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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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APT-MIRROR(1)						User Contributed Perl Documentation					     APT-MIRROR(1)

NAME
apt-mirror - apt sources mirroring tool SYNOPSIS
apt-mirror [configfile] DESCRIPTION
A small and efficient tool that lets you mirror a part of or the whole Debian GNU/Linux distribution or any other apt sources. Main features: * It uses a config similar to apts sources.list * It's fully pool comply * It supports multithreaded downloading * It supports multiple architectures at the same time * It can automatically remove unneeded files * It works well on overloaded channel to internet * It never produces an inconsistent mirror including while mirroring * It works on all POSIX compliant systems with perl and wget COMMENTS
apt-mirror uses /etc/apt/mirror.list as a configuration file. By default it is tuned to official Debian or Ubuntu mirrors. Change it for your needs. After you setup the configuration file you may run as root: # su - apt-mirror -c apt-mirror Or uncomment line in /etc/cron.d/apt-mirror to enable daily mirror updates. FILES
/etc/apt/mirror.list Main configuration file /etc/cron.d/apt-mirror Cron configuration template /var/spool/apt-mirror/mirror Mirror places here /var/spool/apt-mirror/skel Place for temporarily downloaded indexes /var/spool/apt-mirror/var Log files placed here. URLs and MD5 summs also here. CONFIGURATION EXAMPLES
The mirror.list configuration supports many options, the file is well commented explinging each option. here are some sample mirror configuration lines showing the various supported ways : Normal: deb http://example.com/debian stable main contrib non-free Arch Specific: ( many other arch's are supported ) deb-powerpc http://example.com/debian stable main contrib non-free HTTP and FTP Auth or non-standard port: deb http://user:pass@example.com:8080/debian stable main contrib non-free Source Mirroring: deb-src http://example.com/debian stable main contrib non-free ORIGINAL AUTHOR
Dmitry N. Hramtsov <hdn@nsu.ru> CURRENT AUTHORS
Dmitry N. Hramtsov <hdn@nsu.ru> Brandon Holtsclaw <me@brandonholtsclaw.com> perl v5.14.2 2012-01-28 APT-MIRROR(1)
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