[Samba] Sharing a caching NFS mount with samba?

[Andrew Wilkinson]

On Wed, Mar 9, 2011 at 4:30 PM, Andrew Wilkinson <drukargin at gmail.com>wrote:

> On Wed, Mar 9, 2011 at 3:19 PM, Andrew Wilkinson <drukargin at gmail.com>wrote:
>
>> On Wed, Mar 9, 2011 at 9:46 AM, Volker Lendecke <
>> Volker.Lendecke at sernet.de> wrote:
>>
>>> On Wed, Mar 09, 2011 at 09:42:47AM -0800, Andrew Wilkinson wrote:
>>> > Is there any more information I can give that might help anyone better
>>> > understand the scenario?
>>>
>>> Samba does normal posix calls. Can you point out in strace
>>> which of the calls breaks the caching?
>>>
>>> Volker
>>>
>>> --
>>> SerNet GmbH, Bahnhofsallee 1b, 37081 Göttingen
>>> phone: +49-551-370000-0, fax: +49-551-370000-9
>>> AG Göttingen, HRB 2816, GF: Dr. Johannes Loxen
>>>
>>
>> I'm sorry to say I'm not very familiar with what I should be looking for
>> in the strace outputs.  However, on comparing the outputs of the samba
>> process and a cp process that successfully hit the cache, the only real
>> differences I'm noting are that cp is using read() and samba is using
>> pread().  Samba also does some mojo with fcntl, I believe setting locks on
>> ranges of the file.
>>
>> If you'd like, I can give you those strace logs.
>>
>> Thanks!
>>
>> -Andy
>>
>
> As a point of interest, the option "read raw = no" appears to allow the use
> of the cache.  The hits seem to expire more quickly than they should,
> though, it seems like.  If I don't touch a file for more than a minute or
> so, it copies the whole thing again.
>
> Thanks,
>
> -Andy
>

Putting this back on the list because I accidentally derailed it.  Thanks
for calling that to my attention, Volker!

-Andy