
596 DS8800 Performance Monitoring and Tuning
Creating more than one FlashCopy SE relationship for a source volume increases the
overhead, because each first change to a source volume track must be copied several times
for each FlashCopy SE relationship. Therefore, keep the number of concurrent FlashCopy SE
relationships to a minimum, or test how many relationships you can have without affecting
your application performance much. From a performance standpoint, avoiding multiple
relationships also applies to normal FlashCopy.
There are no restrictions on the amount of virtual space or the number of SE volumes that
can be defined for either z/OS ...