Hallo, Hugo,
Du meintest am 09.05.12:
>>> mkfs.btrfs -m raid1 -d single should give you that.
>> Just a small bug, perhaps:
>>
>> created a system with
>>
>> mkfs.btrfs -m raid1 -d single /dev/sdl1
>> mount /dev/sdl1 /mnt/Scsi
>> btrfs device add /dev/sdk1 /mnt/Scsi
>> btrfs device add /dev/sdm1 /mnt/Scsi
>> (filling with data)
>>
>> and
>>
>> btrfs fi df /mnt/Scsi
>>
>> now tells
>>
>> Data, RAID0: total=183.18GB, used=76.60GB
>> Data: total=80.01GB, used=79.83GB
>> System, DUP: total=8.00MB, used=32.00KB
>> System: total=4.00MB, used=0.00
>> Metadata, DUP: total=1.00GB, used=192.74MB
>> Metadata: total=8.00MB, used=0.00
>>
>> --------------------------------------
>>
>> "Data, RAID0" confuses me (not very much ...), and the system for
>> metadata (RAID1) is not told.
> DUP is two copies of each block, but it allows the two copies to
> live on the same device. It's done this because you started with a
> single device, and you can't do RAID-1 on one device. The first bit
> of metadata you write to it should automatically upgrade the DUP
> chunk to RAID-1.
Ok.
Sounds familiar - have you explained that to me many months ago?
> As to the spurious "upgrade" of single to RAID-0, I thought Ilya
> had stopped it doing that. What kernel version are you running?
3.2.9, self made.
I could test the message with 3.3.4, but not today (if it's only an
interpretation of always the same data).
> Out of interest, why did you do the device adds separately,
> instead of just this?
a) making the first 2 devices: I have tested both versions (one line
with 2 devices or 2 lines with 1 device); no big difference.
But I had tested the option "-L" (labelling) too, and that makes shit
for the oneliner: both devices get the same label, and then "findfs"
finds none of them.
The really safe way would be: deleting this option for the "mkfs.btrfs"
command and only using
btrfs fi label <device> [<newlabel>]
b) third device: that's my usual test:
make a cluster of 2 deivces
fill them with data
add a third device
delete the smallest device
Viele Gruesse!
Helmut
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