text: To enable access to the auxiliary volume for host operations, you must stop the Metro Mirror 
  relationship by specifying the**-access**parameter. While access to the auxiliary volume for 
  host operations is enabled, the host must be instructed to mount the volume before the 
  application can be started, or instructed to perform a recovery process. 
  
  For example, the Metro Mirror requirement to enable the auxiliary copy for access 
  differentiates it from third-party mirroring software on the host, which aims to emulate a 
  single, reliable disk regardless of what system is accessing it. Metro Mirror retains the 
  property that there are two volumes in existence, but it suppresses one volume while the copy 
  is being maintained. 
  
  The use of an auxiliary copy demands a conscious policy decision by the administrator that a 
  failover is required, and that the tasks to be performed on the host that is involved in 
  establishing the operation on the auxiliary copy are substantial. The goal is to make this copy 
  rapid (much faster when compared to recovering from a backup copy) but not seamless. 
  
  The failover process can be automated through failover management software. The IBM 
  Storwize V7000 provides SNMP traps and programming (or scripting) for the CLI to enable 
  this automation. 