Rozdział 19. The Vinum Volume Manager

Originally written by Greg Lehey.
Spis treści
19.1. Synopsis
19.2. Disks Are Too Small
19.3. Access Bottlenecks
19.4. Data Integrity
19.5. Vinum Objects
19.6. Some Examples
19.7. Object Naming
19.8. Configuring Vinum
19.9. Using Vinum for the Root Filesystem

19.1. Synopsis

No matter what disks you have, there are always potential problems:

  • They can be too small.

  • They can be too slow.

  • They can be too unreliable.

One way some users safeguard themselves against such issues is through the use of multiple, and sometimes redundant, disks.

In addition to supporting various cards and controllers for hardware RAID systems, the base FreeBSD system includes the Vinum Volume Manager, a block device driver that implements virtual disk drives.

Vinum provides more flexibility, performance, and reliability than traditional disk storage, and implements RAID-0, RAID-1, and RAID-5 models both individually and in combination.

This chapter provides an overview of potential problems with traditional disk storage, and an introduction to the Vinum Volume Manager.

Uwaga:

Starting with FreeBSD 5, Vinum has been rewritten in order to fit into the GEOM architecture (Rozdział 18, GEOM: Modular Disk Transformation Framework), retaining the original ideas, terminology, and on-disk metadata. This rewrite is called gvinum (for GEOM vinum). The following text usually refers to Vinum as an abstract name, regardless of the implementation variant. Any command invocations should now be done using the gvinum command, and the name of the kernel module has been changed from vinum.ko to geom_vinum.ko, and all device nodes reside under /dev/gvinum instead of /dev/vinum. As of FreeBSD 6, the old Vinum implementation is no longer available in the code base.

All FreeBSD documents are available for download at http://ftp.FreeBSD.org/pub/FreeBSD/doc/

Questions that are not answered by the documentation may be sent to <freebsd-questions@FreeBSD.org>.
Send questions about this document to <freebsd-doc@FreeBSD.org>.