Service Pack Roll: Users Guide: 
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The Service Pack Roll can also be added to running frontend. Here's the procedure for an x86_64 cluster (for an i386 cluster, substitute x86_64 with i386).
# cd /tmp # wget ftp://ftp.rocksclusters.org/pub/rocks/rocks-5.0/service-pack-5.0.3-1.x86_64.disk1.iso # rocks add roll service-pack*iso # rocks enable roll service-pack # cd /home/install # rocks-dist dist # kroll service-pack > /tmp/service-pack-install.sh # sh /tmp/service-pack-install.sh |
Then, reboot your frontend:
# init 6 |
When the frontend reboots, the Service Pack Roll is now installed. There is no need to reinstall your compute nodes.