[linux-lvm] how can I setup software RAID1 on a running LVM system

[linux-lvm] how can I setup software RAID1 on a running LVM system

[beklan]

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Hi,


I m using Centos 5.5 with LVM system,and I m trying to setup sofrware RAİD
on that system. Does anybody help  me ?


I dont have raid card because of that I have to setup the system  with
software raid. 


My problems are, how can I add new disk on running system or how can I get
back datas if system fail.

 

beklan


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Re: [linux-lvm] how can I setup software RAID1 on a running LVM system

[Claus Koch]

2011/8/16, beklan <biseri@ciu.edu.tr>:
>
>
> Hi,
>
>
> I m using Centos 5.5 with LVM system,and I m trying to setup sofrware RAİD
> on that system. Does anybody help  me ?
>
>
> I dont have raid card because of that I have to setup the system  with
> software raid.
>
>
> My problems are, how can I add new disk on running system or how can I get
> back datas if system fail.
>
>
>
> beklan
>
>

-- 
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Claus Koch
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Re: [linux-lvm] how can I setup software RAID1 on a running LVM system

[Ray Morris]

"man mdadm" or:
http://tinyurl.com/4pjnu43
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On Wed, 17 Aug 2011 08:06:34 +0200
Claus Koch <claus.koch@thinkproject.com> wrote:

> 2011/8/16, beklan <biseri@ciu.edu.tr>:
> >
> >
> > Hi,
> >
> >
> > I m using Centos 5.5 with LVM system,and I m trying to setup
> > sofrware RAÄ°D on that system. Does anybody help  me ?
> >
> >
> > I dont have raid card because of that I have to setup the system
> > with software raid.
> >
> >
> > My problems are, how can I add new disk on running system or how
> > can I get back datas if system fail.
> >
> >
> >
> > beklan
> >
> >
> 

Re: [linux-lvm] how can I setup software RAID1 on a running LVM system

[James Hawtin]

Ray Morris wrote:
> "man mdadm" or:
> http://tinyurl.com/4pjnu43
>   
Alturnatively he might want to create a mirror using LVM not a block 
device. Answer when you create the LV using "lvcreate" use the -m option 
to set the number of mirror copies. Alturnatively you can use lvconvert 
to change a normal LV into a mirrored one.

The question of how to get the system back if a disk fails in a tricky 
one.... If a disk fails the system should keep on working as there is a 
copy of the information so it will continue to work, Hardware might have 
problems with the drive if it is not a clean failure though, what is 
needed is to reduce out the damaged disk and add a new undamaged one, 
the one problem is the BOOT block if the disk is the boot device, then 
you might need use grub to setup a new boot block on the new device.

James