Rebooting redundant VIOs and mirroring of PVs they serve to client LPARs Post: 302968033

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Operating Systems AIX Rebooting redundant VIOs and mirroring of PVs they serve to client LPARs Post 302968033 by maraixadm on Thursday 3rd of March 2016 11:08:21 AM

03-03-2016

Registered User

Rebooting redundant VIOs and mirroring of PVs they serve to client LPARs

need to confirm:
we have a system with two VIOs each serving a partition on a local disk to a client LPAR. That client LPAR has them both in a VG which is mirrored (exact). So each disk has a copy of the client LV that the client VG supports. This is the setup that was bequeathed to us by the vendors who set up the system originally, and which we've replicated to further systems.

I'm doing an upgrade cycle on the VIOs. If I reboot one of them after installing the upgrade, I would like

the other VIO to continue serving its instance of the mirrored LV - don't see a reason to anticipate trouble with this
when the rebooted VIO comes back, I expect the client LVM to deal with incongruities between the two copies of the mirrored LV appropriately.

#2 is my concern. What I read about mirror write consistency is that active MWC records writes in the MWC log and reaps that when the VG is varied back on, while passive MWC records that an LV has been opened, and forces a syncvg.

I'm trying to dig up how that applies when I shut down one VIO and thus make one of the client PVs supporting the mirrored client LV disappear for a while, then turn it back on and have it reappear in the mirrored VG. MWC is set to on/active for the mirrored LV.

Should I not worry because this is the correct configuration and this is what it was designed to support ?

Conversely, should I save myself the concern and drive risk to 0 by shutting down the client LPAR ? We have a maintenance window to work with; on the other hand it seems to me this is the kind of scenario that VIO redundancy was meant to address, so I shouldn't have to shut down client LPARs.

TIA...

---------- Post updated 03-03-16 at 11:08 ---------- Previous update was 03-02-16 at 18:09 ----------

well, it worked fine - no bobbles in the filesys

still interested in any views you may have of the above, tx

maraixadm

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fribidi_get_mirror_char

fribidi_get_mirror_char(3)					Programmer's Manual					fribidi_get_mirror_char(3)

NAME

       fribidi_get_mirror_char - get mirrored character

SYNOPSIS

       #include <fribidi.h>

       fribidi_boolean fribidi_get_mirror_char
       (
	    FriBidiChar ch,
	    FriBidiChar *mirrored_ch
       );

PARAMETERS

       FriBidiChar ch
	      Input character.

       FriBidiChar *mirrored_ch
	      Output mirrored character.

DESCRIPTION

       This  function  finds  the  mirrored  equivalent  of a character as defined in the file BidiMirroring.txt of the Unicode Character Database
       available at http://www.unicode.org/Public/UNIDATA/BidiMirroring.txt.

       If  the input character is a declared as a mirroring character in the Unicode standard and has a mirrored equivalent.   The  matching  mir-
       rored character is put in the output, otherwise the input character itself is put.

RETURNS

       If the character has a mirroring equivalent or not.

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_set_mirroring(3),  fribidi_reorder_nsm_sta-
       tus(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_shape_mirroring(3), fribidi_shape(3)

GNU FriBidi 0.19.2						  30 January 2006					fribidi_get_mirror_char(3)