Mailinglist Archive: opensuse (1677 mails)

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Re: [opensuse] How to partitioning in unallocated disk space
Felix Miata said the following on 12/05/2011 10:51 AM:

On 2011/12/05 08:43 (GMT-0500) Anton Aylward composed:

if you do allocate all the space, LVM lets you do something
that the "extended" partition doesn't. A LVM volume group may span more
than one disk - logical[5] or spindle. Slide another drive in there,
put LVM on it, add it to the first volume group and you can extend the
fs across it. This is not mounting a new fs, this really is increasing
the size of the fs and making it span more than one drive.

Sounds like the same disadvantage as RAID0: one spindle dies, and takes down
more than one's data in the process. I don't have faith in hardware that
justifies recommending this to anyone.

Yes, it does SOUND like that, just as if you were to describe RAID and
stop at RAID0 it would SOUND like RAID was pretty useless and highly
vulnerable.

The thing is that there is more to RAID that RAID0 and more to LVM than
I've described. But, it seems, Felix, you want to play both sides of
the street. A short while ago you were chastising me for encouraging
newbies to use LVM because its complicated, now you're saying its not up
to a more more complex approach - RAID - that would certainly overwhelm
a newbie. You want it both ways ...

LVM is incremental; you can add a second drive and make its partitions
do more than one thing; they can mirror -- just like RAID - they can
stripe - just like RAID - and more. Users can do one or both or neither
or other things. They can LEARN at LOW RISK.

And yes, you can implement LVM on top of RAID. Why? Because LVM
brings a lot of flexibility to disk management. That's what you keep
forgetting. Its not an either/or situation.

--
Ignorance feeds on ignorance. Science phobia is contagious.
--Carl Sagan, The Demon-Haunted World
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