[nflug] data recovery

[David J. Andruczyk]

If two of the drives are NOT EVEN SEEN by
thecontroller's BIOS you have bigger problems... 
Check cabling, power  proper termination. (teriniation
is at the ENDs ofthe busm, NOT ON EACH DRIVE. (you
wouldn';t beleive how many boxes I've worked on where
some moron terminated EVERY DRIVE on the bus and
wondered why he couldn't get more than 3-4 scsi
devices to work on  the bus before getting weird
errors)

As for recovery on the other drives, it's not likely 
to be doable,  as I have zero info as to how you
created your LVM originally. (i.e was it all one VG
using all four drives in a span,  was it striped? (if
so your'e defeinitely screwed), was it multiple VG's?

LVM is ideal to be used for large drives, or disk
arrays as presented by a RAID controller. It's  also
useful for individula drives , but beware if they are
concatenated together (the default), and you loose
one,  u lost it all essentially.


--- eric at bootz.us wrote:

> My apologies for blaming LVM , it's just my lack of
> knowledge and  
> realizing that I should set systems up with file
> systems I understand  
> better or partitions schemes
> 
> But the senario is this:
> 
> For sure two scsi drives do not show up in the scsi
> bios controller  
> the other two scsi drives still show up, but I
> cannot do lvscan or  
> find containers on them when booting with 5.1.1
> knoppix live or a  
> CentOS scsi When I installed CentOS on another scsi
> drive that I had  
> laying around I made sure that the install did not
> touch the other two  
> scsi drives they show up in the centOS build as sdb
> and sdc in /dev,  
> but centOS doesn't recognize the file system and to
> reiterate, cannot  
> see any other containers than itself.
> 
> Is it possible that the two scsi drives that are
> still good have  
> recoverable data on them?
> 
> 
> 
> 
> Quoting "David J. Andruczyk"
> <djandruczyk at yahoo.com>:
> 
> > use the same OS as is installed on the box and use
> the
> > rescue option. (nearly every linux distrohas that)
> >
> > And it's unlikely that LVM is the problem.  LVM
> won't
> > stop the system from seeing the hard drives.  If
> you
> > corrupt the LVM partition(s), you can trash the
> entire
> > LVM,  butthat's  the same as trashing the
> partition
> > table wiht a non LVM setup.
> >
> > don't be so quick to blame it on LVM.
> >
> >
> > --- eric <eric at bootz.us> wrote:
> >
> >> Greetings,  I'm trying to use knoppix to recover
> >> from disaster.
> >>
> >> I have a scsi raid server that is setup as LVM
> that
> >> is the culprit.
> >> When I try to use knoppix none of the hard drives
> >> show up, I really need
> >> help... bad.
> >>
> >> Throw me a life line and I promise never to set
> up
> >> an email server with
> >> LVM ever again.
> >>
> >> Thanks
> >> _______________________________________________
> >> nflug mailing list
> >> nflug at nflug.org
> >> http://www.nflug.org/mailman/listinfo/nflug
> >>
> >
> >
> > -- David J. Andruczyk
> >
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> 
> 
> 
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-- David J. Andruczyk

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