Moving RAID 1 array to new server

Moving RAID 1 array to new server

[Jean-Rene Cormier]

I just moved my RAID 1 array to a new server and I did the mistake of
moving only one disk at first to make sure that I would still have a
copy on the other server in case the new one couldn't read the array for
some reason. When I added the second disk it mark it as faulty or
something so I tried to remove it from the array and re-add it but it
added a spare drive instead. So now my array is running in degraded
mode, what can I do to so the second drive resync with the other one?

Here's the output of mdadm --detail /dev/md0:

/dev/md0:
        Version : 00.90.00
  Creation Time : Sat Mar  1 22:55:38 2003
     Raid Level : raid1
     Array Size : 60051456 (57.27 GiB 61.49 GB)
    Device Size : 60051456 (57.27 GiB 61.49 GB)
   Raid Devices : 2
  Total Devices : 1
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Mon Nov 10 16:50:06 2003
          State : dirty, no-errors
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 1


    Number   Major   Minor   RaidDevice State
       0      33        1        0      active sync   /dev/hde1
       1       0        0        1      faulty removed
           UUID : 97cdd679:0b676ca4:3d889120:566d5967
         Events : 0.27


Jean-Rene Cormier

Re: Moving RAID 1 array to new server

[Juri Haberland]

Jean-Rene Cormier <jrc@vgmidi.com> wrote:
> I just moved my RAID 1 array to a new server and I did the mistake of
> moving only one disk at first to make sure that I would still have a
> copy on the other server in case the new one couldn't read the array for
> some reason. When I added the second disk it mark it as faulty or
> something so I tried to remove it from the array and re-add it but it
> added a spare drive instead. So now my array is running in degraded
> mode, what can I do to so the second drive resync with the other one?

It should work work with something like this:

mdadm --manage /dev/md0 --add /dev/hdXy

where hdXy ist the partition you want to add.

Cheers,
Juri

-- 
Juri Haberland  <juri@koschikode.com> 

Re: Moving RAID 1 array to new server

[Jean-Rene Cormier]

On Tue, 2003-11-11 at 15:29, Juri Haberland wrote:
> Jean-Rene Cormier <jrc@vgmidi.com> wrote:
> > I just moved my RAID 1 array to a new server and I did the mistake of
> > moving only one disk at first to make sure that I would still have a
> > copy on the other server in case the new one couldn't read the array for
> > some reason. When I added the second disk it mark it as faulty or
> > something so I tried to remove it from the array and re-add it but it
> > added a spare drive instead. So now my array is running in degraded
> > mode, what can I do to so the second drive resync with the other one?
> 
> It should work work with something like this:
> 
> mdadm --manage /dev/md0 --add /dev/hdXy
> 
> where hdXy ist the partition you want to add.

I believe that's what I did but it added it as a spare drive. I'll try
it again tomorrow and see what it does.

Jean-Rene Cormier

Re: Moving RAID 1 array to new server

[Dick Streefland]

Jean-Rene Cormier <jean-rene.cormier@cipanb.ca> wrote:
| I believe that's what I did but it added it as a spare drive. I'll try
| it again tomorrow and see what it does.

Perhaps you need this patch:

  http://www.spinics.net/lists/raid/msg03627.html

-- 
Dick Streefland                      ////                      Altium BV
dick.streefland@altium.nl           (@ @)          http://www.altium.com
--------------------------------oOO--(_)--OOo---------------------------

Re: Moving RAID 1 array to new server

[Juri Haberland]

Dick Streefland <spam@altium.nl> wrote:
> Jean-Rene Cormier <jean-rene.cormier@cipanb.ca> wrote:
> | I believe that's what I did but it added it as a spare drive. I'll try
> | it again tomorrow and see what it does.
> 
> Perhaps you need this patch:
> 
>   http://www.spinics.net/lists/raid/msg03627.html

Where did he say that he uses 2.6?

Cheers,
Juri

-- 
Juri Haberland  <juri@koschikode.com> 

Re: Moving RAID 1 array to new server

[Jean-Rene Cormier]

On Wed, 2003-11-12 at 15:58, Juri Haberland wrote:
> Dick Streefland <spam@altium.nl> wrote:
> > Jean-Rene Cormier <jean-rene.cormier@cipanb.ca> wrote:
> > | I believe that's what I did but it added it as a spare drive. I'll try
> > | it again tomorrow and see what it does.
> > 
> > Perhaps you need this patch:
> > 
> >   http://www.spinics.net/lists/raid/msg03627.html
> 
> Where did he say that he uses 2.6?

I use 2.4.22 so I guess this patch is not for me. When I get home
tonight I'll try to re-add the disk to the array and see what it does.

Jean-Rene Cormier

Re: Moving RAID 1 array to new server

[Juri Haberland]

Jean-Rene Cormier <jean-rene.cormier@cipanb.ca> wrote:
> On Wed, 2003-11-12 at 15:58, Juri Haberland wrote:

> I use 2.4.22 so I guess this patch is not for me. When I get home
> tonight I'll try to re-add the disk to the array and see what it does.

If it doesn't work please also post the relevant part of /proc/mdstat.

Cheers,
Juri

-- 
Juri Haberland  <juri@koschikode.com> 

Re: Moving RAID 1 array to new server

[Jean-Rene Cormier]

On Wed, 2003-11-12 at 16:06, Juri Haberland wrote:
> Jean-Rene Cormier <jean-rene.cormier@cipanb.ca> wrote:
> > On Wed, 2003-11-12 at 15:58, Juri Haberland wrote:
> 
> > I use 2.4.22 so I guess this patch is not for me. When I get home
> > tonight I'll try to re-add the disk to the array and see what it does.
> 
> If it doesn't work please also post the relevant part of /proc/mdstat.


Well I re-added the drive and it marked it as a spare.

Here's the output of mdadm --detail /dev/md0:

/dev/md0:
        Version : 00.90.00
  Creation Time : Sat Mar  1 22:55:38 2003
     Raid Level : raid1
     Array Size : 60051456 (57.27 GiB 61.49 GB)
    Device Size : 60051456 (57.27 GiB 61.49 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Wed Nov 12 22:33:37 2003
          State : dirty, no-errors
 Active Devices : 1
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 2


    Number   Major   Minor   RaidDevice State
       0      33        1        0      active sync   /dev/hde1
       1       0        0        1      faulty removed
       2      34        1        2      spare   /dev/hdg1
           UUID : 97cdd679:0b676ca4:3d889120:566d5967
         Events : 0.30

And here's my /proc/mdstat:

Personalities : [raid1] [raid5]
read_ahead 1024 sectors
md0 : active raid1 hdg1[2] hde1[0]
      60051456 blocks [2/1] [U_]
      [=>...................]  recovery =  6.9% (4162176/60051456)
finish=30.2min speed=30762K/sec
unused devices: <none>

It seems to be rebuilding but will it stay marked as a spare drive or
will it take over the main faulty drive after it's done rebuilding?

Thanks

Jean-Rene Cormier

Re: Moving RAID 1 array to new server

[Jean-Rene Cormier]

On Wed, 2003-11-12 at 19:37, Jean-Rene Cormier wrote:
> On Wed, 2003-11-12 at 16:06, Juri Haberland wrote:
> > Jean-Rene Cormier <jean-rene.cormier@cipanb.ca> wrote:
> > > On Wed, 2003-11-12 at 15:58, Juri Haberland wrote:
> > 
> > > I use 2.4.22 so I guess this patch is not for me. When I get home
> > > tonight I'll try to re-add the disk to the array and see what it does.
> > 
> > If it doesn't work please also post the relevant part of /proc/mdstat.
> 
> 
> Well I re-added the drive and it marked it as a spare.

> It seems to be rebuilding but will it stay marked as a spare drive or
> will it take over the main faulty drive after it's done rebuilding?
> 

Well the array just finished syncing and both drive are marked as active
sync without any spare drive so I guess it answered my question.

Thanks

Jean-Rene Cormier

Re: Moving RAID 1 array to new server

[Jean-Rene Cormier]

On Wed, 2003-11-12 at 22:08, Neil Brown wrote:
> On  November 12, jean-rene.cormier@cipanb.ca wrote:
> > And here's my /proc/mdstat:
> > 
> > Personalities : [raid1] [raid5]
> > read_ahead 1024 sectors
> > md0 : active raid1 hdg1[2] hde1[0]
> >       60051456 blocks [2/1] [U_]
> >       [=>...................]  recovery =  6.9% (4162176/60051456)
> > finish=30.2min speed=30762K/sec
> > unused devices: <none>
> > 
> > It seems to be rebuilding but will it stay marked as a spare drive or
> > will it take over the main faulty drive after it's done rebuilding?
> > 
> 
> Wait 30.2 minutes and see?
> It should mark it as a fully active drive, no longer spare.

It just finished and it's marked as fully active now, it was the first
time I had a to resync an array so I didn't knew how it worked.

Jean-Rene Cormier

Re: Moving RAID 1 array to new server

[Neil Brown]

On  November 12, jean-rene.cormier@cipanb.ca wrote:
> And here's my /proc/mdstat:
> 
> Personalities : [raid1] [raid5]
> read_ahead 1024 sectors
> md0 : active raid1 hdg1[2] hde1[0]
>       60051456 blocks [2/1] [U_]
>       [=>...................]  recovery =  6.9% (4162176/60051456)
> finish=30.2min speed=30762K/sec
> unused devices: <none>
> 
> It seems to be rebuilding but will it stay marked as a spare drive or
> will it take over the main faulty drive after it's done rebuilding?
> 

Wait 30.2 minutes and see?
It should mark it as a fully active drive, no longer spare.

NeilBrown