Bug#783089: debian-installer: Cannot rescue a system installed on a raid1 lvm
On Wed, Apr 22, 2015 at 07:49:02AM +0200, Jean-Yves LENHOF wrote:
> Because I prefer do it this way... lvm raid is more the traditionnal
> unix way of doing it (AIX and HP-UX for sure)
That doesn't mean it is a good idea. Those two certainly qualify as
the most unpleasant unix systems I have ever had to work with.
> Why it is very inflexible ? It found it quite flexible.
You can't easily add disks to the volume group in raid mode (as far as
I recall the documentation last I looked at it). There are certainly
restrictions on how to you expand volumes when lvm raid is in use.
> Perhaps the md raid support is there from a longer time because raid1
> support (which is different from mirror support) in the kernel (and in
> lvm2 tools) came later... But things changes and I saw a lot of good
> things coming in LVM like thin lvm support or cache lvm support. Read
> redhat docs, such things are supported by RedHat since RedHat Enterprise
> 6.4 or such.
Well certainly grub understands md raid, and it understands some lvm.
It might not understand lvm with raid. Following the grub development
mailing list for a number of years now, I can say I have never seen
anyone ask about it or even mention it. I think it is also the first
time I have seen it mentioned on any of the debian lists I follow.
Certainly using lvm on top of md raid has worked for years for me and
the debian rescue knows how to deal with is, as does knoppix and lots
of other rescue systems. The lvm raid, no idea. When I looked at it
a few years ago it cretainly sounded like a bad option so I avoided it.
--
Len Sorensen
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