[linux-lvm] Whats happens? -> remove first phy disk from lvm

[linux-lvm] Whats happens? -> remove first phy disk from lvm

[Denny Schierz]

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hi,

i created a lvm volume over two partitions, hda8 and hdc8. Now hda8 is
broken and have to replace the disk. 

on the lvm where several files. My questions, if i create a volume over
more than one partition, is that a stipe? Or does lvm use the first
partition, than the second?

cu denny


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Re: [linux-lvm] Whats happens? -> remove first phy disk from lvm

[Patrick Caulfield]

Denny Schierz wrote:
> hi,
> 
> i created a lvm volume over two partitions, hda8 and hdc8. Now hda8 is
> broken and have to replace the disk. 
> 
> on the lvm where several files. My questions, if i create a volume over
> more than one partition, is that a stipe? Or does lvm use the first
> partition, than the second?
> 


By default LVM will use the first PV, then the next. Striping has to be
specified when you create the LV.

Depending on the filesystem (and luck) you might get some files back off the
remaining disk :)


-- 

patrick

Re: [linux-lvm] Whats happens? -> remove first phy disk from lvm

[Denny Schierz]

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hi,

Am Mittwoch, den 12.07.2006, 10:47 +0100 schrieb Patrick Caulfield:

> Depending on the filesystem (and luck) you might get some files back off the
> remaining disk :)

hmm, thanks. It seems, that the files lost, cause i don't expecting,
that these files are on the second disk.

But, keep in mind, is there a way, to reactivate the lvm without loosing
data on hdc8, if i adding hda8 to the lvm?

cu denny

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Re: [linux-lvm] Whats happens? -> remove first phy disk from lvm

[Dieter Stüken]

Denny Schierz wrote:
> But, keep in mind, is there a way, to reactivate the lvm without loosing
> data on hdc8, if i adding hda8 to the lvm?

adding hda8? you mean replacing hda8?

Dieter.

Re: [linux-lvm] Whats happens? -> remove first phy disk from lvm

[Denny Schierz]

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hi,

Am Mittwoch, den 12.07.2006, 14:08 +0200 schrieb Dieter Stüken:

> Denny Schierz wrote:
> > But, keep in mind, is there a way, to reactivate the lvm without loosing
> > data on hdc8, if i adding hda8 to the lvm?
> 
> adding hda8? you mean replacing hda8?

thanks all for the reply. I replaced hda with a new disk. The System was
on raid, but some data are not, cause of insufficient space.

I deleted the references for the old /dev/daten and recreated the
logical volumes.

i expected first, that lvm create a stripe, but that is an extra option,
to do that.


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Re: [linux-lvm] Whats happens? -> remove first phy disk from lvm

[Dieter Stüken]

Denny Schierz wrote:
> i created a lvm volume over two partitions, hda8 and hdc8. Now hda8 is
> broken and have to replace the disk. 
> 
> on the lvm where several files. My questions, if i create a volume over
> more than one partition, is that a stipe? Or does lvm use the first
> partition, than the second?

have a look into /etc/lvm/backup/ to see how your VG was organized.

> on the lvm where several files.

You mean several "LVs"? If you have one big LV spread over both disks
it will be difficult to restore any files from the broke file system
within that LV.

Consider using smartmontools to monitor disk errors before it fails completely.

http://smartmontools.sourceforge.net/

Dieter.