Chapter 16. IBM TotalStorage m-type family real-life routing solutions 447
We round this up to 6 ms to account for the packet transmission time over the
155 Mbps OC-3 link.
16.3.3 Normal operation
In normal operation, the production servers use only the DS8100 disks in the
primary site. The DR servers are connected to the DS8100 in the DR site, but do
not have the disks mounted or any applications running. The development
servers use the DS6800 disks in the primary site and some capacity from the
DS8100 in the primary site.
For the DS8100 disk subsystems, four of the eight ports are used for host
attachments; the remaining four are used for the Global Mirroring. The ports
used for Global Mirroring are directly connected to the routers.
In addition ...