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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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fribidi_set_mirroring(3)					Programmer's Manual					  fribidi_set_mirroring(3)

NAME
fribidi_set_mirroring - set mirroring on or off SYNOPSIS
#include <fribidi.h> fribidi_boolean fribidi_set_mirroring(fribidi_boolean state); PARAMETERS
fribidi_boolean state New state to set. DESCRIPTION
This function is used to turn character mirroring on or off. Character mirroring is the act of replacing a mirrorable glyph (character), eg. Left paranthesis, with the matching glyph, eg. Right paranthesis, in a right-to-left resolved context. If your rendering engine does mirroring itself, you may want to turn it off here. This flag is on by default. This function is deprecated and only used with other deprecated functions. RETURNS
The new mirroring status. SEE ALSO
fribidi_charset_to_unicode(3), fribidi_unicode_to_charset(3), fribidi_parse_charset(3), fribidi_shape_arabic(3), fribidi_get_par_direc- tion(3), fribidi_get_par_embedding_levels(3), fribidi_reorder_line(3), fribidi_get_bidi_type(3), fribidi_get_bidi_types(3), fribidi_get_bidi_type_name(3), fribidi_debug_status(3), fribidi_mirroring_status(3), fribidi_reorder_nsm_status(3), fribidi_set_reorder_nsm(3), fribidi_log2vis_get_embedding_levels(3), fribidi_get_type(3), fribidi_get_type_internal(3), fribidi_remove_bidi_marks(3), fribidi_log2vis(3), fribidi_join_arabic(3), fribidi_get_joining_type(3), fribidi_get_joining_types(3), fribidi_get_joining_type_name(3), fribidi_get_mirror_char(3), fribidi_shape_mirroring(3), fribidi_shape(3) GNU FriBidi 0.19.3 25 August 2012 fribidi_set_mirroring(3)
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