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Operating Systems AIX Filesystem using Oracle and mirroring VG ? Post 302710969 by funksen on Friday 5th of October 2012 07:20:04 AM
Old 10-05-2012
Bakunin is right, this depends on many things
large sequential ios would suffer less from a mirrored disk than a lot of small random ios

you didn't even say what kind of storage it is, local scsi, iscsi, san attached
I'll give you a short answer, because I'm short in time today

if your system is important enough to mirror the volume groups for data safety and to prevent a downtime due to a storage outage, then go for it


I do it this way:
cluster: mirror rootvg, mirror datavgs (mostly over two locations)
non cluster system that boots from san: no mirror at all
non cluster system that boots from local hdisk: mirror rootvg

if I would be using iscsi disks, I would mirror some of the more critical non cluster systems as well, but that's because our ip network is not as stable as our san
Quote:
Originally Posted by filosophizer
. If it indicates high I/O then after mirroring it would be even higher ? right ?
no, you must take a look at increased latency, and decreased overall data throughput in bytes/second

Last edited by funksen; 10-05-2012 at 08:25 AM..
 

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JIGDO-MIRROR(1) 														   JIGDO-MIRROR(1)

NAME
jigdo-mirror - Maintain a mirror of images offered with jigdo SYNOPSIS
jigdo-mirror [ config-file ] DESCRIPTION
See jigdo-file(1) for an introduction to Jigsaw Download. jigdo-mirror is a script intended for people who want to offer direct HTTP or FTP downloads of files for which only the jigdo and template files are available. As the first step of using jigdo-mirror, you need to set up normal HTTP/FTP/rsync mirroring both of the `.jigdo'/`.template' files and of the parts that are needed for the reconstruction of the images. For example, in the case that you want to mirror Debian CD images with jigdo-mirror, you need a mirror of the `.jigdo'/`.template' files and a Debian mirror on the local machine. At regular intervals (preferably immediately after the normal mirroring has finished), schedule a run of jigdo-mirror. It will search through a given directory for any `.jigdo' files and attempt to create all images offered by each file. The script requires you to set a number of variables - please refer to the start of /usr/bin/jigdo-mirror for a description of each of them. Since /usr/bin/jigdo-mirror will be overwritten whenever you upgrade jigdo-mirror, it is highly recommended not to change the set- tings directly in this script. Instead, personal settings should be saved in a file called .jigdo-mirror in your home directory, or in a different file whose name is then passed to the script as its first (and only) command line argument. SEE ALSO
jigdo-file(1), jigdo-lite(1) CD images for Debian Linux can be downloaded with jigdo <URL:http://www.debian.org/CD/jigdo-cd/>. AUTHOR
Jigsaw Download <URL:http://atterer.net/jigdo/> was written by Richard Atterer <jigdo atterer.net>, to make downloading of CD ROM images for the Debian Linux distribution more convenient. 19 May 2006 JIGDO-MIRROR(1)
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