[Gllug] RAID 1 and RAID 5

[Xander D Harkness]

Daniel Andersson wrote:
> i'm assuming you're speaking about a HW solution?
> then it's up to the HW, but most of them (the ones i've dealt with at least)
> doesn't support that
> 
> if you want to change the raid you have to rebuild the entire thing (ie
> delete raid-device and add it back in)
> destroying all the data..
It is a software solution that runs from the /etc/raidtab file:

raiddev /dev/md0
         raid-level      5
         nr-raid-disks   2
         nr-spare-disks  0
         parity-algorithm        left-symmetric
         chunk-size      32
         persistent-superblock 1
         device          /dev/hda1
         raid-disk       0
         device          /dev/hdc1
         raid-disk       1
#        failed-disk    1


What I have just noticed and the maikraid did not complain about was 
that the raidtab is already set to raid 5.

I managed a raid 5 with one disk ;-) (one working, one failed....)

So there should not be a problem adding a third, or would someone like 
to disagree?

Kind regards
Xander
> 
> / d
> 
> ----- Original Message -----
> From: "Xander D Harkness" <xander at harkness.co.uk>
> To: <gllug at linux.co.uk>
> Sent: Wednesday, December 04, 2002 2:20 PM
> Subject: [Gllug] RAID 1 and RAID 5
> 
> 
> 
>>Does anyone know if I can convert a Raid 1 device to a RAID 5 array by
>>changing the raidtab from 1 to 5 and adding a failed device.
>>
>>I am trying to do a hotadd and expand the raid 1 setup.
>>
>>In short will I kill my data? :-)
>>
>>Kind regards
>>Xander
>>--
>>When you are in it up to your ears, keep your mouth shut.
> 
> 
> 


-- 
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	The large glacial deposits that form on the insides
	of car fenders during snowstorms.
		-- "Sniglets", Rich Hall & Friends


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