1- If you have a HP server, onboard disks are always named: /dev/cciss/c0d0, etc.
In RHEL6, for devices attached to Smart Array using the hpsa dirver, the device
names will be /dev/sd but with ciss driver, you will see the old style name
convention.
2- Emergency mode has been removed from list of boot modes
3- Dracut has been replaced mkinitrd.
4- lvconvert --merge : Reverting to a previous snapshot
5- Tickless kernel and power management porfile support.
6- NFSv4 is the default NFS.
7- EXT-4 is the default filesystem.
8- Automated I/O alignment. SCSI and ATA standards have been extended to provide alignment and I/O hints, allowing automated tuning and I/O alignment
9- The new System Security Services Daemon (SSSD) provides centralized access to identity and authentication resources, enables caching and offline support
10- In virtualized environments, sVirt (powered by SELinux) protects guests from one another
To see more, http://www.europe.redhat.com/products/rhel/server/details/
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