Como o nome do pacote mudou, você precisa remover o pacote antigo e instalar o novo. No entanto, em vez de fazer isso em duas etapas, é mais limpo usar o shell yum. Isso removerá o pacote antigo e instalará o novo em uma única transação:
yum shell
> install mongodb-org
> remove mongo-10gen
> remove mongo-10gen-server
> run
--> Running transaction check
---> Package mongo-10gen.i686 0:2.4.10-mongodb_1 will be erased
---> Package mongo-10gen-server.i686 0:2.4.10-mongodb_1 will be erased
---> Package mongodb-org.i686 0:2.6.0-1 will be installed
--> Processing Dependency: mongodb-org-tools = 2.6.0 for package: mongodb-org-2.6.0-1.i686
--> Processing Dependency: mongodb-org-shell = 2.6.0 for package: mongodb-org-2.6.0-1.i686
--> Processing Dependency: mongodb-org-server = 2.6.0 for package: mongodb-org-2.6.0-1.i686
--> Processing Dependency: mongodb-org-mongos = 2.6.0 for package: mongodb-org-2.6.0-1.i686
--> Running transaction check
---> Package mongodb-org-mongos.i686 0:2.6.0-1 will be installed
---> Package mongodb-org-server.i686 0:2.6.0-1 will be installed
---> Package mongodb-org-shell.i686 0:2.6.0-1 will be installed
---> Package mongodb-org-tools.i686 0:2.6.0-1 will be installed
--> Finished Dependency Resolution
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
mongodb-org i686 2.6.0-1 10gen 4.6 k
Removing:
mongo-10gen i686 2.4.10-mongodb_1 @10gen 181 M
mongo-10gen-server i686 2.4.10-mongodb_1 @10gen 30 M
Installing for dependencies:
mongodb-org-mongos i686 2.6.0-1 10gen 6.7 M
mongodb-org-server i686 2.6.0-1 10gen 8.9 M
mongodb-org-shell i686 2.6.0-1 10gen 4.2 M
mongodb-org-tools i686 2.6.0-1 10gen 88 M
Transaction Summary
================================================================================
Install 1 Package (+4 Dependent packages)
Remove 2 Packages
Total download size: 108 M
Is this ok [y/d/N]: y
Downloading packages:
(1/5): mongodb-org-2.6.0-1.i686.rpm | 4.6 kB 00:00
(2/5): mongodb-org-mongos-2.6.0-1.i686.rpm | 6.7 MB 00:00
(3/5): mongodb-org-server-2.6.0-1.i686.rpm | 8.9 MB 00:00
(4/5): mongodb-org-shell-2.6.0-1.i686.rpm | 4.2 MB 00:00
(5/5): mongodb-org-tools-2.6.0-1.i686.rpm | 88 MB 00:04
--------------------------------------------------------------------------------
Total 19 MB/s | 108 MB 00:05
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : mongodb-org-server-2.6.0-1.i686 1/7
Installing : mongodb-org-mongos-2.6.0-1.i686 2/7
Installing : mongodb-org-tools-2.6.0-1.i686 3/7
Installing : mongodb-org-shell-2.6.0-1.i686 4/7
Installing : mongodb-org-2.6.0-1.i686 5/7
Erasing : mongo-10gen-server-2.4.10-mongodb_1.i686 6/7
Erasing : mongo-10gen-2.4.10-mongodb_1.i686 7/7
Verifying : mongodb-org-2.6.0-1.i686 1/7
Verifying : mongodb-org-shell-2.6.0-1.i686 2/7
Verifying : mongodb-org-tools-2.6.0-1.i686 3/7
Verifying : mongodb-org-mongos-2.6.0-1.i686 4/7
Verifying : mongodb-org-server-2.6.0-1.i686 5/7
Verifying : mongo-10gen-server-2.4.10-mongodb_1.i686 6/7
Verifying : mongo-10gen-2.4.10-mongodb_1.i686 7/7
Removed:
mongo-10gen.i686 0:2.4.10-mongodb_1
mongo-10gen-server.i686 0:2.4.10-mongodb_1
Installed:
mongodb-org.i686 0:2.6.0-1
Dependency Installed:
mongodb-org-mongos.i686 0:2.6.0-1 mongodb-org-server.i686 0:2.6.0-1
mongodb-org-shell.i686 0:2.6.0-1 mongodb-org-tools.i686 0:2.6.0-1
Finished Transaction
> exit
Leaving Shell
