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Full Discussion: odd behaviour of app writes to mirrored volumes
Operating Systems Solaris odd behaviour of app writes to mirrored volumes Post 302366444 by mrmurdock on Thursday 29th of October 2009 01:19:08 PM
Old 10-29-2009
odd behaviour of app writes to mirrored volumes
Hi,
Normally, I setup my volumes under Solaris (doesnt matter, 8 or 10),
as vxassist -g dg01 -U gen make vol01 500m dg0101, then I do a mirror
vxassist -g dg01 mirror vol01 dg0102.

Which is legal and does work, however, when the primary dg01 array (or simply in this case, the volume) disappears for some reason, the app does not seem to continue to write to the mirror and fails (this is oracle RAC) or if vol01 picks up a bad sector, the mirror write fails on the other side (dg0102).
The arrays are on San switches and are multipathed. Is my mirroring wrong?
 

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LEARN ABOUT HPUX

lvsync

lvsync(1M)																lvsync(1M)

NAME

       lvsync - synchronize stale mirrors in LVM logical volumes

SYNOPSIS

       lv_path ...

   Remarks
       This  command  requires	the  installation  of the optional HP MirrorDisk/UX software (not included in the standard HP-UX operating system)
       before it can be used.

       If the logical volume input arguments belong to a combination of volume groups version 1.0 and 2.0 or higher, the arguments may not be pro-
       cessed in the order they are listed on the command line.

DESCRIPTION

       The command synchronizes the physical extents of each logical volume specified by lv_path.  Synchronization occurs only on physical extents
       that are stale mirrors of the original logical extent.  The synchronization process can be time consuming, depending on the hardware  char-
       acteristics and the amount of data.

   Arguments
       recognizes the following argument:

	      lv_path	The block device path name of a mirrored logical volume.

   Options
       recognizes the following option:

	      Perform mirror synchronization of logical volumes within a volume group
			using  multiple parallel threads.  Logical volumes belonging to different volume groups will be synchronized serially.	It
			is possible that logical volumes start and/or complete their synchronization in a different order than	specified  on  the
			command line.

			The maximum number of threads used can be controlled using the system tunable.

			NOTE: This option has no effect if the volume group is activated in shared mode.

EXTERNAL INFLUENCES

   Environment Variables
       determines the language in which messages are displayed.

       If is not specified or is null, it defaults to "C" (see lang(5)).

       If any internationalization variable contains an invalid setting, all internationalization variables default to "C" (see environ(5)).

EXAMPLES

       Synchronize the mirrors on a logical volume:

       Synchronize the mirrors on three logical volumes using multiple parallel threads:

       Add mirror copies using with the option for three logical volumes, and then synchronize mirrors on these three logical volumes using multi-
       ple parallel threads.

       First, add mirror copies to each logical volume using with the option:

       Now synchronize the mirrors on these three logical volumes using multiple parallel threads:

SEE ALSO

       lvdisplay(1M), lvextend(1M), vgsync(1M).

						    Requires Optional HP MirrorDisk/UX Software 					lvsync(1M)
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