On 06/24/2012 12:42 PM Keith Roberts wrote:
> ....
>
> OK. But what about a drive that is already partitioned with
> live data on it. Is it easy to make that work with LVM, or
> does it mean I have to do a fresh installation to use LVM?
Keith,
AFAIK, you'd need to have spare disk space (which might mean, e.g.,
adding a disk, plugging in a thumb drive), temporarily copying the
partition there, then creating the physical volume, volume group, and
logical volume, then copying the data back into the LV. To ensure data
integrity, you'd most likely want to bring the system down to
single-user mode when doing all of this. If the partition you're
working on is read-only, and given you do the unmounting and mounting at
the right times, it would be possible to do this live.
hth,
ken
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06-24-2012, 09:46 PM
ken
On 06/24/2012 12:47 PM Keith Roberts wrote:
> On Sun, 24 Jun 2012, ken wrote:
> *snip*
>
>> > 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.
> And what happens then in that situation - do you loose any
> more data than you would loose with 'standard' primary and
> extended logical partitions, or does using LVM help in
> recovering more data from a bad disk?
>
> Keith
Keith,
There are a lot of ways for a disk to go bad, so it's not really
possible to give an answer. Most people who seriously address this
question work on the assumption that it's easier to keep good backups
than to try to recover data from a bad disk.
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06-25-2012, 07:53 AM
Markus Falb
On 24.6.2012 20:58, Steve Clark wrote:
> On 06/24/2012 12:24 PM, ken wrote:
>> # 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?
>>
> What are the underlying actual physical devices?
$ lvdisplay --maps
--
Kind Regards, Markus Falb
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