Re: CephFS and Samba hang on copy of large file

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On Mon, Aug 15, 2016 at 9:58 AM, Wido den Hollander <wido@xxxxxxxx> wrote:
>
>> Op 15 augustus 2016 om 15:43 schreef Ira Cooper <ira@xxxxxxxxxxx>:
>>
>>
>> On Mon, Aug 15, 2016 at 9:35 AM, Wido den Hollander <wido@xxxxxxxx> wrote:
>> >
>> >> Op 15 augustus 2016 om 15:27 schreef Ira Cooper <ira@xxxxxxxxxxx>:
>> >>
>> >>
>> >> Have you tried the ceph VFS module in Samba yet?
>> >>
>> >
>> > Yes. That works, but the performance is a lot lower. So for that we are testing/using the CephFS kernel client.
>> >
>> > I would also like to see the VFS module upstream in Samba, you still need to manually patch it in.
>>
>> It is in upstream Samba.
>>
>> https://git.samba.org/?p=samba.git;a=blob;f=source3/modules/vfs_ceph.c;h=59e9b9cf9b3e8e5313a20823994fcacf9e4b4168;hb=f1b42ec778e08875e076df7fdf67dd69bf9b2757
>>
>> It's been there a while now.
>>
>> I'm curious what you are patching in, and what the performance numbers are. :)
>
> No, sorry for that confusion. I meant DEB and/or RPM packages. You have to compile manually which not all companies like.
>
> With the kernel client we see about 200MB/sec and with VFS about 50MB/sec.

I'm willing to bet that at lest some of it is page cache & read ahead.

>
> However, I still wonder why samba went in status D. That should not happen.
>
> Wido
>



-- 
Milosz Tanski
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