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--- guide:cloud:glossary [2020/09/04 12:48]
lphukungoane [Glossary of Terms]
+++ guide:cloud:glossary [2021/12/09 16:42] (current)
@@ Line 11: / Line 11: @@
 ======Glossary of Terms======
+----
-**Availability zone** - An Amazon EC2 concept of an isolated area that is used for fault tolerance. Do not confuse with an OpenStack Compute zone or cell.
+**Availability zone** - An Amazon EC2 concept of an isolated area that is used for fault tolerance. Do not confuse with an OpenStack Compute zone or cell. Availability Zones are an end-user visible logical abstraction for partitioning a cloud without knowing the physical infrastructure.
 **CIDR** - representation (<IP>/<prefix length>) of the network’s IP subnet.
@@ Line 50: / Line 52: @@
 **Public Key Authentication** - Authentication method that uses keys rather than passwords Backups.
-**QCOW2** - One of the VM image disk formats supported by Image service.The QCOW image format is one of the disk image formats supported by the QEMU processor emulator. It is a representation of a fixed size block device in a file.
+**QCOW2 (QEMU copy-on-write version 2)** - One of the VM image disk formats supported by Image service.The QCOW image format is one of the disk image formats supported by the QEMU processor emulator. It is a representation of a fixed size block device in a file.
-**RAW** - One of the VM image disk formats supported by Image service; an unstructured disk image.
+**RAW** - One of the VM image disk formats supported by Image service; an unstructured disk image. The raw image format is the simplest one, and is natively supported by both KVM and Xen hypervisors. You can think of a raw image as being the bit-equivalent of a block device file, created as if somebody had copied, say, /dev/sda to a file using the dd command
 **Routers** -  A physical or virtual network device that passes network traffic between

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