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

[ashwin chaugule]

yes i know its silly ... im doing what im told to do :p

ok so, i also do know, its performance is going to suck !
but i was under the impression that RAID 1 works on more that one disks only.

so you mean to say that, the linux RAID / md tools support raid 1 on
multiple partitiions of the same disk ?

Regards,
Ashwin
 



On Sat, 13 Nov 2004 11:33:25 +0100, Peter T. Breuer <ptb at lab.it.uc3m.es> wrote:
> 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 ?
> 
> No.
> 
> > 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 ...
> 
> Peter
> 
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> 


-- 
Ashwin Chaugule
Embedded Systems Engineer
Aftek Infosys ltd.
[Embedded Division]