February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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Why LVM?
LVM is the Logical Volume Manager. Like DRBD, LVM is another abstraction layer that sits between the filesystem and the underlying disk devices. Why is this necessary? Well, LVM allows us to dynamically manage disk devices as one single continuous piece of storage that we can arbitrarily extend, group, freeze, or reorganize—all while remaining online.
Have you ever wanted to simply add storage to a filesystem without messy symbolic links or a server reboot? What about moving data from one device to another after an upgrade? With LVM, all of this is easily accomplished. Using a modern server with hot-swappable disks or a storage area network (SAN), we never even have to reboot the server to completely reconfigure its disk devices. ...
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