Changes

== Using a third drive ==

== Using a third drive ==

 

I have just repeated the exercise and it seems to work OK. It was much easier having a third drive. Mark the drives so you know what each contains! I will refer to them as A, B & C - substitute the relevant drive paths accordingly.

I have just repeated the exercise and it seems to work OK. It was much easier having a third drive. Mark the drives so you know what each contains ! I will refer to them as A, B & C - substitute the relevant drive paths accordingly.

 

 

I did the following :

I did the following :

 

*Added the third drive (C) as a hot spare - see : http://wiki.contribs.org/Raid#Adding_another_Hard_Drive_Later

 

*Stop the machine, remove one drive (B) and restart - this makes the array 'fail' and the hot spare will be added to the array and mirrored. Run the pre-backup for (A) & (C). Stop the machine.

Added the third drive (C) as a hot spare - see : http://wiki.contribs.org/Raid#Adding_another_Hard_Drive_Later

*Remove the SME7 drives (A) & (C). Install SM8 on the first pulled drive (B) and apply any updates.

 

*Stop the machine. Pull the original disk (A) and store it out of the way - you can always get yourself back with this drive. It is better to save (A) as (C) may not have a boot partition correctly installed - see the notes on adding a hot spare : http://forums.contribs.org/index.php/topic,38041.msg171631.html#msg171631

 

*Reboot with an SME7 CD (see above for details) and the 'new' drive (C) and rename the LVM on it as detailed above.

Stop the machine, remove one drive (B) and restart - this makes the array 'fail' and the hot spare will be added to the array and mirrored. Run the pre-backup for (A) & (C). Stop the machine.

*Stop the machine. Plug in the disk with SME8 (B) and the disk with SME7 (C). Boot from the SME8 disk (B). Mount the LVM on the SME7 disk (C) as above and restore from disk (C).

 

*Check that the data has copied over OK, format disk (C) to wipe the old system and then add it to the SME 8 Array.

 

*Finally once you are happy everything is working add back Disk (A)

Remove the SME7 drives (A) & (C). Install SM8 on the first pulled drive (B) and apply any updates.

 

 

Stop the machine. Pull the original disk (A) and store it out of the way - you can always get yourself back with this drive. It is better to save (A) as (C) may not have a boot partition correctly installed - see the notes on adding a hot spare : http://forums.contribs.org/index.php/topic,38041.msg171631.html#msg171631

 

 

Reboot with an SME7 CD (see above for details) and the 'new' drive (C) and rename the LVM on it as detailed above

 

 

Stop the machine. Plug in the disk with SME8 (B) and the disk with SME7 (C). Boot from the SME8 disk (B). Mount the LVM on the SME7 disk (C) as above and restore from disk (C).

 

 

Check that the data has copied over OK, format disk (C) to wipe the old system and then add it to the SME 8 Array.

 

 

Finally once you are happy everything is working add back Disk (A)

==Recovering a system where pre-backup could not be run==

==Recovering a system where pre-backup could not be run==