Confusion Regarding Physical Volume,Volume Group,Logical Volume,Physical partition Post: 302667673

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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

07-06-2012

Registered User

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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LEARN ABOUT DEBIAN

mbget

lastfm(1)						      General Commands Manual							 lastfm(1)

NAME

       mbfind, mbget, mbsubmit - interface to the MusicBrainz database

SYNOPSIS

       mbget [--device DEV] [--discid ID] [--albumid ID] [--freedb]
       mbfind [--artist ARTIST] [--album ALBUM] [--verbose]
       mbsubmit

DESCRIPTION

       mbget  prints  a listing of the specified album (by default, the disc in /dev/cdrom), in either a serialized format compatible with lastfm-
       submitd(1) or a format compatible with FreeDB.  mbfind lists albums in the MusicBrainz database	matching  the  given  criteria.   mbsubmit
       opens a web browser window to submit the disc ID of the disc in /dev/cdrom to MusicBrainz.

OPTIONS

       -a, --artist
	      Specify the artist name to search for.

       -b, --album
	      Specify the album name to search for.

       -v, --verbose
	      Print all RDF responses read from the server (for debugging purposes).

       -d, --device
	      Specify the device to read a disc ID from.

       -i, --discid
	      Specify a disc ID; do not read from any devices.

       -a, --albumid
	      Specify an album ID; do not read from any devices.

       -f, --freedb
	      Print output in FreeDB format.

AUTHOR

       Decklin Foster <decklin@red-bean.com>.

																	 lastfm(1)

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