Roberto Ragusa:
>> I usually do not create RAID-1 on the entire disk space, I prefer
>> to partition into fixed size fragments (e.g. 4 470GB on a 2TB disk)
>> and create many RAID-1 out of partition couples to use as pv. In
>> this way the new shiny 4TB disks are just giving me 8 additional
>> 470GB pieces, I can create the new RAID-1s and pvs, add them to the
>> vg and then use pvmove to decide where the data should be


Mauricio Tavares:
>       While I agree with the "add the pvs to the vgs, pvmove data,
> remove old pvs" approach, I would like to ask more about why you do
> not use the entire disk for a raid, instead partition both drives in
> many volumes and then create raid1 volumes using the respective
> partitions in the two drives. Does that limit the damage due to HD
> failure somehow better than a single partition?

My guess would be that if always creates everything the same size, it's
probably simpler for him to manage.

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