Backup and restore Post: 302563224

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Operating Systems AIX Backup and restore Post 302563224 by rbatte1 on Monday 10th of October 2011 11:29:26 AM

10-10-2011

Moderator

Hmmm, not a good starting point.

The good news is that the SAN definition of PP size should be irrelevant. It might cost you a little bit of usable space, but that's probably minimal. Your problem will be that you are moving from AIX LV mirrors to hardware mirrors (however the SAN protects the allocated disk) so I have a question about you backup process.

Do you use mkszfile before each mksysb? If so, then you may have got a way round things, but you are still exposing yourself to risks of hdisk0 failing during the backup before the mirror on hdisk1 is complete. Removing the mirrors will clear the disk, so it's not like a split mirror that some other systems have or Veritas can provide. You must also remember to use bosboot and check the bootlist after the mirror.

It might be better to:-

Run mksysfile to generate an up-to-date configuration file, mirrors and all.
Edit /image.data and set all COPIES= 2 statements to be COPIES= 1
Run mksysb

Be aware that your tape will only create a single copy, so if you recover to a machine without hardware protected boot disk, you would need to manaully mirror afterwards, including the bosboot and edit of the bootlist If you have to recover to your live system, install to a single disk rather that risk the restore spreading out over both disks.

For your data volume group, it is unclear if the logical volumes are mirrored or how you back them up. If not mirrored, then you are exposed to hardware failure at any time. If they are, then you can perform similar actions, but it would be good to know the backup method for the data before I leap into something. What would your DR recovery procedure be like too? It's all well and good to say you have a backup, but have you tested your restore plan?

Let me know what you have in place and I will see about other suggestions to further protect you. Is it savevg, tar, cpio or perhaps a 3rd party backup tool?

Robin
Liverpool/Blackburn
UK

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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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