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11. Fibre-channel LUN-access control
Communications for ESS Web Copy Services
This section gives guidelines for filling out the Copy Services work sheet.
The ESS clusters that are part of a Copy Services Server Group use the TCP/IP
network to communicate. Each ESS cluster needs to have an IP address assigned
to it. You enter this information on the Communication Resources (Copy Services)
work sheet.
IBM recommends that you use a Domain Name Server (DNS) for name resolution.
DNS provides the following advantages:
v It resolves the names of the participating ESS clusters
v It allows the Copy Services code to communicate with remote sites
v A domain name provides a unique, stable address for communication; the dotted
Figure 11 on page 74 shows ESS Copy Services server group in a DNS
configuration.
1 to 4
b. Enter the number of times the ESS is to send a DASD SIM.
0 to 9
c. Enter the SIM-severity reporting level for media (data check) SIMs.
2 or 4
d. Enter the number of times the ESS is to send a media SIM.
0 to 9
e. Enter the SIM-severity reporting level for a storage server SIM.
2, 3, or 4
f. Enter the number of times the ESS is to send the storage-server SIM.
0 to 9
A switch on the ESS determines whether hosts have access to all LUNs over
fibre channel, or whether access is restricted.
a. Switch setting:
Check Restricted if you want to limit access to LUNs to hosts that you
define in the ESS Specialist interface. Restricted is the default setting.
Check Permit All if all hosts are to have access to all LUNs.
decimal address can be changed
Chapter 4. Planning for communication
73
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