Anyone has experience with mirroring vg for Oracle Database and Application Post: 302785435

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Operating Systems AIX Anyone has experience with mirroring vg for Oracle Database and Application Post 302785435 by DGPickett on Monday 25th of March 2013 03:49:40 PM

03-25-2013

Registered User

If you can segregate high churn and query from low churn and query (work in progress versus quiescent history), RAID alone is fine for history, but mirror is better for both high churn and high query.

For instance, RAID with 5 drives 1-5 is striped so drive 5 block zero is parity for superblock 0, and drive 5 block 1 starts superblock1. Every write writes all 5 drives and every read can only be had from one device, but sequential reading is striped 5 ways. Writing is striped 4 ways since parity takes the 5th drive.

In practice, SAN mirrors are often raid at a lower level, so there can be a hidden cost, since you cannot reclaim the raid %.

DGPickett

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fribidi_set_mirroring

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)