[OpenAFS] Strange AFS update behavior.

Thu, 05 Jan 2012 15:41:38 -0500

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Its a bug.

I'm fairly sure the problem is due to the Windows page cache contents
not being updated because IIS already has the data in memory and there
are no new file extents or file handles being opened.

Jeffrey Altman

On 1/5/2012 3:02 PM, Hugh Caldwell wrote:
> The cache not updating on my Windows 2008 R2 servers is still a
> persistent problem. =20
>=20
> I believe the problem may be related to IIS. Some background on what
> I've been experiencing this week.
>=20
> I have three servers running IIS 7.5 with the openafs 1.7.4 client. I
> have one website that is only served from one of these servers at a
> time. What I've seen in the last few days is the web developers will
> inform me that changes they have made to the website are not showing up=
=2E
> I checked the active server and the content is indeed not showing up bu=
t
> it is available on the two stand by servers. I flush the cache on the
> active server and everything is updated. The web developers then make
> more changes a few minutes later and now the changes will not show up o=
n
> any of the three servers. Since I had just checked the two stand by
> servers this started up the application pools in IIS for the website on=

> all three servers which is what leads me to believe this may be IIS
> related.
>=20
> Could anyone provide me with ideas on troubleshooting and isolating thi=
s
> problem?
>=20
> Hugh Caldwell
> Astor & Sanders
> EWeb Systems Administrator
> United States Geological Survey
> 703-648-6812 (Office)
> 703-598-3472 (Cellular)
> hcaldwell@usgs.gov
> Room 2C123B
>=20
> ----- Forwarded by Hugh Caldwell/GIO/CONT/USGS/DOI on 01/05/2012 02:50
> PM -----
> From: 	Hugh Caldwell/GIO/CONT/USGS/DOI
> To: 	openafs-info@openafs.org
> Date: 	12/29/2011 05:41 PM
> Subject: 	RE: [OpenAFS] Strange AFS update behavior.
>=20
>=20
> -----------------------------------------------------------------------=
-
>=20
>=20
> The problem resurfaced again on my servers running 1.7.4 today. These
> are IIS 7.5 servers and the file in question was an aspx file.
>=20
> Navigating to the the directory in powershell I see the file has the
> correct time stamp. Opening the file in notepad I see the old file.
>=20
> Performing fs flushv on the directory allows me to open the correct fil=
e
> in notepad but IIS continues to serve the old file as if it hasn't
> received notification of the file change.
>=20
>=20
> Hugh Caldwell
> Astor & Sanders
> EWeb Systems Administrator
> United States Geological Survey
> 703-648-6812 (Office)
> 703-598-3472 (Cellular)
> hcaldwell@usgs.gov
> Room 2C123B
>=20
>=20
>=20
> From: 	Hugh Caldwell <hcaldwell@usgs.gov>
> To: 	Anders Hannus <Anders.Hannus@ltu.se>
> Cc: 	Lars Schimmer <l.schimmer@cgv.tugraz.at>,
> "openafs-info@openafs.org" <openafs-info@openafs.org>,
> openafs-info-admin@openafs.org
> Date: 	12/29/2011 09:54 AM
> Subject: 	RE: [OpenAFS] Strange AFS update behavior.
> Sent by: 	openafs-info-admin@openafs.org
>=20
>=20
> -----------------------------------------------------------------------=
-
>=20
>=20
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> I've updated all three of my servers to 1.7.4 and have not heard back
> from my users about update issues. Thinks are very quiet around here th=
e
> last couple weeks so I wouldn't say definitively that the problem has
> been resolved as I became aware of the issues when users reported the
> inconsistencies.
>=20
> I also can't really test the issue since the updates not showing up
> happened inconsistently between the servers.
>=20
> Hugh Caldwell
> Astor & Sanders
> EWeb Systems Administrator
> United States Geological Survey
> 703-648-6812 (Office)
> 703-598-3472 (Cellular)
> hcaldwell@usgs.gov
> Room 2C123B
>=20
>=20
> From:	Anders Hannus <Anders.Hannus@ltu.se>
> To:	Lars Schimmer <l.schimmer@cgv.tugraz.at>, "openafs-info@openafs.org=
"
> <openafs-info@openafs.org>
> Date:	12/29/2011 02:23 AM
> Subject:	RE: [OpenAFS] Strange AFS update behavior.
> Sent by:	openafs-info-admin@openafs.org
>=20
>=20
>=20
> -----------------------------------------------------------------------=
-
>=20
>=20
>=20
> Did upgrading to 1.7.4 fix this issue?
>=20
> I have had reports on similar issues on our Windows 7 lab computers
> (with 1.7.1 and maybe 1.7.2). After upgrading to 1.7.3 I have not heard=

> of this but that might not mean that the issue is gone. I have never
> been able to replicate it myself though. This and the next week we will=

> upgrade to 1.7.4 and hope that it will perform even better.
>=20
> /Anders Hannus
> Lule=C3=A5 technical university
>=20
> -----Original Message-----
> From: openafs-info-admin@openafs.org
> [_mailto:openafs-info-admin@openafs.org_] On Behalf Of Lars Schimmer
> Sent: den 22 december 2011 17:08
> To: openafs-info@openafs.org
> Subject: Re: [OpenAFS] Strange AFS update behavior.
>=20
> On 16.12.2011 22:55, Hugh Caldwell wrote:
>> I have three Windows 2008 R2 servers running openafs 1.7.1 and one of
>> them seems to have trouble updating the cache. Navigating to the AFS
>> directories in powershell shows the modified date and file size on the=

>> files to be identical. However when I open the file in an editor on
>> the problem server it opens the old file. Flushing the volume resolves=

>> the issue. Any ideas on what might be causing this behavior?
>=20
> Try upgrading to 1.7.4.
>=20
>> Thanks,
>>
>> Hugh Caldwell
>> Astor & Sanders
>> EWeb Systems Administrator
>=20
>=20
> MfG,
> Lars Schimmer
> --
> -------------------------------------------------------------
> TU Graz, Institut f=C3=BCr ComputerGraphik & WissensVisualisierung
> Tel: +43 316 873-5405       E-Mail: l.schimmer@cgv.tugraz.at
> Fax: +43 316 873-5402       PGP-Key-ID: 0x4A9B1723
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>=20
>=20
>=20
>=20

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