O Yum está solicitando hashes updateinfo.xml inexistentes no diretório repodata

Question

Alguma ideia do motivo pelo qual preciso "yum clean dbcache metadata" com frequência? Eu estou usando centos6.6 e tem o repo epel. Freqüentemente falha em obter os pacotes dos espelhos com um erro 404 até eu limpar o yum novamente. Abaixo está uma parte do log.

Trying other mirror.
http://mirrors.syringanetworks.net/fedora-epel/6/x86_64/repodata/3a5d63c8e27b2a5b5bf046c71ec05e3710df642c3e13f6e6354bd2b613f3c7e7-updateinfo.xml.gz: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
http://mirror.sfo12.us.leaseweb.net/epel/6/x86_64/repodata/3a5d63c8e27b2a5b5bf046c71ec05e3710df642c3e13f6e6354bd2b613f3c7e7-updateinfo.xml.gz: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
http://mirrors.cat.pdx.edu/epel/6/x86_64/repodata/3a5d63c8e27b2a5b5bf046c71ec05e3710df642c3e13f6e6354bd2b613f3c7e7-updateinfo.xml.gz: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
http://mirrors.tummy.com/pub/fedora.redhat.com/epel/6/x86_64/repodata/3a5d63c8e27b2a5b5bf046c71ec05e3710df642c3e13f6e6354bd2b613f3c7e7-updateinfo.xml.gz: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
http://mirrors.kernel.org/fedora-epel/6/x86_64/repodata/3a5d63c8e27b2a5b5bf046c71ec05e3710df642c3e13f6e6354bd2b613f3c7e7-updateinfo.xml.gz: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.

Esta é a saída do repositório

# yum repolist
Loaded plugins: fastestmirror, presto, security
Loading mirror speeds from cached hostfile
 * base: mirror.solarvps.com
 * epel: mirror.symnds.com
 * extras: mirror.metrocast.net
 * updates: mirror.es.its.nyu.edu
repo id                                                     repo name                                                                                           status
base                                                        CentOS-6 - Base                                                                                      6,518
epel                                                        Extra Packages for Enterprise Linux 6 - x86_64                                                      11,745
extras                                                      CentOS-6 - Extras                                                                                       38
updates                                                     CentOS-6 - Updates                                                                                   1,370
repolist: 19,671

ATUALIZAÇÕES: Eu uso o livro de receitas do chef para instalar. link .. Não vejo nenhum meio especial usado para instalar o repositório.

/var/log/yum.log (mostra o plugin que eu instalei hoje, depois de limpar o yum)

Jul 07 20:42:05 Installed: wget-1.12-5.el6_6.1.x86_64
Jul 23 17:17:12 Updated: nginx-filesystem-1.0.15-12.el6.noarch
Jul 23 17:17:12 Updated: nginx-1.0.15-12.el6.x86_64
Jul 30 21:25:43 Installed: yum-plugin-security-1.1.30-30.el6.noarch

/etc/yum.conf

# This file was generated by Chef
# Do NOT modify this file by hand.

[main]
cachedir=/var/cache/yum/$basearch/$releasever
debuglevel=2
distroverpkg=centos-release
exactarch=1
gpgcheck=1
installonly_limit=3
keepcache=0
logfile=/var/log/yum.log
obsoletes=1
plugins=1

/etc/yum.repos.d/epel.repo

# This file was generated by Chef
# Do NOT modify this file by hand.

[epel]
name=Extra Packages for Enterprise Linux 6 - $basearch
enabled=1
failovermethod=priority
gpgcheck=1
gpgkey=https://dl.fedoraproject.org/pub/epel/RPM-GPG-KEY-EPEL-6
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearch
sslverify=true