* slowdown after one week
@ 2015-07-11 6:46 Stefan Priebe
2015-07-13 11:20 ` Austin S Hemmelgarn
0 siblings, 1 reply; 3+ messages in thread
From: Stefan Priebe @ 2015-07-11 6:46 UTC (permalink / raw)
To: linux-btrfs@vger.kernel.org
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: slowdown after one week
2015-07-11 6:46 slowdown after one week Stefan Priebe
@ 2015-07-13 11:20 ` Austin S Hemmelgarn
2015-07-13 12:54 ` Stefan Priebe - Profihost AG
0 siblings, 1 reply; 3+ messages in thread
From: Austin S Hemmelgarn @ 2015-07-13 11:20 UTC (permalink / raw)
To: Stefan Priebe, linux-btrfs@vger.kernel.org
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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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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: slowdown after one week
2015-07-13 11:20 ` Austin S Hemmelgarn
@ 2015-07-13 12:54 ` Stefan Priebe - Profihost AG
0 siblings, 0 replies; 3+ messages in thread
From: Stefan Priebe - Profihost AG @ 2015-07-13 12:54 UTC (permalink / raw)
To: Austin S Hemmelgarn, linux-btrfs@vger.kernel.org
Am 13.07.2015 um 13:20 schrieb Austin S Hemmelgarn:
> 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.
>
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.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2015-07-11 6:46 slowdown after one week Stefan Priebe
2015-07-13 11:20 ` Austin S Hemmelgarn
2015-07-13 12:54 ` Stefan Priebe - Profihost AG
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