what kind of raid is this?

[ToddAndMargo]

Hi All,

Well, the 11 year old server came down around the
customer'w ears.  The motherboard went south.
Got a new server on the way.

The hard drives are healthy (raid1).   But can I mount
one of the as a second drive to see data in the new
server?

Now this is embarrassing.  I forgot what kind of raid1
I used.  RSTe maybe?

Here is the print out I received from the raid
checking program I wrote that I fire off every
month:

/dev/md126:
         Container : /dev/md/imsm0, member 0
        Raid Level : raid1
        Array Size : 890763264 (849.50 GiB 912.14 GB)
     Used Dev Size : 890763264 (849.50 GiB 912.14 GB)
      Raid Devices : 2
     Total Devices : 2

State : active

Active Devices : 2
   Working Devices : 2
    Failed Devices : 0
     Spare Devices : 0

Consistency Policy : resync

UUID : 187c7c9f:6b186a73:2a0d4038:7c44c37a
    Number   Major   Minor   RaidDevice State
       1       8        0        0      active sync   /dev/sda
       0       8       16        1      active sync   /dev/sdb

What kind of raid is this?

Many thanks,
-T

[Bob Marčan]

On Wed, 05 Mar 2025 17:18:32 -0800
"ToddAndMargo via users"  wrote:
> Hi All,
>
> Well, the 11 year old server came down around the
> customer'w ears.  The motherboard went south.
> Got a new server on the way.
>
> The hard drives are healthy (raid1).   But can I mount
> one of the as a second drive to see data in the new
> server?
>
> Now this is embarrassing.  I forgot what kind of raid1
> I used.  RSTe maybe?
>
> Here is the print out I received from the raid
> checking program I wrote that I fire off every
> month:
>
> /dev/md126:
>          Container : /dev/md/imsm0, member 0
>         Raid Level : raid1

^^^

[ToddAndMargo]

On 3/5/25 5:45 PM, Bob Marčan via users wrote:
> > /dev/md126:
> >           Container : /dev/md/imsm0, member 0
> >          Raid Level : raid1
>                            ^^^

Not following you.

[Jeffrey Walton]

On Wed, Mar 5, 2025 at 9:12 PM ToddAndMargo via users
 wrote:
> On 3/5/25 5:45 PM, Bob Marčan via users wrote:
> > > /dev/md126:
> > >           Container : /dev/md/imsm0, member 0
> > >          Raid Level : raid1
> >                            ^^^
>
> Not following you.

He answered your question. You have RAID1. It is also called Disk Mirroring.

Jeff

[ToddAndMargo]

On 3/5/25 9:05 PM, Jeffrey Walton wrote:
> On Wed, Mar 5, 2025 at 9:12 PM ToddAndMargo via users
>  wrote:
> > On 3/5/25 5:45 PM, Bob Marčan via users wrote:
> > > > /dev/md126:
> > > >            Container : /dev/md/imsm0, member 0
> > > >           Raid Level : raid1
> > >                             ^^^
> >
> > Not following you.
>
> He answered your question. You have RAID1. It is also called Disk Mirroring.
>
> Jeff

Hi Jeff,

The question was what type of raid, not what level.
 From my original post:

Raid Level : raid1

Is this RSTe?  Software raid handled by the OS?
Or something else?

-T

[Patrick O'Callaghan]

On Wed, 2025-03-05 at 22:05 -0800, ToddAndMargo via users wrote:
> On 3/5/25 9:05 PM, Jeffrey Walton wrote:
> > On Wed, Mar 5, 2025 at 9:12 PM ToddAndMargo via users
> >  wrote:
> > > On 3/5/25 5:45 PM, Bob Marčan via users wrote:
> > > > > /dev/md126:
> > > > >            Container : /dev/md/imsm0, member 0
> > > > >           Raid Level : raid1
> > > >                             ^^^
> > >
> > > Not following you.
> >
> > He answered your question. You have RAID1. It is also called Disk Mirroring.
> >
> > Jeff
>
> Hi Jeff,
>
> The question was what type of raid, not what level.
>  From my original post:
>   Raid Level : raid1
>
> Is this RSTe?  Software raid handled by the OS?
> Or something else?

It seems quite clearly to be mdraid, given the device path.

poc

[Ian Pilcher]

On 3/5/25 7:18 PM, ToddAndMargo via users wrote:
> /dev/md126:
>          Container : /dev/md/imsm0, member 0

^^^^
IMSM is "Intel Matrix Storage Manager," which is a "BIOS RAID" (aka
fake RAID) implementation.

[ToddAndMargo]

On 3/6/25 7:53 AM, Ian Pilcher wrote:
> On 3/5/25 7:18 PM, ToddAndMargo via users wrote:
> > /dev/md126:
> >          Container : /dev/md/imsm0, member 0
>
> ^^^^
> IMSM is "Intel Matrix Storage Manager," which is a "BIOS RAID" (aka
> fake RAID) implementation.

Thank you!  I do believe I vaguely remember configuring
the drives in BIOS RSTe.