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тАО04-13-2012 04:46 AM
тАО04-13-2012 04:46 AM
converting legacy filesystem to persistent filesystems and viceversa
Hi Team,
Currently we are using legacy filesystems (/dev/dsk/ctd) for creating vgs. Now we want to convert existing vgs to persistant device files . Is this is possible without data loss. And one more thing if i convert once to persistant device files then can i convert back those vgs to legacy type.
Could any one please help me on this
Regards
Laiju C Babu
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тАО04-13-2012 05:10 AM
тАО04-13-2012 05:10 AM
Re: converting legacy to persistent device special files
Just use "vgdsf" to convert the lagy to persistant device special files within LVM.
Hope this helps!
Regards
Torsten.
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тАО04-13-2012 05:30 AM
тАО04-13-2012 05:30 AM
Re: converting legacy to persistent device special files
Hi Torsten,
Thanks for the reply,
Could you please tell me can i convert back this to legacy again
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тАО04-13-2012 05:44 AM
тАО04-13-2012 05:44 AM
Re: converting legacy to persistent device special files
vgdsf is a script that basically extends the persistant files and reduces the legacy.
So you can do the same to revert back - but IMHO there is absolutely no reason to do this.
Hope this helps!
Regards
Torsten.
__________________________________________________
There are only 10 types of people in the world -
those who understand binary, and those who don't.
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тАО04-13-2012 05:52 AM
тАО04-13-2012 05:52 AM
Re: converting legacy to persistent device special files
Hi Torsten,
But i didnt see any option in vgdsf to rollaback to legacy..
We are in a planning stage of this . So i want if any thing goes wrong is there any chance for roll back to legacy.
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тАО04-13-2012 05:55 AM
тАО04-13-2012 05:55 AM
Re: converting legacy to persistent device special files
# vgextend vg__ /dev/disk/disk__
# vgreduce vg__ /dev/dsk/cxtydz
and so on ...
so you can do the same to revert back - but it will never be needed.
With 11.31 you should use the persistant device files as standard.
Hope this helps!
Regards
Torsten.
__________________________________________________
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those who understand binary, and those who don't.
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тАО04-16-2012 09:22 AM
тАО04-16-2012 09:22 AM
Re: converting legacy to persistent device special files
Hi Torsten,
Thanks for your time . Using vgdsf i converted legacy to persistant device files...
Then as you told , for roll back i extended the vg to all legacy files then i reduced the vg from the persistent device files...
There was no data loss. and we can do it online also .......
Regards
Laiju
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тАО04-16-2012 09:51 AM
тАО04-16-2012 09:51 AM
Re: converting legacy to persistent device special files
Hi Torsten,
Could you please tell me what are the advantages of using persistant device over legacy
Regards
Laiju
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тАО04-16-2012 09:56 AM
тАО04-16-2012 09:56 AM
Re: converting legacy to persistent device special files
Let's assume you have 10 LUNs on multiple paths, now you have 10 device files, in the past you could have 80 paths or more.
Hope this helps!
Regards
Torsten.
__________________________________________________
There are only 10 types of people in the world -
those who understand binary, and those who don't.
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