slowdown after one week
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
Greets,
Stefan
Quoted 10 lines · Stefan Priebe
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.
Am 13.07.2015 um 13:20 schrieb Austin S Hemmelgarn:
Quoted 9 lines · Stefan Priebe
Quoted 8 lines
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.
Quoted 7 lines
Quoted 2 lines
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.
Yes but that's awful. it's a bug. It would be very nice if someone involved in the btrfs development can comment on that one.