Re: slowdown after one week

Austin S Hemmelgarn <ahferroin7@xxxxxxxxx> · Mon, 13 Jul 2015 07:20:48 -0400

On 2015-07-11 02:46, Stefan Priebe wrote:
Hi,

while using a 40TB btrfs partition for VM backups. I see a massive
slowdown after around one week.

The backup task takes usally 2-3 hours. After one week it takes 20
hours. If i umount and remount the btrfs volume it takes 2-3 hours again.

Kernel 4.1.1

I've been seeing similar (although much less drastic) slowdowns over 
time myself pretty much since I started using BTRFS (IIRC, sometime 
around 3.16).  If you're not constantly writing to that backup volume, 
you might want to consider setting up automounting for it.

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