* btrfs big metadata
@ 2012-07-02 6:56 Stefan Priebe - Profihost AG
2012-07-02 16:42 ` Gregory Farnum
0 siblings, 1 reply; 3+ messages in thread
From: Stefan Priebe - Profihost AG @ 2012-07-02 6:56 UTC (permalink / raw)
To: ceph-devel@vger.kernel.org
Hello list,
i found several people who use big metadata -n 64k -l 64k for ceph. But
i haven't found any ceph doc or info why to use this?
What's the reason to use big metadata feature with ceph?
Greets,
Stefan
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: btrfs big metadata
2012-07-02 6:56 btrfs big metadata Stefan Priebe - Profihost AG
@ 2012-07-02 16:42 ` Gregory Farnum
2012-07-02 17:40 ` Stefan Priebe
0 siblings, 1 reply; 3+ messages in thread
From: Gregory Farnum @ 2012-07-02 16:42 UTC (permalink / raw)
To: Stefan Priebe - Profihost AG; +Cc: ceph-devel@vger.kernel.org
On Sun, Jul 1, 2012 at 11:56 PM, Stefan Priebe - Profihost AG
<s.priebe@profihost.ag> wrote:
> Hello list,
>
> i found several people who use big metadata -n 64k -l 64k for ceph. But i
> haven't found any ceph doc or info why to use this?
>
> What's the reason to use big metadata feature with ceph?
One of the big problems users have had with Ceph-on-btrfs is that
Ceph's usage patterns cause btrfs to dramatically fragment its
metadata. Big metadata blocks reduce this fragmentation to a level
where some users find it faster than xfs (which it previously wasn't).
-Greg
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: btrfs big metadata
2012-07-02 16:42 ` Gregory Farnum
@ 2012-07-02 17:40 ` Stefan Priebe
0 siblings, 0 replies; 3+ messages in thread
From: Stefan Priebe @ 2012-07-02 17:40 UTC (permalink / raw)
To: Gregory Farnum; +Cc: ceph-devel@vger.kernel.org
Am 02.07.2012 18:42, schrieb Gregory Farnum:
> On Sun, Jul 1, 2012 at 11:56 PM, Stefan Priebe - Profihost AG
> <s.priebe@profihost.ag> wrote:
>> Hello list,
>>
>> i found several people who use big metadata -n 64k -l 64k for ceph. But i
>> haven't found any ceph doc or info why to use this?
>>
>> What's the reason to use big metadata feature with ceph?
>
> One of the big problems users have had with Ceph-on-btrfs is that
> Ceph's usage patterns cause btrfs to dramatically fragment its
> metadata. Big metadata blocks reduce this fragmentation to a level
> where some users find it faster than xfs (which it previously wasn't).
Thanks!
Stefan
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2012-07-02 17:40 UTC | newest]
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2012-07-02 6:56 btrfs big metadata Stefan Priebe - Profihost AG
2012-07-02 16:42 ` Gregory Farnum
2012-07-02 17:40 ` Stefan Priebe
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