Consider using RAID1C3 or RAID1C4 (if you have 4 devices) for metadata. Then if one device fails, you at least will be able to access the content on the remaining devices.
Hi arvidjaar,
Many thanks for this suggestion. I shall have to read up on btrfs. I have RAID arrays of hard drives but have never considered RAID on btrfs.
The obvious question for me is can I build such an array without losing existing data?
Thanks again,
Yes, you can.
Many thanks. The new chips arrived and are installed and added to btrfs. The initial balance, which will take a while, is now running.
One observation, I noticed that my original chip is NV1, the new ones are NV3. I assume that the performance will be controlled by the lowest common denominator here, ie NV1 but would appreciate comments.
Thanks again.
Hi arvidjaar, you mentioned RAID and I was thinking of using RAID 5 so I tried running the command
sudo btrfs balance start -dconvert=raid5 -mconvert=raid1 /
I get the warning:-
alastair@HP-Z640-1:~> sudo btrfs balance start -dconvert=raid5 -mconvert=raid1 /
WARNING:
RAID5/6 support has known problems and is strongly discouraged
to be used besides testing or evaluation. It is recommended that
you use one of the other RAID profiles.
The operation will continue in 10 seconds.
Use Ctrl-C to stop.
10 9 8 7 6 5 4^C
alastair@HP-Z640-1:~>
I stopped here and would appreciate your views.
On further reflection I am thinking of this as the compromise:-
sudo btrfs balance start -dconvert=raid0 -mconvert=raid1 /
Again, grateful for your opinion.
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