[CentOS] partitions vs. LVs [was: Re: How to upgrade from 5.8 to 6.2]

[ken]

On 06/24/2012 12:04 PM Steve Clark wrote:
> On 06/24/2012 11:21 AM, ken wrote:
>> On 06/24/2012 09:41 AM Benjamin Franz wrote:
>>> On 06/24/2012 12:05 AM, Gene Heskett wrote:
>>>> And what do you do when this LVM goes corrupt in about a month? I've
>>>> had it self destruct on me twice. I hate it when that happens.
>>> I would look for some other issue like bad hardware. Over the last
>>> several years I've routinely used LVM for pretty much everything and
>>> have never had it go corrupt on me except when there was a hardware
>>> failure involved. My standard buildouts use LVM over RAID.
>> Gene,
>>
>> Yeah, the problem is more than likely in your hardware.  I've used it on
>> hundreds of machines and since 1999 and never had a problem traceable to
>> LVM.  On the other hand, I've seen a lot of disks go bad.
>>
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> What I don't like about LVM. at least on a personal system, is it
> obfuscates where things are if you have multiple
> underlying drives. You can't just do a df -h and see what the physical
> layout really is. I guess there are some
> pvdisplay and lvdisplay commands that can show this - but I always have
> to look them up and when things go
> kaflooey and your system isn't working then what - bring out the rescue
> cd and hope you can figure it out.
>
>
> --
> Stephen Clark
> *NetWolves*
> Director of Technology
> Phone: 813-579-3200
> Fax: 813-882-0209
> Email: steve.clark at netwolves.com
> http://www.netwolves.com

It helps during their creation, rather than just accepting the defaults, 
to give the LVs meaningful names.  But even if you don't:

# df -H
Filesystem             Size   Used  Avail Use% Mounted on
/dev/mapper/VolGroup00-lvroot
                         31G    12G    18G  39% /
/dev/mapper/VolGroup00-lvtmp
                        195M    55M   131M  30% /tmp
/dev/mapper/VolGroup00-lvvar
                         21G   1.2G    19G   6% /var
/dev/mapper/VolGroup00-lvhome
                        185G    40G   136G  23% /home
/dev/hda3              518M    46M   446M  10% /boot


Where's the difficulty?