• Posts
Linux Sys Admin
• Lab Setup
• Linux Virtual Filesystem
• Basic Storage Partition
  • Why Disk Partition ?
  • Storage Overview
  • Disk Types
  • Interacting With Disks
  • Disk Partition
  • Backup Partition
  • File As Disk
• Advanced Storage Partition
  • LVM
  • RAID
  • swap
  • Quotas
  • Encryption
• Operation of Running Systems
  • Boot Process
  • Grub
  • Kernel
  • Systemd

Encryption

Why Use Encryption? Encryption should be used wherever sensitive data is being stored and transmitted. Configuring and using block device level encryption provides one of the strongest protections against harm caused by loss or compromise of data contained in hard drives and other media. Modern Linux distributions offer the choice of encrypting all or some of your disk partitions during installation. It is also straightforward to create and format encrypted partitions at a later time, but you cannot encrypt an already existing partition in place without a data copying operation.

April 18, 2021 Read

Logical Volume Manager

About Logical Volume Manager One or more physical volumes (disk partitions) are grouped together into a volume group. Then, the volume group is subdivided into logical volumes, which mimic to the system nominal physical disk partitions and can be formatted to contain mountable filesystems. Logical volumes are created by putting all the devices into a large pool of disk space (the volume group), and then allocating space from the pool to create a logical volume.

April 18, 2021 Read

Quotas

Filesystem Quotas Linux can use and enforce quotas on filesystems. Disk quotas allow administrators to control the maximum space particular users (or groups) are allowed. Considerable flexibility is allowed and quotas can be assigned on a per filesystem basis. Protection is provided against a subset of users exhausting collective resources. Utilities quotacheck quotacheck generates and updates quota accounting files. quotaon quotaon enables quota accounting. quotaoff quotaoff disables quota accounting.

April 18, 2021 Read

RAID

About RAID Three essential features of RAID are: mirroring: writing the same data to more than one disk striping: splitting of data to more than one disk parity: extra data is stored to allow problem detection and repair, yielding fault tolerance. Thus, use of RAID can improve both performance and reliability. mdadm is used to create and manage RAID devices. Once created, the array name, /dev/mdX, can be used just like any other device, such as /dev/sdb1.

April 18, 2021 Read

swap

About Swap Linux employs a virtual memory system, in which the operating system can function as if it had more memory than it really does. This kind of memory overcommission functions in two ways: Many programs do not actually use all the memory they are given permission to use. Sometimes, this is because child processes inherit a copy of the parent’s memory regions utilizing a COW (Copy On Write) technique, in which the child only obtains a unique copy (on a page-by-page basis) when there is a change.

April 18, 2021 Read