samba - Dec 2016 - How to avoid CIFS timeout?

Dear all,

My storage could be very slow for open/read/write sometimes (not always). To
avoid CIFS timeout (Linux), I configure samba server "async smb echo
handler = yes".

On server side, I can see two smbd processes are generated for every CIFS
client, and one of them is for echo server.

On client side, I confirm CIFS 1.0 is used (and "hard" option is also
used).

But I can still observed the following logs on client side:

CIFS VFS: Server 10.57.33.134 has not responded in 120 seconds. Reconnecting...


My samba server version 4.2.10.

Can anyone suggest me how to avoid CIFS client timeout? (echo_interval is not
good as most of existing Linux distributions today do not support it)


Thanks
Mike

Hello Zhiye,

 On my opinion, you can improve the CIFS performance instead of avoiding CIFS 
timeout. Such as extend read/write size and change the cache type. I don't
think
enable "async smb echo handler" is a good choice for your situation.
This option
will depress performance.


----- Original Message -----
> From: "Zhiye via samba Wang" <samba at lists.samba.org>
> To: samba at lists.samba.org
> Sent: Wednesday, December 21, 2016 5:55:11 PM
> Subject: [Samba] How to avoid CIFS timeout?
> 
> Dear all,
> 
> My storage could be very slow for open/read/write sometimes (not always).
To
> avoid CIFS timeout (Linux), I configure samba server "async smb echo
handler
> = yes".
> 
> On server side, I can see two smbd processes are generated for every CIFS
> client, and one of them is for echo server.
> 
> On client side, I confirm CIFS 1.0 is used (and "hard" option is
also used).
> 
> But I can still observed the following logs on client side:
> 
> CIFS VFS: Server 10.57.33.134 has not responded in 120 seconds.
> Reconnecting...
> 
> 
> My samba server version 4.2.10.
> 
> Can anyone suggest me how to avoid CIFS client timeout? (echo_interval is
not
> good as most of existing Linux distributions today do not support it)
> 
> 
> Thanks
> Mike
> 
> 
> 
> --
> To unsubscribe from this list go to the following URL and read the
> instructions:  https://lists.samba.org/mailman/options/samba

This is not about CIFS performance. It's actually the underlying storage
cannot response in time sometimes. Improving underlying storage performance is
out of my control.

On the other hand, I wonder if this option "async smb echo handler"
really work at all. It seems the echo handler process has no network connection
with client, instead of, it gets request from a pipe linked to the FS service
process. So, if FS service process gets hang on open/read/write/close, the echo
handler process has no chance to serve echo request from client. Is that true?

Another point, it seems smbd is a single thread application (as of 4.x). Is
there a multithread version?


Thanks
Mike


________________________________
发件人: Xiaoli Feng <xifeng at redhat.com>
发送时间: 2016年12月23日 14:02
收件人: Wang, Zhiye
抄送: samba at lists.samba.org
主题: Re: [Samba] How to avoid CIFS timeout?

Hello Zhiye,

 On my opinion, you can improve the CIFS performance instead of avoiding CIFS
timeout. Such as extend read/write size and change the cache type. I don't
think
enable "async smb echo handler" is a good choice for your situation.
This option
will depress performance.


----- Original Message -----
> From: "Zhiye via samba Wang" <samba at lists.samba.org>
> To: samba at lists.samba.org
> Sent: Wednesday, December 21, 2016 5:55:11 PM
> Subject: [Samba] How to avoid CIFS timeout?
>
> Dear all,
>
> My storage could be very slow for open/read/write sometimes (not always).
To
> avoid CIFS timeout (Linux), I configure samba server "async smb echo
handler
> = yes".
>
> On server side, I can see two smbd processes are generated for every CIFS
> client, and one of them is for echo server.
>
> On client side, I confirm CIFS 1.0 is used (and "hard" option is
also used).
>
> But I can still observed the following logs on client side:
>
> CIFS VFS: Server 10.57.33.134 has not responded in 120 seconds.
> Reconnecting...
>
>
> My samba server version 4.2.10.
>
> Can anyone suggest me how to avoid CIFS client timeout? (echo_interval is
not
> good as most of existing Linux distributions today do not support it)
>
>
> Thanks
> Mike
>
>
>
> --
> To unsubscribe from this list go to the following URL and read the
> instructions:  https://lists.samba.org/mailman/options/samba
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