[OpenAFS] Read-only volume issues

[Jeffrey Altman]

This is a cryptographically signed message in MIME format.

--------------ms060104020203060809010600
Content-Type: multipart/mixed;
 boundary="------------84D484BCB79153E15154773C"

This is a multi-part message in MIME format.
--------------84D484BCB79153E15154773C
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable

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


--------------84D484BCB79153E15154773C
Content-Type: text/x-vcard; charset=utf-8;
 name="jaltman.vcf"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: attachment;
 filename="jaltman.vcf"

begin:vcard
fn:Jeffrey Altman
n:Altman;Jeffrey
org:AuriStor, Inc.
adr:Suite 6B;;255 West 94Th Street;New York;New York;10025-6985;United St=
ates
email;internet:jaltman@auristor.com
title:Founder and CEO
tel;work:+1-212-769-9018
note;quoted-printable:LinkedIn: https://www.linkedin.com/in/jeffreyaltman=
=3D0D=3D0A=3D
	Skype: jeffrey.e.altman=3D0D=3D0A=3D
=09
url:https://www.auristor.com/
version:2.1
end:vcard


--------------84D484BCB79153E15154773C--

--------------ms060104020203060809010600
Content-Type: application/pkcs7-signature; name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"
Content-Description: S/MIME Cryptographic Signature
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--------------ms060104020203060809010600--