[linux-lvm] Re: raid 1 on a single disk

Peter T. Breuer ptb at lab.it.uc3m.es
Sat Nov 13 10:33:25 UTC 2004

ashwin chaugule <ashwin.chaugule at gmail.com> wrote:
>          Im trying to get RAID 1 working on a single disk. Can anyone
> tell me if thats possible ?

Yes, of course it is.

> Do I have to use LVM for that ?


> So, far this is what i've understood ...
> Now.. I have a separate disk on which I want RAID 1.
> so I create one PV on that disk (/dev/hdd)

No you don't. LVM is not involved.

> create a logical vol grp.

No you don't. LVM is not involved.

> add 4 LV's , for four filesystems of the same type ...

No you don't. LVM is not involved.

> then in /etc/raidtab or whatever ..
> say that i have 4 disks and for each disk specify each LV partition ..

No you don't, since LVM is not involved.

> then mkraid /dev/md0 ...
> Is this correct if I want data to be mirrored across all 4 partitions
> , using RAID 1 on a single disk ?

So, you are talking about a mirror with 4 components, all of them
partitions on the same disk?

Well, that's silly, but nothing stops you doing it. Just maek a raidtab
for the mirror and name the partitions as raid-disk components there.
The RAID howto or faq should tell you all you need to know, as should
the mananpage for the conf file or mdadm, or whatever ...


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