Server Admin Chapter 6

Type 1 hypervisor

Interacts with the software directly. Contains a small OS to manage the hypervisor (Proxmox)

Type 2 hypervisor

Designed to run on an existing machine's OS

Kernel Virtual Machine

Built-in Linux hypervisor functionality

Thick vs. Thin Provisioning

Thick has a fixed file size, while thin has a dynamically allocated file size

Boxes

Used to configure and manage VMs

RAID Level 0

Disk striping. Stripes data across the drives to improve disk read/write efficiency. Does not provide redundancy.

RAID Level 1

Disk mirroring or disk duplexing. Any data written to disk one is also written to disk two. Provides redundancy.

RAID Level 5

Striping with parity, at least 3 disks. If one fails, the parity disk will reconstruct the data. 66% of the drive is open, the rest is used by parity

SCSI configuration

Transfer protocol used between a server and a SAN device

iSCSI Initiator

A software component within the OS that connects to the SAN device

iSCSI Target

Storage that is made available to iSCSI initiator

Fibre channel configuration

Used to transport SCSI data

ZFS configuration

Zettabyte file system.

A high performance filesystem designed for large-scale Linux systems

zpool command

Creates a group of physical disks that ZFS can manage

BTRFS configuration

Provides many features similar to ZFS, but not as fast as ZFS. Eventually will replace ext4.

BTRFS structure

Data (available blocks), metadata (inodes), and system (superblock)

mkfs.btrfs command

Creates a btrfs filesystem

btrfs command

Manages the btrfs filesystem

Things to know when installing Linux server

Host name and IP of the server, auto updating?, package selection, root password