Is parralel device remove possible ?

["Ondřej Kunc" <ondrej.kunc@ignum.cz>]

Hi,

I'm just removing about 8 drives from btrfs pool and I issued this command:

btrfs dev del /dev/sd[bmghkqps]

According to munin graphs it is removing drives sequentially and ... I 
can see it is reading that drive which it is actually removing ... but 
it is doing big writes(so it is probably moving data there) to other 
drives which will be removed later.

Would it be possible to do this in parallel ... to restrict next writing 
to drives to fasten this operation ?

Now it is running about 3 days and it has removed 5 drives.

And second question ... is there way how to see progress of drive 
removing ? In  dmesg I can see relocating block group ... and the number 
of group is decreasing ... but sometimes it changes direction, so it 
doesn't provide so useful estimation.

Thanks,

Ondřej

-- 
S pozdravem,

Ondřej Kunc, Senior Linux Administrator

IGNUM s.r.o., Vinohradská 190, Praha 3, 130 61, CZE
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