Creating in degraded mode...

Creating in degraded mode...

[rmack]

I currently have a 2 drive RAID-1 array.  I would like to convert it into 
a 3 drive RAID-5 array.  I'd rather avoid raidreconf because I'v never 
used it before.  It seems to me, that I should be able to run the existing 
RAID-1 in degraded mode (only one drive), and then copy it's contents to a 
degraded (only two drive) RAID-5 array.  The question, of course, is how 
do I create a RAID-5 array in degraded mode?  After the copy, I would then 
hotadd the other former RAID-1 drive into the RAID-5 and let it 
reconstruct the array.

Any thoughts?  Please reply to me directly, I'm off the list for now.

Thanks, Ryan Mack

Re: Creating in degraded mode...

[Adam Luter]

Using 'missing' for the device name for the missing devices.

-Gryn (Adam Luter)

On Wed, Feb 26, 2003 at 08:22:13AM -0800, rmack@mackman.net wrote:
> I currently have a 2 drive RAID-1 array.  I would like to convert it into 
> a 3 drive RAID-5 array.  I'd rather avoid raidreconf because I'v never 
> used it before.  It seems to me, that I should be able to run the existing 
> RAID-1 in degraded mode (only one drive), and then copy it's contents to a 
> degraded (only two drive) RAID-5 array.  The question, of course, is how 
> do I create a RAID-5 array in degraded mode?  After the copy, I would then 
> hotadd the other former RAID-1 drive into the RAID-5 and let it 
> reconstruct the array.
> 
> Any thoughts?  Please reply to me directly, I'm off the list for now.
> 
> Thanks, Ryan Mack
> 
> -
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Re: Creating in degraded mode...

[Kourosh Ghassemieh]

I'm interested in this as well.

Isn't a RAID-5 array with two missing drives broken?

Has anyone actually tried this?  I don't have any spare
drives to play with to test.

The other option is to break the RAID-1, create a new
RAID-5 with the two drives and the third, RAID-1, drive
as the missing drive in the RAID-5 set.  Copy over the
data from the RAID-1 drive and then add that drive back
into the RAID-5 array and it should rebuild.

Any thoughts?

Regards,

Kourosh

At 08:57 AM 2/26/2003, Adam Luter wrote:
>Using 'missing' for the device name for the missing devices.
>
>-Gryn (Adam Luter)
>
>On Wed, Feb 26, 2003 at 08:22:13AM -0800, rmack@mackman.net wrote:
> > I currently have a 2 drive RAID-1 array.  I would like to convert it into
> > a 3 drive RAID-5 array.  I'd rather avoid raidreconf because I'v never
> > used it before.  It seems to me, that I should be able to run the existing
> > RAID-1 in degraded mode (only one drive), and then copy it's contents to a
> > degraded (only two drive) RAID-5 array.  The question, of course, is how
> > do I create a RAID-5 array in degraded mode?  After the copy, I would then
> > hotadd the other former RAID-1 drive into the RAID-5 and let it
> > reconstruct the array.
> >
> > Any thoughts?  Please reply to me directly, I'm off the list for now.
> >
> > Thanks, Ryan Mack

Re: Creating in degraded mode...

[Adam Luter]

Devices, was a mistake, I meant to say device.  You're wanting to do
the same as Ryan.  No reason it shouldn't work.  Just know that RAID-5
in degraded mode can be kinda slow.

-Adam

On Wed, Feb 26, 2003 at 09:59:19AM -0800, Kourosh Ghassemieh wrote:
> 
> I'm interested in this as well.
> 
> Isn't a RAID-5 array with two missing drives broken?
> 
> Has anyone actually tried this?  I don't have any spare
> drives to play with to test.
> 
> The other option is to break the RAID-1, create a new
> RAID-5 with the two drives and the third, RAID-1, drive
> as the missing drive in the RAID-5 set.  Copy over the
> data from the RAID-1 drive and then add that drive back
> into the RAID-5 array and it should rebuild.
> 
> Any thoughts?
> 
> Regards,
> 
> Kourosh
> 
> At 08:57 AM 2/26/2003, Adam Luter wrote:
> >Using 'missing' for the device name for the missing devices.
> >
> >-Gryn (Adam Luter)
> >
> >On Wed, Feb 26, 2003 at 08:22:13AM -0800, rmack@mackman.net wrote:
> >> I currently have a 2 drive RAID-1 array.  I would like to convert it into
> >> a 3 drive RAID-5 array.  I'd rather avoid raidreconf because I'v never
> >> used it before.  It seems to me, that I should be able to run the 
> >existing
> >> RAID-1 in degraded mode (only one drive), and then copy it's contents to 
> >a
> >> degraded (only two drive) RAID-5 array.  The question, of course, is how
> >> do I create a RAID-5 array in degraded mode?  After the copy, I would 
> >then
> >> hotadd the other former RAID-1 drive into the RAID-5 and let it
> >> reconstruct the array.
> >>
> >> Any thoughts?  Please reply to me directly, I'm off the list for now.
> >>
> >> Thanks, Ryan Mack
> 
> -
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