----- "James Olin Oden" <james.oden@xxxxxxxxx> escreveu:
> For quite some time I've used raid 1 as a means of providing a
> rollback mechanism for an upgrade (which I learned from others long
> ago). So essentially, before an upgrade you split the mirrors and
> upgrade one side or the other. If your upgrade goes well you sync
> one way, if your upgrade does not you sync the other (much hand waving
> and chanting going on, as its more complicated than that, but that is the
> essence of the solution).
Nice, I didn't think on this before... Will make a try :)
> Recently, I was asked to do the same thing but with a raid 1+0
> solution. Its easy, enough to break the raid 1 volumes underneath,
> but then how do I use the broke off volumes to form the duplicate strip.
> Pictures may help.
> We start off looking like:
>
> /----------- Raid 0 Volume ----------\
> | [disk 0]<---R 1--->[disk 2] |
> | |
> | [disk 1]<---R 1--->[disk 3] |
> \--------------------------------------------/
>
>
> What we want to go to is:
>
> /--- Raid 0 ---\ /--- Raid 0 ---\
> | [disk 0] | | [disk 2] |
> | | | |
> | [disk 1] | | [disk 3] |
> \-----------------/ \------------------/
> Old System New System
>
> Is this possible with the current set of mdadm tools?
Humm... didn't know if it's possible, but IMHO it'll be much easier to
do if you use a 0+1 RAID instead of a 1+0 schema :)
Antonio.
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