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Full Discussion: VxVM breaking mirror for migrating storage
Top Forums UNIX for Advanced & Expert Users VxVM breaking mirror for migrating storage Post 302895551 by keelba on Tuesday 1st of April 2014 09:24:00 AM
Old 04-01-2014
VxVM breaking mirror for migrating storage
We are in the process of migrating storage from one array to another. I know the commands I would use in LVM but I am not very familiar with VxVM.

The goal is to attach the new LUNs from the new array and add them to the disk group. Then mirror the data online to these new LUNs using VxVM mirroring. Once the mirroring has completed we would break the mirror from the old LUNs and be running on the new storage.

The catch here is that the customer is not 100% sure they want to be on the new array and wants the ability to failback quickly if there are problems, such as performance. There are several terabytes of data so the original sync could be quite time consuming. If, for example, it takes 12 hours and the customer complains about the performance, we want to get back on the old disks as soon as possible, not after waiting another 12 hours.

In LVM, I could do this simply with the lvsplit and lvmerge commands. The lvsplit breaks the mirror into a new lvol and keeps a bitmap of all the changes so that resyncing the mirror happens much more quickly, very similarly to a snapshot. If, after a couple of days, the customer is satisfied, we would completely remove the old LUNs and be done with the project.

Can anyone help me with the commands to do the same in VxVM? I found conflicting answers on Google. One says an exact equivalent to lvsplit/merge is the command vxassist snapshot and vxassist snapback. Antother sites suggests using vxplex detach and vxplex attach. So if anyone has suggestions on the best way to accomplish this, I'd really appreciate it.

One thing I need an answer for, is where the bitmap is stored and how to make sure we do not fill it up and lose it. This is an active database so the delta might be quite large for all we know after a few days.
 

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LEARN ABOUT HPUX

vxinstall

vxinstall(1M)															     vxinstall(1M)

NAME

       vxinstall - menu-driven Veritas Volume Manager initial configuration procedure

SYNOPSIS

       vxinstall

DESCRIPTION

       The  vxinstall utility provides a menu driven interface to configure Veritas Volume Manager (VxVM).  If you install the Veritas Volume Man-
       ager software package using the operating system's package administration commands, you can run vxinstall to configure VxVM for initial use
       on your system.

       Note: If you use the Veritas software installation scripts, do not run this utility.

OPERATIONS

       Licensing
	    vxinstall  first asks if you want to view the Veritas licenses already installed on the system.  Answering "yes" is equivalent to exe-
	    cuting the vxlicrep command (see vxlicrep(1)).

	    You are then asked if you want to add licenses for other Veritas products.	Answering "yes" is equivalent  to  running  the  vxlicinst
	    command (see vxlicinst(1)).  and entering a license key.

       Enclosure-Based Naming
	    You  can choose whether you want to use disk access names that are based on the device names assigned by the operating system, or that
	    are based on names that you assign to enclosures.

       System-Wide Default Disk Group
	    You can enter the name for the default disk group (defaultdg).  This is an alias for the disk group name that should be assumed if the
	    -g	option is not specified to a command, or if the VXVM_DEFAULTDG environment variable is undefined.  By default, defaultdg is set to
	    nodg (that is, no disk group).

NOTES

       From release 4.0 of VxVM, it is no longer necessary to run vxinstall to configure the rootdg disk group.  Disks	and  disk  groups  may	be
       added  to  VxVM	by  running  commands such as vxdiskadm(1M) or by using the graphical user interface without first running vxinstall.  The
       operation of VxVM does not require any disk groups to have been configured, and a disk group named rootdg does not need to  be  present	on
       the system.  Any disk group may be configured as the default disk group that is to be used with VxVM commands.  Any disk group named rootdg
       has no special significance to VxVM. See the vxdg(1M) manual page for further details.

SEE ALSO

       vxdctl(1M), vxdg(1M), vxdiskadm(1M), vxintro(1M), vxlicinst(1), vxlicrep(1)

VxVM 5.0.31.1							    24 Mar 2008 						     vxinstall(1M)
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