[OpenAFS] accessing /afs processes go into device wait

[Jeffrey Altman]

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On 11/8/2018 12:22 PM, John Sopko wrote:>
> I am running afsd with:
>
> /usr/vice/etc/afsd -dynroot -fakestat-all -afsdb

-dynroot

do not mount a root.afs volume. instead populate the /afs directory
with the results of cell lookups

-afsdb

if the requested name does not match a cell found in the CellServDB
file, query DNS first for SRV records and if no match, then AFSDB
records

Note that default RHEL6 configuration for the DNS resolver does not
cache negative DNS results.

An attempt to open /afs/.htaccess therefore results in DNS queries for
"htaccess" plus whatever domains are in the search list. If the search
list is cs.unc.edu and unc.edu then for each access there will be the
following DNS queries

SRV _afs3-vlserver._udp.htaccess.cs.unc.edu
SRV _afs3-vlserver._udp.unc.edu
AFSDB htaccess.cs.unc.edu
AFSDB htaccess.unc.edu

You can add a dummy htaccess.cs.unc.edu entry to CellServDB. You can
add a blacklist for that name. You can stop using -afsdb or you can
stop using -dynroot and rely upon a locally managed root.afs volume.

Jeffrey Altman





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fn:Jeffrey Altman
n:Altman;Jeffrey
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adr:Suite 6B;;255 West 94Th Street;New York;New York;10025-6985;United St=
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email;internet:jaltman@auristor.com
title:Founder and CEO
tel;work:+1-212-769-9018
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