Topic: Migrate 7.5.1 to 8 using old internal drive for 'restore'

[ReetP]

In the process of testing an upgrade from 7.5.1 to 8

I wanted to upgrade the disks at the same time (USB is slow compared, and I don't have a USB disk big enough to do the backup) and remembered doing something similar before - see links below.

I did a new install of 8b6, signal-event pre-backup on the old disks, removed one and inserted it in the new box.

However, following this process doesn't seem to work as follows :

mdadm -AR /dev/md5 /dev/hdc2
mdadm: no devices found for /dev/md5

Anyone have any ideas ?

B. Rgds
John

http://forums.contribs.org/index.php?topic=39892.0
http://forums.contribs.org/index.php?topic=37686.0
http://wiki.contribs.org/UpgradeDisk

[ReetP]

Hmmm.

Tried it again.

mdadm --examine --scan reveals :

ARRAY /dev/md1 level=raid1 num-devices=2 UUID=e612cfc4 etc
ARRAY /dev/md2 level=raid1 num-devices=2 UUID=558aae94 etc

I guess this is the old array information read from the drive that is plugged in.

I only have one drive and a CDrom in the machine and have checked I am using the correct drive - /dev/hdc

I am using the V8b6 boot CD and rescue mode

Has something changed with mdadm or lvm ?

Wondering if I ought to try & rename the LVM with a SME 7 disk ???

Any help gratefully received. I'm not sure this qualifies as a bug - perhaps someone can advise whether it should go in the tracker ?

[Stefano]

IMHO, if you are going to upgrade your hw too (i.e. use a new server) you should take a look at Affa

my 2c

[Stefano]

Any help gratefully received. I'm not sure this qualifies as a bug - perhaps someone can advise whether it should go in the tracker ?

sure.. please report it in bugzilla and link here the reference, thank you

[ReetP]

Hi Stefano, thanks for the replies.

Bug filed : http://bugs.contribs.org/show_bug.cgi?id=6195

I didn't want to use another contrib if I could help it. Affa also requires a backup server, which I don't have.

For the sake of the thread, I booted with a 7.5.1 CD and one disk only. I then followed the Wiki to rename the volume.

I then rebooted with the new drives and the one old drive and followed the Wiki to mount the drive. It is currently copying over - my guess (TBC) that it is probably OK as I could see all the data.

My guess is that something has changed with mdadm between V7 & V8

Will post back when it has finished copying to confirm whether it has worked

B. Rgds
John

[ReetP]

All moved over finally. Biggest sticking point was some errors in some files - presumably from a early problem that I had never picked up. I had to fsck the old drive and remove the errors. Once that was done, it copied easily.

[ReetP]

Notes have been added here :

http://wiki.contribs.org/UpgradeDisk

[christian]

Notes have been added here :

http://wiki.contribs.org/UpgradeDisk

Thank you for documenting this. I think you just saved me and others a tonne of grief. This is my generally preferred method of upgrading my disks.

[ReetP]

Thank you for documenting this. I think you just saved me and others a tonne of grief. This is my generally preferred method of upgrading my disks.

No worries. Me too. Just wish someone had been there before me !! Cost me quite a few hours

B. Rgds
John

[SuperGrover]

Hi,

I will try to perform the same steps, but if it is not working, do I need to undo the signal-event pre-backup command, or will it be undone by booting from that disk?

Thanks,

SuperGrover

[janet]

SuperGrover

...do I need to undo the signal-event pre-backup command...

No.
It does not need to be undone. It just dumps the mysql database ready for backup (or restore in this case). It will be overwritten & deleted next time you peform a backup.

[ReetP]

It does not need to be undone. It just dumps the mysql database ready for backup (or restore in this case). It will be overwritten & deleted next time you peform a backup.

Thanks Mary - you beat me too it !

B. Rgds
John

[cactus]

It will be overwritten & deleted next time you peform a backup.

No, deleted and freshly dumped, to be precise.

[janet]

cactus

No, deleted and freshly dumped, to be precise.

Which I think is equivalent to being overwritten, ........and then deleted at the end of the backup IIRC.

[SuperGrover]

Hi there (again),

yesterday I received my 2 new sata disks so I did the following.

On the existing 7.5.1 installation on a PATA drive, I attached one of the new SATA disks to sync it with the current installation.

After syncing, I took this disk and hooked it up to a different computer running a freshly installed SME 7.5.1

I used the upgradedisk commands and that all looked fine.

But, a lot of my information is lost. All /opt files (squeezeboxmusic, torrentflux etc.) are not copied, and also the contribs are not there.

Before I tried the Affa method, but the rpms_missing file was completely empty, so this also didn't help me a lot.

To be short, how can I easily change the current 1 disk PATA installation to a 1 disk SATA installation without all these problems. This shouldn't be this hard in my opinion, this way the software RAID of SME server over 1 PATA and 1 SATA disk is useless, because the machine won't boot from the 'backup' disk.

Hopefully somebody can help me to get it fixed, or point me to a topic which I can use.