[OpenAFS] Read-only volume issues

Jeffrey Altman jaltman@auristor.com
Tue, 21 Jun 2016 11:33:27 -0400


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On 6/21/2016 2:36 AM, Jan Iven wrote:
>
> One way could be to serve all "readonly" content (i.e. those with rw+ro=

> volumes) from dedicated Samba servers that run with
>=20
>  read only =3D yes
>  locking =3D no
> and possibly
>  oplocks =3D False
> (per
> https://www.samba.org/samba/docs/man/Samba-HOWTO-Collection/locking.htm=
l)
>=20
> you could also increase logging (-d, or "kill -SIGTSTP") on a test AFS
> server to see what operation exactly is being attempted (and fails), se=
e
> "man dafileserver"). Works best if you isolate the volume in question t=
o
> a dedicated server.

On the AFS file servers I would recommend using audit logs instead of
debug logging because they record every RPC and can be filtered by host
IP address and Volume ID.   Each OpCode is recorded plus the return code.=


On the Samba server recording "fs trace" output would show what the AFS
cache manager thinks the Samba server is requesting.

Samba logs will show what Samba is receiving from its clients.  All of
those sources will need to be correlated to identify the actual flow of
requests and failures.

Jeffrey Altman


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