Moving RAID1 disks between systems

Moving RAID1 disks between systems

[Jim Santos]

Hi,

Let's say that two people each have a system with a RAID1 array made
up of two disks
(/dev/sda & /dev/sdb).  Now let's say that one of the systems
experiences a failure that
keeps it from being able to be started (e.g. blown motherboard).  Is
there a way to get the
data off of the failed system's disks after putting them in the
working system?  It seems to
me that the disk device names stored in the superblock are going to
conflict with the device
names of the existing disks.  But then again, I'm not a SW RAID expert ;-)

TIA

Re: Moving RAID1 disks between systems

[Drew]

Hi Jim,

You should have no troubles reassembling the array on a new machine.
From what I understand, md raid doesn't depend on device names for
assembling arrays, it has some internal UUID's to distinguish which
array a member disk belongs to.

mdadm --assemble --scan is pretty much all you need (and won't break
anything in the process)



-- 
Drew

"Nothing in life is to be feared. It is only to be understood."
--Marie Curie

"This started out as a hobby and spun horribly out of control."
-Unknown

Re: Moving RAID1 disks between systems

[Jim Santos]

On Fri, May 24, 2013 at 2:30 PM, Drew <drew.kay@gmail.com> wrote:
>
> Hi Jim,
>
> You should have no troubles reassembling the array on a new machine.
> From what I understand, md raid doesn't depend on device names for
> assembling arrays, it has some internal UUID's to distinguish which
> array a member disk belongs to.
>
> mdadm --assemble --scan is pretty much all you need (and won't break
> anything in the process)
>
>
Is there a way to rename md devices?  It would be useful in general and
maybe necessary if assembling the arrays from the other system causes
md device name collisions

Re: Moving RAID1 disks between systems

[Roy Sigurd Karlsbakk]

----- Opprinnelig melding -----
> On Fri, May 24, 2013 at 2:30 PM, Drew <drew.kay@gmail.com> wrote:
> >
> > Hi Jim,
> >
> > You should have no troubles reassembling the array on a new machine.
> > From what I understand, md raid doesn't depend on device names for
> > assembling arrays, it has some internal UUID's to distinguish which
> > array a member disk belongs to.
> >
> > mdadm --assemble --scan is pretty much all you need (and won't break
> > anything in the process)
> >
> >
> Is there a way to rename md devices? It would be useful in general and
> maybe necessary if assembling the arrays from the other system causes
> md device name collisions

if you mean device name, it's configured in /etc/mdadm/mdadm.conf or similar (varies a bit between distros). that should hold the device name and its UUID

Vennlige hilsener / Best regards

roy
--
Roy Sigurd Karlsbakk
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roy@karlsbakk.net
http://blogg.karlsbakk.net/
GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt
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