On Fri, May 07, 2021 at 09:28:35AM +0800, d tbsky wrote:
> Reindl Harald <h.reindl@xxxxxxxxxxxxx>
> > Am 06.05.21 um 11:57 schrieb d tbsky:
> > > if losing two disks will madam find out the raid can be rebuilded safely or not?
> >
> > it's pretty simple
> >
> > * if you lose the wrong disks all is gone
> > * if you lsoe the right disks no problem
>
> that's seems reasonable. I will give it a try.
My understanding is that raid10 - all layouts - are really raid0 and then raid 1 on top.
If you loose two disks you loose the whole raid in 2 out of 3 cases in a 4 disk setup.
If it was raid0 over a raid1 you would only lose the whole raid in one out of 3.
raid1
raid0 raid0
d1 d2 d3 d4
gone d1+d2 survives d3+d4
gone d1+d3 dead
gone d1+d4 dead
should be.
raid0
raid1 raid1
d1 d2 d3 d4
gone d1+d2 dead
gone d1+d3 survives
gone d1+d4 survives
keld
