Re: Recovering data from a Raid 1Sata HD

[tomas]

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On Sun, Dec 27, 2015 at 02:48:45PM +0100, Pascal Hambourg wrote:
> to...@tuxteam.de a écrit :
> > 
> > On Wed, Dec 23, 2015 at 07:41:00AM -0300, Renaud OLGIATI wrote:
> > 
> >> Or do I have to first create a (failed) array with mdadm ?
> > 
> > For RAID 1 it shouldn't be necessary, AFAIR
> 
> You cannot mount directly a RAID 1 partition with format 1.1 or 1.2
> because the RAID superblock gets in the way. You must mount it with
> loop,offset (see my other reply in this thread) or assemble it as a
> degraded array and mount the array.

Ah -- thanks. That was the missing piece. Seems my RAID knowledge is
a bit rusty, sorry.

Regards
- -- tomás
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Re: Recovering data from a Raid 1Sata HD

[Pascal Hambourg]

to...@tuxteam.de a écrit :
> 
> On Wed, Dec 23, 2015 at 07:41:00AM -0300, Renaud OLGIATI wrote:
> 
>> Or do I have to first create a (failed) array with mdadm ?
> 
> For RAID 1 it shouldn't be necessary, AFAIR

You cannot mount directly a RAID 1 partition with format 1.1 or 1.2
because the RAID superblock gets in the way. You must mount it with
loop,offset (see my other reply in this thread) or assemble it as a
degraded array and mount the array.

Re: Recovering data from a Raid 1Sata HD

[Pascal Hambourg]

Felix Miata a écrit :
> 
> A RAID1 partition normally cannot be mounted as an sdX# device.

It can if the RAID superblock is located at the end of the partition.
I.e. the superblock format is 0.9 (obsolete) or 1.0.

However if the format is 1.1 or 1.2 (default), the superblock is located
at or near the beginning of the partitition and offsets the beginning of
the filesystem, preventing mount to identify it. But the filesystem can
still be mounted with loop, by specifying the offset.

Use "mdadm -E /dev/" to display the superblock format and the
data offset. I don't remember if the offset is in 512-byte sectors, KiB
or other unit. You must multiply the offet with the block size to get
the offset in bytes.

Then mount the filesystem with "-o loop,offset=".

Re: Recovering data from a Raid 1Sata HD

[Michał Giżyński]

Or do I have to first create a (failed) array with mdadm ?


Hi,
assemble fail raid first:
#mdadm -A /dev/mdX /dev/sdX /dev/sdY
then check status:
#cat /proc/mdstat
or
#mdadm --detail /dev/mdX
If mdam does not start then you could use -f (force).
After properly assembled raid you could mount it:
#mkdir /recover
#mount /dev/mdX /recover

Re: Recovering data from a Raid 1Sata HD

[tomas]

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On Wed, Dec 23, 2015 at 09:49:54AM -0300, Renaud OLGIATI wrote:
> On Wed, 23 Dec 2015 11:11:08 +
> Lisi Reisz  wrote:
> 
> > On Wednesday 23 December 2015 10:23:41 to...@tuxteam.de wrote:
> > > -BEGIN PGP SIGNED MESSAGE-
> > > Hash: SHA1
> > >
> > > On Wed, Dec 23, 2015 at 07:41:00AM -0300, Renaud OLGIATI wrote:
> > > > Given a Sata HD that was part of a RAID1 array on a now defunct Wheezy
> > > > system.
> > > >
> > > > Is there a way to mount it on another Wheezy system to recover the data 
> > > > ?
> > > >
> > > > I have tried to mount it, and get
> > > >
> > > > root@ron:/home/ron # mount -t ext4 /dev/sdi9 /media/eSata
> > > > mount: wrong fs type, bad option, bad superblock on /dev/sdi9,
> > > >missing codepage or helper program, or other error
> > > >In some cases useful info is found in syslog - try
> > > >dmesg | tail  or so
> > > >
> > > > What file type should I give for the -t param of mount ?
> 
> > > Try to omit the explicit file system ("-t ext4") in the mount
> > > invocation above: mount should be able to find out by itself --
> > > unless you positively know that ext4 is right.
> 
> > If it is demanding a file type, how about  "-t auto"?
> 
> root@ron:/home/ron # mount /dev/sdi9 /media/eSata
> mount: you must specify the filesystem type
> 
> root@ron:/home/ron # mount -t auto /dev/sdi9 /media/eSata
> mount: you must specify the filesystem type

That means mount can't guess what filesystem is on /dev/sdi9. I fear we
won't be better at it. But you could try something like:

  sudo dd if=/dev/sdi9 bs=1024 count=1 | file -

Perhaps 'file' can shed some light onto it (it doesn't always)

Regards
- -- tomás
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Re: Recovering data from a Raid 1Sata HD

[Ron]

On Wed, 23 Dec 2015 13:33:22 +0100
 wrote:

> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
> 
> On Wed, Dec 23, 2015 at 09:49:54AM -0300, Renaud OLGIATI wrote:
> > On Wed, 23 Dec 2015 11:11:08 +
> > Lisi Reisz  wrote:
> > 
> > > On Wednesday 23 December 2015 10:23:41 to...@tuxteam.de wrote:
> > > > -BEGIN PGP SIGNED MESSAGE-
> > > > Hash: SHA1
> > > >
> > > > On Wed, Dec 23, 2015 at 07:41:00AM -0300, Renaud OLGIATI wrote:
> > > > > Given a Sata HD that was part of a RAID1 array on a now defunct Wheezy
> > > > > system.
> > > > >
> > > > > Is there a way to mount it on another Wheezy system to recover the 
> > > > > data ?
> > > > >
> > > > > I have tried to mount it, and get
> > > > >
> > > > > root@ron:/home/ron # mount -t ext4 /dev/sdi9 /media/eSata
> > > > > mount: wrong fs type, bad option, bad superblock on /dev/sdi9,
> > > > >missing codepage or helper program, or other error
> > > > >In some cases useful info is found in syslog - try
> > > > >dmesg | tail  or so
> > > > >
> > > > > What file type should I give for the -t param of mount ?
> > 
> > > > Try to omit the explicit file system ("-t ext4") in the mount
> > > > invocation above: mount should be able to find out by itself --
> > > > unless you positively know that ext4 is right.
> > 
> > > If it is demanding a file type, how about  "-t auto"?
> > 
> > root@ron:/home/ron # mount /dev/sdi9 /media/eSata
> > mount: you must specify the filesystem type
> > 
> > root@ron:/home/ron # mount -t auto /dev/sdi9 /media/eSata
> > mount: you must specify the filesystem type
> 
> That means mount can't guess what filesystem is on /dev/sdi9. I fear we
> won't be better at it. But you could try something like:
> 
>   sudo dd if=/dev/sdi9 bs=1024 count=1 | file -
> 
> Perhaps 'file' can shed some light onto it (it doesn't always)

Thank, but I fear I remain un-enlightened:

root@ron:/home/ron # dd if=/dev/sdi9 bs=1024 count=1 | file -
1+0 records in
1+0 records out
1024 bytes (1.0 kB) copied, 0.000693701 s, 1.5 MB/s
/dev/stdin: data

Cheers,
 
Ron.
-- 
  One seldom sees a monument to a committee.

   -- http://www.olgiati-in-paraguay.org --
 

Re: Recovering data from a Raid 1Sata HD

[Himanshu Shekhar]

At the end, if all methods will fail, you could really try testdisk, it's
free.
You could go for other commercial options too, depending upon the necessity
of the data.

Regards
Himanshu Shekhar

Re: Recovering data from a Raid 1Sata HD

[Bob Weber]

Yes you can mount the single raid1 disk.  Your wheezy system should have
recognized your drive as a md device when booted.  Run the commend 'cat
/proc/mdstat'.  It will show you the current md devices and their status.  This
is what I get after connecting a drive to my system over a usb connection.  It
added drives /dev/sdg[1-3] to my system drive list (ls /dev/sd*).  I had to
assemble the drive partitions into md devices with the commands 'mdadm
--assemble /dev/md5 /dev/sdg1', 'mdadm --assemble /dev/md6 /dev/sdg2' and 'mdadm
--assemble /dev/md7 /dev/sdg3'.

cat /proc/mdstat
Personalities : [raid1]
md7 : active (auto-read-only) raid1 sdg3[3]
  211690544 blocks super 1.2 [3/1] [__U]
 
md6 : active (auto-read-only) raid1 sdg2[3]
  1048564 blocks super 1.2 [3/1] [__U]
 
md5 : active (auto-read-only) raid1 sdg1[3]
  31456184 blocks super 1.2 [3/1] [__U]
 
md2 : active raid1 sda3[3] sdb3[5]
  938881600 blocks super 1.2 [2/2] [UU]
 
md1 : active raid1 sda2[3] sdb2[5]
  4192192 blocks super 1.2 [2/2] [UU]
 
md0 : active raid1 sda1[0] sdb1[1]
  33554368 blocks [2/2] [UU]
 
unused devices: 

Where my original system devices are md0, md1 and md2.  You will also see that
this is a degraded array with the notation [3/1] [__U] which means that the
original array had 3 drives and now has one.

If you have just booted the system with the drive connected it may have
assembled the md devices for you.  Look for the drive partitions for the old
drive and you will see the md device your system has assigned to it.  It might
me something like /dev/md127, /dev/md126 and so on depending on how many
partitions the drive has. 

Now mount the array with 'mount /dev/md5 /mnt/src' after creating the directory
/mnt/src first.  Of course your device names and drive names will be different. 
If the original array device was a swap partition (as my md6 above is) it will
not mount.  Once you are finished and have unmounted the array you should stop
the array(s) with the command 'mdadm --stop /dev/md[5-7]'.  Warning ... of
course be careful and not try to stop the arrays your system is using.  I think
mdadm will warn you that the array is in use and cannot be stopped. 


Hope this helps.

...Bob

Re: Recovering data from a Raid 1Sata HD

[Ron]

On Wed, 23 Dec 2015 13:49:36 +0100
to...@tuxteam.de wrote:

> Now you might want to try
>   sudo e2fsck -n /dev/sdi9

Does not like it either:

root@ron:/home/ron # e2fsck -n /dev/sdi9
e2fsck 1.42.5 (29-Jul-2012)
ext2fs_open2: Bad magic number in super-block
e2fsck: Superblock invalid, trying backup blocks...
e2fsck: Bad magic number in super-block while trying to open /dev/sdi9

I suppose I'll have to go the mdadm way...   ;-3(
 
Cheers,
 
Ron.
-- 
  One seldom sees a monument to a committee.

   -- http://www.olgiati-in-paraguay.org --
 

Re: Recovering data from a Raid 1Sata HD

[Ron]

On Wed, 23 Dec 2015 11:11:08 +
Lisi Reisz  wrote:

> On Wednesday 23 December 2015 10:23:41 to...@tuxteam.de wrote:
> > -BEGIN PGP SIGNED MESSAGE-
> > Hash: SHA1
> >
> > On Wed, Dec 23, 2015 at 07:41:00AM -0300, Renaud OLGIATI wrote:
> > > Given a Sata HD that was part of a RAID1 array on a now defunct Wheezy
> > > system.
> > >
> > > Is there a way to mount it on another Wheezy system to recover the data ?
> > >
> > > I have tried to mount it, and get
> > >
> > > root@ron:/home/ron # mount -t ext4 /dev/sdi9 /media/eSata
> > > mount: wrong fs type, bad option, bad superblock on /dev/sdi9,
> > >missing codepage or helper program, or other error
> > >In some cases useful info is found in syslog - try
> > >dmesg | tail  or so
> > >
> > > What file type should I give for the -t param of mount ?

> > Try to omit the explicit file system ("-t ext4") in the mount
> > invocation above: mount should be able to find out by itself --
> > unless you positively know that ext4 is right.

> If it is demanding a file type, how about  "-t auto"?

root@ron:/home/ron # mount /dev/sdi9 /media/eSata
mount: you must specify the filesystem type

root@ron:/home/ron # mount -t auto /dev/sdi9 /media/eSata
mount: you must specify the filesystem type
 
> Or had you thought of a Live CD to help recover the data?

Will it mount better than my existing Wheezy ?
 
Cheers,
 
Ron.
-- 
I read Playboy for the same reason I read National Geographic.
 To see the sights I'm never going to visit.

   -- http://www.olgiati-in-paraguay.org --
 

Re: Recovering data from a Raid 1Sata HD

[Ron]

Given a Sata HD that was part of a RAID1 array on a now defunct Wheezy
system.

Is there a way to mount it on another Wheezy system to recover the data ?

I have tried to mount it, and get

root@ron:/home/ron # mount -t ext4 /dev/sdi9 /media/eSata
mount: wrong fs type, bad option, bad superblock on /dev/sdi9,
   missing codepage or helper program, or other error
   In some cases useful info is found in syslog - try
   dmesg | tail  or so


What file type should I give for the -t param of mount ?

Or do I have to first create a (failed) array with mdadm ?
 
Cheers,
 
Ron.
-- 
 What we do not understand we do not possess.
-- Goethe

   -- http://www.olgiati-in-paraguay.org --
 

Re: Recovering data from a Raid 1Sata HD

[tomas]

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On Wed, Dec 23, 2015 at 07:41:00AM -0300, Renaud OLGIATI wrote:
> Given a Sata HD that was part of a RAID1 array on a now defunct Wheezy
> system.
> 
> Is there a way to mount it on another Wheezy system to recover the data ?
> 
> I have tried to mount it, and get
> 
> root@ron:/home/ron # mount -t ext4 /dev/sdi9 /media/eSata
> mount: wrong fs type, bad option, bad superblock on /dev/sdi9,
>missing codepage or helper program, or other error
>In some cases useful info is found in syslog - try
>dmesg | tail  or so
> 
> 
> What file type should I give for the -t param of mount ?

The file system type the RAID 1 was originally working with.

Looking at dmesg, as suggested in mount's error message is a good
idea.

Try to omit the explicit file system ("-t ext4") in the mount
invocation above: mount should be able to find out by itself --
unless you positively know that ext4 is right.

> Or do I have to first create a (failed) array with mdadm ?

For RAID 1 it shouldn't be necessary, AFAIR

regards
- -- tomás
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Re: Recovering data from a Raid 1Sata HD

[Felix Miata]

Renaud (Ron) OLGIATI composed on 2015-12-23 07:41 (UTC-0300):

> Given a Sata HD that was part of a RAID1 array on a now defunct Wheezy
> system.

> Is there a way to mount it on another Wheezy system to recover the data ?

> I have tried to mount it, and get

> root@ron:/home/ron # mount -t ext4 /dev/sdi9 /media/eSata
> mount: wrong fs type, bad option, bad superblock on /dev/sdi9,
>missing codepage or helper program, or other error
>In some cases useful info is found in syslog - try
>dmesg | tail  or so

A RAID1 partition normally cannot be mounted as an sdX# device.

> What file type should I give for the -t param of mount ?

> Or do I have to first create a (failed) array with mdadm ?

It's probably enough to see what /dev/md* device(s) got created when you
attached it and mount an/the appropriate md device. The dmesg tail may give a
clue.
-- 
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/

Re: Recovering data from a Raid 1Sata HD

[Lisi Reisz]

On Wednesday 23 December 2015 10:23:41 to...@tuxteam.de wrote:
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> On Wed, Dec 23, 2015 at 07:41:00AM -0300, Renaud OLGIATI wrote:
> > Given a Sata HD that was part of a RAID1 array on a now defunct Wheezy
> > system.
> >
> > Is there a way to mount it on another Wheezy system to recover the data ?
> >
> > I have tried to mount it, and get
> >
> > root@ron:/home/ron # mount -t ext4 /dev/sdi9 /media/eSata
> > mount: wrong fs type, bad option, bad superblock on /dev/sdi9,
> >missing codepage or helper program, or other error
> >In some cases useful info is found in syslog - try
> >dmesg | tail  or so
> >
> >
> > What file type should I give for the -t param of mount ?
[snip]
> Try to omit the explicit file system ("-t ext4") in the mount
> invocation above: mount should be able to find out by itself --
> unless you positively know that ext4 is right.

If it is demanding a file type, how about  "-t auto"?

Or had you thought of a Live CD to help recover the data?

Lisi

Re: Recovering data from a Raid 1Sata HD

[Hans]

Am Montag, 21. Dezember 2015, 17:06:49 schrieb Renaud OLGIATI:
> Given a Sata HD that was part of a RAID1 array on a now defunct Wheezy
> system.
> 
> Is there a way to mount it on another Wheezy system to recover the data ?
> 
> Cheers,
> 
> Ron.
If it was Raid-1 , mirroring, you should be able to mount it as any harddrive 
in a linux system. I suggest, to put it as the only one into a computer and 
then start from a linux livefile system like TRK, Knoppix, GRML or whatever.

So it will not interfere with your system and you will have a completely 
preconfigured rescue system avaiilable.

Good luck!

Hans