[linux-lvm] LVM. Do i loose everything?

[linux-lvm] LVM. Do i loose everything?

[kyr]

Hello,

     I wound be thankful if you can answer one simple question that I 
haven't found the answer in all the LVM manuals, FAQ, howtos.

I have a continuous (not stiped) VG consisting of 3 PV (Hard Disks) with 
one LV on EXT3.

If one hard disk fails (hardware) will i loose everything on all disks?


I thank you in advance.

Re: [linux-lvm] LVM. Do i loose everything?

[Ming Zhang]

On Mon, 2006-04-17 at 01:40 +0300, kyr wrote:
> Hello,
> 
>      I wound be thankful if you can answer one simple question that I 
> haven't found the answer in all the LVM manuals, FAQ, howtos.
> 
> I have a continuous (not stiped) VG consisting of 3 PV (Hard Disks) with 
> one LV on EXT3.
> 
> If one hard disk fails (hardware) will i loose everything on all disks?

depends on how u define everything. if u have 3 disk and 1 disk fail,
then u lose the data bytes on that disk only. but since u run ext3 on
it. ext3 will not be able to run properly with that. then u will not be
able to read u file out. so u lose u "files".

try not do that with u important data.

ming


> 
> 
> I thank you in advance.
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

Re: [linux-lvm] LVM. Do i loose everything?

[Shawn]

On Sunday 16 April 2006 16:40, kyr wrote:
> Hello,
>
>      I wound be thankful if you can answer one simple question that I
> haven't found the answer in all the LVM manuals, FAQ, howtos.
>
> I have a continuous (not stiped) VG consisting of 3 PV (Hard Disks) with
> one LV on EXT3.
>
> If one hard disk fails (hardware) will i loose everything on all disks?

I'm far from an expert with LVM, but I think the answer is a safe No.  And 
even further, you could possibly recover the data on the damaged drive (see 
http://grover.open2space.com/node/17).

The data stored on that particular drive might become in accessible (without 
any recovery efforts), but the data sitting on the other drives should still 
be there.  

I'm taking a guess based on what I saw during a data recovery process, but...  
It looks like the drive/partition is tagged as being part of a volume, and 
then the appropriate file system is applied.  If this is the case, then 
loosing a drive should not corrupt your filesystem on the remaining drives.  

I am not comfortable enough with my knowledge to say this is anywhere near 
authoritative.  But I do hope I helped...

Shawn

Re: [linux-lvm] LVM. Do i loose everything?

[Ming Zhang]

On Fri, 2006-04-21 at 17:12 -0600, Shawn wrote:
> On Sunday 16 April 2006 16:40, kyr wrote:
> > Hello,
> >
> >      I wound be thankful if you can answer one simple question that I
> > haven't found the answer in all the LVM manuals, FAQ, howtos.
> >
> > I have a continuous (not stiped) VG consisting of 3 PV (Hard Disks) with
> > one LV on EXT3.
> >
> > If one hard disk fails (hardware) will i loose everything on all disks?

depends on how we define "disk fails" then.

> 
> I'm far from an expert with LVM, but I think the answer is a safe No.  And 
> even further, you could possibly recover the data on the damaged drive (see 
> http://grover.open2space.com/node/17).

if disk has some bad sectors but most other places are readable, then
dd_rescue will be more than enough and follow this link should be ok.
thanks for pointing out this link.


> 
> The data stored on that particular drive might become in accessible (without 
> any recovery efforts), but the data sitting on the other drives should still 
> be there.  

yes, data is there.

> 
> I'm taking a guess based on what I saw during a data recovery process, but...  
> It looks like the drive/partition is tagged as being part of a volume, and 
> then the appropriate file system is applied.  If this is the case, then 
> loosing a drive should not corrupt your filesystem on the remaining drives.  

if it is single file system over all 3 HDs, then will the file system
runs ok? i do not think so.


> 
> I am not comfortable enough with my knowledge to say this is anywhere near 
> authoritative.  But I do hope I helped...
> 
> Shawn
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/