Duncan <1i5t5.dun...@cox.net> schrieb:
[...]
Difficult to twist your mind around that but well explained. ;-)
> A snapshot thus looks much like a crash in terms of NOCOW file integrity
> since the blocks of a NOCOW file are simply snapshotted in-place, and
> there's already no checksumming or fi
Kai Krakow posted on Fri, 07 Feb 2014 23:26:34 +0100 as excerpted:
> So the question is: Do btrfs snapshots give the same guarantees on the
> filesystem level that write-barriers give on the storage level which
> exactly those processes rely upon? The cleanest solution would be if
> processes coul
Chris Murphy schrieb:
>
> On Feb 7, 2014, at 2:07 PM, Kai Krakow wrote:
>
>> Chris Murphy schrieb:
>>
If the database/virtual machine/whatever is crash safe, then the
atomic state that a snapshot grabs will be useful.
>>>
>>> How fast is this state fixed on disk from the time of t
Duncan <1i5t5.dun...@cox.net> schrieb:
>> The question here is: Does it really make sense to create such snapshots
>> of disk images currently online and running a system. They will probably
>> be broken anyway after rollback - or at least I'd not fully trust the
>> contents.
>>
>> VM images shou
On Feb 7, 2014, at 2:07 PM, Kai Krakow wrote:
> Chris Murphy schrieb:
>
>>> If the database/virtual machine/whatever is crash safe, then the
>>> atomic state that a snapshot grabs will be useful.
>>
>> How fast is this state fixed on disk from the time of the snapshot
>> command? Loosely spea
Chris Murphy schrieb:
>> If the database/virtual machine/whatever is crash safe, then the
>> atomic state that a snapshot grabs will be useful.
>
> How fast is this state fixed on disk from the time of the snapshot
> command? Loosely speaking. I'm curious if this is < 1 second; a few
> seconds;
Kai Krakow posted on Fri, 07 Feb 2014 01:32:27 +0100 as excerpted:
> Duncan <1i5t5.dun...@cox.net> schrieb:
>
>> That also explains the report of a NOCOW VM-image still triggering the
>> snapshot-aware-defrag-related pathology. It was a _heavily_ auto-
>> snapshotted btrfs (thousands of snapshot
On Feb 6, 2014, at 6:01 PM, cwillu wrote:
> On Thu, Feb 6, 2014 at 6:32 PM, Kai Krakow wrote:
>> Duncan <1i5t5.dun...@cox.net> schrieb:
>>
Ah okay, that makes it clear. So, actually, in the snapshot the file is
still nocow - just for the exception that blocks being written to become
On Thu, Feb 6, 2014 at 6:32 PM, Kai Krakow wrote:
> Duncan <1i5t5.dun...@cox.net> schrieb:
>
>>> Ah okay, that makes it clear. So, actually, in the snapshot the file is
>>> still nocow - just for the exception that blocks being written to become
>>> unshared and relocated. This may introduce a lot
Duncan <1i5t5.dun...@cox.net> schrieb:
>> Ah okay, that makes it clear. So, actually, in the snapshot the file is
>> still nocow - just for the exception that blocks being written to become
>> unshared and relocated. This may introduce a lot of fragmentation but it
>> won't become worse when rewri
Kai Krakow posted on Wed, 05 Feb 2014 19:17:10 +0100 as excerpted:
> David Sterba schrieb:
>
>> On Tue, Feb 04, 2014 at 08:22:05PM -0500, Josef Bacik wrote:
>>> On 02/04/2014 03:52 PM, Kai Krakow wrote:
>>> >Hi!
>>> >
>>> >I'm curious... The whole snapshot thing on btrfs is based on its COW
>>>
David Sterba schrieb:
> On Tue, Feb 04, 2014 at 08:22:05PM -0500, Josef Bacik wrote:
>> On 02/04/2014 03:52 PM, Kai Krakow wrote:
>> >Hi!
>> >
>> >I'm curious... The whole snapshot thing on btrfs is based on its COW
>> >design. But you can make individual files and directory contents nocow
>> >by
On Tue, Feb 04, 2014 at 08:22:05PM -0500, Josef Bacik wrote:
> On 02/04/2014 03:52 PM, Kai Krakow wrote:
> >Hi!
> >
> >I'm curious... The whole snapshot thing on btrfs is based on its COW design.
> >But you can make individual files and directory contents nocow by applying
> >the C attribute on it
On 02/04/2014 03:52 PM, Kai Krakow wrote:
Hi!
I'm curious... The whole snapshot thing on btrfs is based on its COW design.
But you can make individual files and directory contents nocow by applying
the C attribute on it using chattr. This is usually recommended for database
files and VM images.
Hi!
I'm curious... The whole snapshot thing on btrfs is based on its COW design.
But you can make individual files and directory contents nocow by applying
the C attribute on it using chattr. This is usually recommended for database
files and VM images. So far, so good...
But what happens to s
15 matches
Mail list logo
