On 07/06/2011 20:12, Stefan G. Weichinger wrote:
Greetings, could you please advise me how to proceed?
On a server I have 2 RAID1-arrays, each consisting of 2 TB-drives:
md5 : active raid1 sde1[0] sdf1[1]
976759936 blocks [2/2] [UU]
md6 : active raid1 sdh1[1] sdg1[0]
976759936 blocks [2/2] [UU]
md5 and md6 are right now physical volumes (PVs) in an LVM-volume-group.
Nearly all the space is used right now (1.7 TB out of the ~2 TB).
Now I would like to move things to a more reliable RAID6 consisting of
all the four TB-drives ...
How to do that with minimum risk?
For sure it would be best to move all data aside, stop the arrays and
build a new one ... etc
Failing two drives and remove them from the RAID1s to build a new
degraded RAID6 seems dangerous to me?
Maybe I overlook a clever alternative?
Suggestions welcome, thanks in advance.
This may be stating the obvious, but you do realise that converting to a
four-disk RAID6 will not give you any more space?
You might want to consider replacing the drives when you do your
re-shaping or rebuilding (whether you go for RAID6 or RAID10,far).
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