FastResync provides two fundamental enhancements to VxVM:
vxplex
or vxassist
. A returning mirror is a mirror that was previously detached and is in the process of being re-attached to its original volume as the result of the vxrecover
or vxplex
att
operation.) When a mirror returns to service, only the updates that it has missed need to be re-applied to resynchronize it. This requires much less effort than the traditional method of copying all the stored data to the returning mirror.
Once FastResync has been enabled on a volume, it does not alter how you administer mirrors. The only visible effect is that repair operations conclude more quickly.