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тАО12-08-2010 07:55 AM
тАО12-08-2010 07:55 AM
Re: MIrroring Problem using lvextend: Striped mirrors are not supported
Lots of things are possible in Unix, but not all can be supported, for understandable reason.
We can sometimes only give advice and encouragement.
If you get stuck give me a call.
Terry Giblin
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тАО12-08-2010 08:36 AM
тАО12-08-2010 08:36 AM
Re: MIrroring Problem using lvextend: Striped mirrors are not supported
You cannot create striped logical volumes that are mirrored on a 11.11 box !(typically) This is one of the most significant LVM enhancements of HPUX 11iv3 and yes it does not work the other way as Terry said. Upgrade from v1 to v2 and then from v2 to v3. :)
> Giblin
What -d option! I suppose you are talking about another disk partitioning approach or another flavor of unix. If not, please let sysad1 know about it.
Regards
Ismail Azad
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тАО12-08-2010 11:04 AM
тАО12-08-2010 11:04 AM
Re: MIrroring Problem using lvextend: Striped mirrors are not supported
Lvcreate -d or -D, D.
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тАО12-08-2010 11:25 AM
тАО12-08-2010 11:25 AM
Re: MIrroring Problem using lvextend: Striped mirrors are not supported
>giblin,
"Extent based mirrored stripes". A -i has been done on these LVs obviously. The distributed allocation policy and -i don't go together. And yes it's a "mirrored stripe".
>sysad1 Upgrade to v3 . :)
Regards
Ismail Azad
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тАО12-08-2010 05:42 PM
тАО12-08-2010 05:42 PM
Re: MIrroring Problem using lvextend: Striped mirrors are not supported
Then how can I mirror a stripe? Is it also possible to disable the striping of LV's so that I can mirror my LV's in using just 1 PV?
Or, I have another idea. With the existing setup of my LV's being striped to three PV's is it possible to mirror it using 1 PV from my new storage?
Like this for example:
lvextend -m 1 /dev/vgtest01/lvname /dev/dsk/cNew/tNew/dNew
(I suppose my LV will be mirrored to this one PV)
then
lvreduce -m 0 /dev/dsk/c37t12d4 /dev/dsk/c37t12d5 /dev/dsk/c37t12d6 (ctd's from old storage)
I am expecting an end result of my LV being mirrored to one single PV and is no longer striped.
Then I'll just keep on adding PVs on my VG to mirror all my LV's until i'm done. Can some confirm of this will work?
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тАО12-08-2010 06:15 PM
тАО12-08-2010 06:15 PM
Re: MIrroring Problem using lvextend: Striped mirrors are not supported
From the sound of it, I prefer the 'old' original design.
No one has ever asked me how to dismantle something I help build or design, before.
But I imagine its very easy.
Can I ask why do you want to 'disable the striping'?
What is your new storage design, if you don't mind me asking.
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тАО12-08-2010 07:37 PM
тАО12-08-2010 07:37 PM
Re: MIrroring Problem using lvextend: Striped mirrors are not supported
I no longer need lv striping since at the storage side, the disks are already striped.
LV striping is just adding up to overhead i/o performance.
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тАО12-11-2010 08:21 AM
тАО12-11-2010 08:21 AM
Re: MIrroring Problem using lvextend: Striped mirrors are not supported
LV striping is just adding up to overhead i/o performance."
Never a truer word spoken.
As I said previously, "Lots of things are possible in Unix, but not all can be supported, for understandable reason." , "You can not stripe a mirror, but you can mirror a stripe."
However using pseudo-stripping, there is nothing preventing you from having 'stripes' of different mirrors, on one disk.
Now take the pseudo-stripping algorithm or similar and put it on a processor board, give it some memory and the 'intelligent disk controller', with mirroring and striping capabilities, is born.
Problem solved.
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