfiguration
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
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тАО07-04-2003 12:21 AM
тАО07-04-2003 12:21 AM
Re: Mirror Reconfiguration
Correction: Its a max of 8 alternate paths (1 primary, 7 alternate). Ian
PS. Race you to the crown! :)
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тАО07-04-2003 12:24 AM
тАО07-04-2003 12:24 AM
Re: Mirror Reconfiguration
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
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тАО07-04-2003 03:50 AM
тАО07-04-2003 03:50 AM
Re: Mirror Reconfiguration
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!
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тАО07-04-2003 04:06 AM
тАО07-04-2003 04:06 AM
Re: Mirror Reconfiguration
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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тАО07-04-2003 04:08 AM
тАО07-04-2003 04:08 AM
Re: Mirror Reconfiguration
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
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тАО07-04-2003 04:28 AM
тАО07-04-2003 04:28 AM
Re: Mirror Reconfiguration
Primary disks:
c10t8d0
c10t12d0
How can I force that c9t14d0 as primary disk?
regards
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тАО07-04-2003 04:33 AM
тАО07-04-2003 04:33 AM
Re: Mirror Reconfiguration
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
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тАО07-04-2003 04:42 AM
тАО07-04-2003 04:42 AM
Re: Mirror Reconfiguration
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.
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тАО07-04-2003 04:44 AM
тАО07-04-2003 04:44 AM
Re: Mirror Reconfiguration
Share and Enjoy! Ian