1 week to rebuid 4x 3TB raid10 is a long time!

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Hi,

I have a raid10 with 4x 3TB disks on a microserver
http://n40l.wikia.com/wiki/Base_Hardware_N54L , 8Gb RAM

Recently one disk started to fail (smart errors), so I replaced it
Mounted as degraded, added new disk, removed old
Started yesterday
I am monitoring /var/log/messages and it seems it will take a long time
Started at about 8010631739392
And 20 hours later I am at 6910631739392 
btrfs: relocating block group 6910631739392 flags 65

At this rate it will take a week to complete the raid rebuild!!!

Furthermore it seems that the operation is getting slower and slower
When the rebuild started I had a new message every half a minute, now it’s
getting to OneAndHalf minutes
Most files are small files like flac/jpeg

One week for a raid10 rebuild 4x3TB drives is a very long time.
Any thoughts?
Can you share any statistics from your RAID10 rebuilds?

If I shut down the system, before the rebuild, what is the proper procedure
to remount it? Again degraded? Or normally? Can the process of rebuilding
the raid continue after a reboot? Will it survive, and continue rebuilding?

Thanks in advance
TM


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