Mailinglist Archive: opensuse (1125 mails)

[Ken Schneider - openSUSE <suse-list3@xxxxxxxxxxxxx>]

On 05/06/12 22:00, Anton Aylward pecked at the keyboard and wrote:
> John Andersen said the following on 05/06/2012 09:31 PM:
>
> > As for mixing and matching size with LVM, its almost always an accident
> > waiting to happen. When your partition is scattered across multiple
> > drives, a failure of any one will likely take down everything.
>
> Yes, you *CAN* configure LVM that way.
> it is one of the *MANY* ways you can configure LVM and because of that
> it is a reason many people find LVM confusing and difficult to use.  It
> is fraught with decision alternatives you have to make.
>
> That being said those alternative also allow you to do things like
> mirroring, yes *REAL* mirroring.  And you have the flexibility of doing
> it on a file system basis, not just a drive basis.
>
> Yes, you can also stripe across spindles and scatter-gather across
> spindles with LVM and yes that will cause a catastrophe if you loose a
> spindle.  But no-one is forcing you to use that rather than mirroring.
>
> The same applies with RAID.  There are many ways of doing it and not all
> offer reliability in the event of a loss of a spindle.
>
> The OP mentioned the need to protect the data but no the OS.
> using different strategies for different file systems is a capability of
> LVM not enjoyed by RAID.
>
>
> > LVM was not made for reliability, it was made to allow building
> > big volumes from several smaller devices.
>
> That too.  LVM has many capabilities.
> Don't focus on just one.
>
> Hmm. Some configurations of RAID can be said to allow building big
> volumes by spreading a file system across several small devices as well.

(R)edundant
(A)rray of
(I)nexpensive
(D)isks

--
Ken Schneider
SuSe since Version 5.2, June 1998
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