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Top Forums UNIX for Dummies Questions & Answers Confusion Regarding Physical Volume,Volume Group,Logical Volume,Physical partition Post 302667673 by methyl on Friday 6th of July 2012 04:19:35 PM
Old 07-06-2012
There are two major concepts in LVM to grasp:

Striping.
Where you deliberately create a Logical Volume across partitions on multiple physical discs. This can give a dramatic performance improvement.

Mirroring.
Where you have one (or preferably more) mirror copies of your critical Logical Volumes on totally different physical disc drives.
Disc drives do fail. With careful design for resilience you can keep running with a failed disc drive and replace a hot-pull disc without interruption to service. Taking this concept further you can fit multiple hot spare disc drives and configure the LVM system to automatically replace the failed disc drive.

Given the option of performance against resilience I would choose resilience every time.

Don't forget to check your server for failed disc drives at least once a day.

Ps. Checking resilent Disc Arrays is equally important because a failure will not be visible to your unix system.

Last edited by methyl; 07-06-2012 at 05:30 PM.. Reason: typos, layout, Ps
 

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cdde(1) 																   cdde(1)

NAME
cdde - Compact Disc Detect & Execute SYNOPSIS
cdde [-c filename] [-rbvVh] DESCRIPTION
cdde is a program that detects when a cdrom drive on your system has had a disc inserted. When it finds a disc inserted in the drive it will attempt to determine the type of the disc, and execute a specified command. This means you can put in a dvd and your favorite dvd software will start, or put in a data cd and it will be automatically mounted for you. Right now cdde can detect the following types of discs: * audio cd * data cd * dvd * mixed audio/data cd * vcd * svcd * blank cdr/dvdr For now the dvd checking is just a bit of magic that checks to see if there's a "video_ts" directory on the disc. Same goes for the vcd checking: it just looks for a "vcd" directory on the disc. cdde reads its configuration from "~/.cdde.xml" unless otherwise specified on the command line. OPTIONS
-r, --run Run commands on disc already in drive when is started. -b, --batch Batch mode: check all drives once then exit. (implies -r) -c, --config <filename> Use the config file <filename>. (Default is ~/.cdde.xml) -v, --verbose Print out lots of information. -V, --version Print out version information. -h, --help Print Display this help and exit. FILES
~/.cdde.xml SEE ALSO
cdde.xml(5) AUTHORS
Eric Lathrop <eric@ericlathrop.com> Stanislav Maslovski <stanislav.maslovski@gmail.com> WEBSITE
For the latest release of cdde, see: http://cdde.sourceforge.net/ Eric Lathrop 0.3.1 cdde(1)
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