[CentOS] Broken repo / mirrors?

> If the affected packages are manually fetched with wget using 
> the same URL that yum reported as broken, all the signatures 
> check OK and "yum localinstall" upgrades the packages without 
> complaint.

wget
http://mirror.nexcess.net/CentOS/5.5/updates/i386/RPMS/device-mapper-1.0
2.39-1.el5_5.2.i386.rpm
yum localinstall ./device-mapper-1.02.39-1.el5_5.2.i386.rpm

This pulls down needed dependencies and the The Magic Happens.

Thanks, Bob!
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