I get messages like this fairly frequently on our SL7 servers:

/etc/cron.daily/0yum-daily.cron:

Not using downloaded repomd.xml because it is older than what we have:
  Current   : Fri Mar 25 08:54:39 2016
  Downloaded: Fri Mar 25 08:54:20 2016

Today, this is from the sl-security repo:

-rw-r--r--. 1 root root 3059 Mar 25 08:54
/var/cache/yum/x86_64/7/sl-security/repomd.xml

We use a mirroring scheme that is based on time-stamps which may be
aggravating this locally, and are mirroring from
http://ftp1.scientificlinux.org/linux/scientific

However it seems that the time-stamps of these files should never go
backwards.  Is there something going on in the SL staging process causing this?


-- 
Orion Poplawski
Technical Manager                     303-415-9701 x222
NWRA, Boulder/CoRA Office             FAX: 303-415-9702
3380 Mitchell Lane                       [log in to unmask]
Boulder, CO 80301                   http://www.nwra.com