Joseph,
On 08/09/2013 05:35 PM, Johan Schiff wrote:
Hi Joseph.
You might want to check the 'quick reference' in the English Wikipedia
article on mdadm.
http://en.m.wikipedia.org/wiki/Mdadm
If you're doing software raid, that should be all you need. Basically,
you start by making a two disk array with your current /home disk and
one missing. Then you add the new disk, and it syncs automatically.
Den 9 aug 2013 06:35 skrev "Joseph Bishay" <joseph.bis...@gmail.com
<mailto:joseph.bis...@gmail.com>>:
Good day everyone,
I hope you are all doing well.
Our LTSP server is running Edubuntu and has been running flawlessly
for a while now. I'd like to add some redundancy to the server by
adding a second hard drive to mirror /home.
The current setup is:
One SSD drive for /
One SATA 1 TB drive for /home
I'd like to add a second 1 TB SATA drive and then have it
automagically copy the files over and then have them running as RAID 1
for /home, all with minimal downtime :)
Does anyone have any tips or guidelines I could follow from your
experiences?
Thank you!
Joseph
I would recommend putting the system drive on a RAID 1 and backup your
/home partition. If something happens to that SSD the system will go
down, however if something happens to the /home directory you could
simply revert to your backup. Building a system takes much longer.
My LTSP setup is now using a software RAID 1 (mdadm) with a LVM on top
of that which gives me the ability to take snapshots when doing upgrades
or anything risky. Taking snapshots with LVM is simple and quick and can
be done on a live system. You can use that snapshot to take a backup of
a live system without reboot and you can revert back to a snapshot
quickly using the command 'lvconvert --merge'.
If you do decide to go down this path leave 300MB at the front of the
RAID1 for the /boot partition as you don't need that in the LVM.
Here is the full documentation of how I setup my drives in the Debian 7
installer:
Within the installation of Debian at the Partition disks screen;
1. select 'manual'
2. Hit enter on each drive and create a 'partition table'
3. Create boot partitions on both disks
| Size | 0.3GB |
| Type | Primary |
| Location | Beginning |
| Use as: | RAID |
| Bootable | On |
4. Create main partitions with the rest on both disks
| Size | <the rest> |
| Type | Primary |
| Location | Beginning |
| Use as: | RAID |
| Bootable | Off |
5. Create boot RAID
| Write changes? | Yes |
- Click 'Create MD device'
| RAID type | RAID 1 |
| Number of active devices | 2 |
| Number of spare | 0 |
- Select both small devices
- Click continue
6. Create main RAID
| Write changes? | Yes |
- Click 'Create MD device'
| RAID type | RAID 1 |
| Number of active devices | 2 |
| Number of spare | 0 |
- Select both large devices
- Click continue
- Click Finish
7. Click on RAID1 298MB partition
| Use as | ext3 |
| mount point | /boot |
- Click Done
8. Click on RAID1 Larger partition
| Use as | physical volume for LVM |
- Click Done
9. Configure the Logical Volume Manager
- Write the changes? Yes
- Create volume group
- Name volume group 'vg.lvm.sol'
- Select the larger RAID
10. Create logical volumes
- Select vg.lvm.sol
- Create the following volumes
| root | 30GB | |
| rootbak | 20GB | Used for snapshots |
| home | <the rest> | |
- Click Finish
11. Click on LVM LV root volume
| Use as | ext4 |
| Mount | / |
| Mount options | noatime |
- Click Done
12. Click on LVM LV rootbak volume
| Use as | ext4 |
| Mount | NONE |
| Mount options | noatime |
- Click Done
13. Click on LVM LV home volume
| Use as | ext4 |
| Mount | /home |
| Mount options | noatime |
- Click Done
14. Click Finish partitioning
15. (optional) Do you want to return to the partitioning menu? No
This is due to the fact that I don't currently have swap setup
16. Write the changes to disks? Yes
My reference: http://www.youtube.com/watch?v=ZZbexPrfnzQ
I do a system & data backup every night.
System backup is done like so;
- snapshot
- use fsarchiver to create a backup from snapshot
- remove snapshot of root.
Data backups are done using 'dar' as it keeps all the permissions, has
compression, splices, available on 'system rescue cd', has encryption
and you can retrieve files fast as it's direct access.
I use two Samsung 840 pro 512GB drives in a RAID 1 and put the boot,
root & home partitions on it.
Hope this helps you.
from
Mick
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