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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LEARN ABOUT DEBIAN
array-info
array-info(1) array-info(1)
NAME
array-info - check the status of a HP (Compaq) SmartArray controller
SYNOPSIS
array-info -d array_device_path [-a|-l|-A|-c|-s|-L|-h]
DESCRIPTION
Array-info is a command line tool to retrieve informations and logical drives status from several RAID controllers (currently HP Compaq IDA
and CISS and MD). It displays informations about the firmware version, Rom revision, number of physical and logical drives on the con-
troller, aswell as the fault tolerance, size, number of physical disks and status for each logical drive.
OPTIONS
--device | -d
Path to array device, e.g. /dev/ida/c0d0 or /dev/cciss/c0d1
--all-drives | -a
Show informations about all drives
--logical drive | -l
Show informations about selected logical drive
--show-ctrl | -c
Show informations about controller
--show-logical | -L
Show informations about logical drives
--show-physical | -p
Show physical device informations
--show-status | -s
Show status of logical drives
--show-all | -A
Show all informations
--version | -V
Show version
-h Show help about options
COPYRIGHT
This manual page was written by Raphael Pinson <<raphink@ubuntu.com>>. Permission is granted to copy, distribute and/or modify this docu-
ment under the terms of the GNU General Public License, Version 2 or any later version published by the Free Software Foundation.
2006-12-15 array-info(1)