LVM negates benefits of jounaling filesystems? [was RFE: autofsck]

[max bianco]

On Tue, Jun 10, 2008 at 9:46 AM, Chuck Anderson <cra at wpi.edu> wrote:
> On Tue, Jun 10, 2008 at 08:36:31AM -0500, Eric Sandeen wrote:
>> journaling filesystem you really shouldn't have any filesystem metadata
>> integrity problems on power loss; that is, if you have barriers on
>> (which ext3 doesn't by default) and if your storage can pass barriers
>> (which lvm doesn't), or if you have drive write cache disabled (which
>> hurts performance pretty badly).
>
> I wasn't aware that LVM destroyed the kind of guarantees about
> filesystem metadata being written out to disk that jounaling
> filesystems rely on?  If so, should we perhaps rethink the decision to
> use LVM by default on Fedora installs?
>

What was the reason for using LVM in the first place. My most recent
install I was really tempted to not go with the defaults but because I
really don't know much about filesystems, I figured the best thing in
that case was stick to the defaults. Now I am reconsidering
again...could someone explain the comparative advantages/disadvantages
? Before i do something stupid .


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