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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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ql-dynamic-tgt-disc(8)					       System Administration					    ql-dynamic-tgt-disc(8)

NAME
ql-dynamic-tgt-lun-disc - Scans for newly added LUNs. SYNOPSIS
ql-dynamic-tgt-lun-disc [OPTIONS] DESCRIPTION
Dynamic TGT-LUN Discovery Utility This utility scans for newly added LUNs. After adding new LUNs, you do not need to unload, then load the QLogic FC driver or reboot the system To begin scanning the LUNs issue following command: # /usr/sbin/ql-dynamic-tgt-lun-disc -al, --allow-lip LIP is not issued by default, even if it is required for scanning new LUNs Setting this option, allows the utility to issue LIP. -cl, --current-luns Displays LUNS currently present -e, --extended-scan Use this option as "-e | --extended-scan". to rescan LUNs. This will identify any change in attributes of existing LUNs. This option can be used in combination of scan/refresh or max luns -h, --help, ? Prints this help message -i, --interactive Use this option to use the menu driven program -is, --iscsi Use this option to operate on ISCSI HBAs, this option can be used in combination of any other supported option. -m, --max-lun To set the maximum LUNs to be scanned -p, --proc Use PROC file system for LUN scanning -r, --refresh To refresh, that is remove LUNs that are lost use the options "-r|--refresh". This will remove the LUNs which no more exist. -s, --scan [ -r|--refresh ] The QLogic LUN scan utility re-scans all the devices connected to the QLogic HBA SEE ALSO
ql-lun-state-online(8), ql-hba-snapshot(8), ql-set-cmd-timeout(8) Matthias Schmitz <;matthias@sigxcpu.org> July 2009 ql-dynamic-tgt-disc(8)
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