Hallo, Hugo,
Du meintest am 09.05.12:
>>> 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.
> OK, I'm pretty sure that's too old -- it will "upgrade" single to
> RAID-0. You can probably turn it back to "single" using balance
> filters:
> # btrfs fi balance -dconvert=single /mountpoint
> (You may want to write at least a little data to the FS first --
> balance has some slightly odd behaviour on empty filesystems).
"manana" ... the system is just running "balance" after "device delete".
And that may still need 4 ... 5 hours.
>>> 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.
> Umm... Yes, of course both devices will get the same label --
> you're labelling the filesystem, not the devices. (Didn't we have
> this argument some time ago?).
Not with that special case (and that led me to misinterpreting the error
...).
> I don't know what "findfs" is doing, that it can't find the
> filesystem by label: you may need to run "sync" after mkfs, possibly.
No - "findfs" works quite simple: if it finds 1 label then it tells the
partition.
If it finds more or less labels it tells nothing.
>> 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
> What are you testing? And by "delete" do you mean "btrfs dev
> delete" or "pull the cable out"?
First pure software delete. Tomorrow I'll reboot the system and look at
the results with
btrfs fi show
It should tell only 2 devices (that's the part which seems to work as
described at least since kernel 3.2).
By the way: it seems to be necessary running
btrfs fi balance ...
after "btrfs device add ..." and after "btrfs device delete ...".
Viele Gruesse!
Helmut
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