Preface
I never like today for Linux systems have a feeling half-step into the door.
Read Chapter progress has reached 17.5 for Linux is gradually thorough understanding of, and now I really feel, I've read the book in the end are reading something, a bit too shall tricks of the bar.
In reading this book, I feel really benefited, at all levels, a 700-page book, if it is the fourth edition of e-books, there are 1050 because of technological advances, the Primer despite facing the novice, but really based on Centos Distribution, so part of what I really feel somewhat helpless, because I find the mirror online time, centos is not mirrored version of amd64.
I feel this book is the most important passage is talking about Linux / Unix history when talking about a paragraph, or a concept. The concept is Ken Thompson Unics file system proposed, personal feeling, the whole book in the evolving around this concept:
- All devices are program or system files
- Whether to build a compiler or a subordinate files, programs written only one purpose is to effectively accomplish goals
So, in fact, a book or author would like to express the key is often reflected in the relative minutiae from some parts of it, the author is very bad.
Content
15.4 RECAP
- Quota systems can equitable distribution of the above disk space to users; resource allocation may be disk capacity (block) or number (inode) file can be built
- Quota restrictions may have soft, hard, gracetime other important options
- Quota restrictions only for the entire file system is not directed against directory
- Quota is necessary to use the kernel and file system support. Parameter file system must contain usrquota, grpquota
- Quota practice commands are quotacheck, quotaon, edquota, repquota etc.
- Disk array (RAID) has points of hardware and software, Linux operating system support software disk arrays is achieved by mdadm package
- Consider the disk array constructed according to the "capacity", "performance", "data reliability" and
- Build a disk array have a common level of RAID-0, RAID-1, RAID-0 + 1, RAID-5 and RAID-6
- SCSI device file name with the same hardware disk array, as software RAID, compared with / dev / md [0-9]
- State disk array software through / proc / mdstat file to understand
- LVM emphasized that the elastic capacity of the file system changes
- LVM-related component has PV / VG / PE / LV and the like, may be formatted as LV
- LVM snapshot feature has, LV snapshot of the data content can be recorded and shared with the original LV does not cover modifications of data, backup and restore becomes simple
- Ext3 file system can be flexibly adjusted by the size of the command resize2fs
Daily Task
Recently working with Poker3 replaced Poker2, the keys feel really more comfortable setting, black shaft axis becomes red, well, I admit that he is quite slow in this regard, see the official did not know the instructions.
Eventually, you'll get old, and I will be crowned king!
I do rest of his life to make the world more interesting it, everyone can follow their inner interests and hobbies. While working, make your life so much more beautiful than ever before, while also creating some value for the community, this is not good?
Less plot calculations, more interesting souls, and that is the life I want.
Generally turned a bit later chapters, I feel this book up to three days, I can get = =, not easy, nearly 800-page book, this is the first time such an orderly manner reading is complete.