[linux-lvm] LVM/RAID or viceversa?

[linux-lvm] LVM/RAID or viceversa?

[Peter Thalmann]

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Hallo, 
I catched you on the ml, discussing on lvm and raid,so please explain me the difference between raid on top of lvm and lvm on top of raid. Is it first setting up the disk using raid tools and then configuring the lvm (lvm on top of raid) or first setting up the drives using lvm and then setting up the raid (raid on top of lvm) wich makes actually no sense to me because of confusing the layers and making managemnet quite difficult. Am I wrong ?

Thanks, Peter

"a nice little guy from italy"

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RE: [linux-lvm] LVM/RAID or viceversa?

[Hansen,Ole OHA]

Hi,

You can actually do it both ways; LVM on RAID and RAID with LVM :) The
problem with the latter is LVM for Linux does not yet support anything else
than striping. I have an installation running LVM on top of a mirrored md -
the Linux software raid; it works like a charm! :) 

--
Ole Hansen


-----Original Message-----
From: Peter Thalmann [mailto:peterth@gmx.net]
Sent: Friday, December 07, 2001 4:28 AM
To: linux-lvm@sistina.com
Subject: [linux-lvm] LVM/RAID or viceversa?


Hallo, 
I catched you on the ml, discussing on lvm and raid,so please explain me the
difference between raid on top of lvm and lvm on top of raid. Is it first
setting up the disk using raid tools and then configuring the lvm (lvm on
top of raid) or first setting up the drives using lvm and then setting up
the raid (raid on top of lvm) wich makes actually no sense to me because of
confusing the layers and making managemnet quite difficult. Am I wrong ?

Thanks, Peter

"a nice little guy from italy"

Re: [linux-lvm] LVM/RAID or viceversa?

[DoudOUKE]

Hi,
I made LVM on a RAID 1 device and it work perfectly :)
But I don't know howto restore data if one of my disk crash.
thx
DoudOUKE

On Fri, 7 Dec 2001 09:31:18 +0100
"Hansen,Ole OHA" <oha@kmd.dk> wrote:

> Hi,
> 
> You can actually do it both ways; LVM on RAID and RAID with LVM :) The
> problem with the latter is LVM for Linux does not yet support anything else
> than striping. I have an installation running LVM on top of a mirrored md -
> the Linux software raid; it works like a charm! :) 
> 
> --
> Ole Hansen
> 
> 
> -----Original Message-----
> From: Peter Thalmann [mailto:peterth@gmx.net]
> Sent: Friday, December 07, 2001 4:28 AM
> To: linux-lvm@sistina.com
> Subject: [linux-lvm] LVM/RAID or viceversa?
> 
> 
> Hallo, 
> I catched you on the ml, discussing on lvm and raid,so please explain me the
> difference between raid on top of lvm and lvm on top of raid. Is it first
> setting up the disk using raid tools and then configuring the lvm (lvm on
> top of raid) or first setting up the drives using lvm and then setting up
> the raid (raid on top of lvm) wich makes actually no sense to me because of
> confusing the layers and making managemnet quite difficult. Am I wrong ?
> 
> Thanks, Peter
> 
> "a nice little guy from italy"
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
> 

RE: [linux-lvm] LVM/RAID or viceversa?

[Hansen,Ole OHA]

> Hi,
> I made LVM on a RAID 1 device and it work perfectly :)

Sounds like, we have somewhat the same configuration! 

> But I don't know howto restore data if one of my disk crash.

Well, that should be pretty easy to do.. The first thing to do, if you
suspect one of your disks has died is to do a cat on /proc/mdstat.

I don't know, if you have to issue a raidhotremove, but you need to remove
the faulty disk, make a new one ready, alter the /etc/raidtab (if the new
disk is on another device) and use raidhotadd... Please do yourself the
favour adn read the man pages! :) (Can't remember the syntax for them, since
I've never needed to use them... )

> thx
> DoudOUKE

-- 
Ole Hansen