Guidelines and Limitations
To design CFS regions for FC-Redirect, follow these
guidelines:
• Ensure
the CFS region configuration for FC-Redirect can be applied to all FC-Redirect-based
applications. The applications include SME, Cisco DMM, and any future
applications.
• Ensure
that all FC-Redirect-capable switches that are connected to the hosts,
targets, and the application switches (switches with MSM-18/4 modules
in a cluster) are configured in the same region.
• If
there are multiple SME clusters in a region, a target can be part of
the SME configuration in only one cluster. To change the target to a
different cluster, the configuration in the first cluster must be deleted
before creating the configuration in the second cluster.
• All
switches in the region must have a common VSAN.
• For
existing SME installations, refer to “Configuring CFS Regions For FC-Redirect”
for steps on migrating to CFS regions.
• Remove
all instances of the previous configurations when a switch is moved to
a region or moved out of a region.
To configure a CFS region, refer to the “Configuring CFS Regions For FC-Redirect”.
Table 1-2
lists the SME configurations and the corresponding limits.
Table 1-2 SME Tape Configuration Limits
Configuration
|
Limit
|
Number of clusters per switch
|
1
|
Switches in a cluster
|
4
|
Number of fc-redirect capable switches in a fabric
|
10
|
Fabrics in a cluster
|
2
|
Modules in a switch
|
11
|
Cisco MSM-18/4 modules in a cluster
|
32
|
Initiator-Target-LUNs (ITLs)
|
1024
|
LUNs behind a target
|
32
|
Host and target ports in a cluster
|
128
|
Number of hosts per target
|
128
|
Tape backup groups per cluster
|
4
|
Volume groups in a tape backup group
|
32
|
Keys in a Tape volume group
|
8000
|
Number of disk groups
|
128
|
Number of SME disks (LUNs)
|
2000
|
Cisco Key Management Center (number of keys)
|
32,000
|
Targets per switch that can be FC-redirected
|
32
|
IT connections per SME interface (soft limit)
|
256
Note Beyond
this limit, a syslog message will be displayed. It is recommended that
you provision more SME interfaces in the cluster.1
|
IT connections per SME interface (hard limit)
|
512
Note Beyond
this limit, new IT connections will not be assigned to that particular
SME interface and a critical syslog will be displayed.2
|
Table 1-3 SME
Disk Configuration Limits
Configuration
|
Per Cluster
|
Per Switch
|
Per Crypto Node
|
Number of clusters
|
NA
|
2
|
1
|
Number of physical fabrics
|
2
|
NA
|
NA
|
Number of switches
|
8
|
NA
|
NA
|
Number of modules (line cards—SSN 16 or MSM-18/4
modules)
|
NA
|
11
|
NA
|
Cisco SME interfaces (crypto nodes used for encryption)
|
32
|
32
|
NA
|
Initiator-Target-LUNs (ITLs)
|
2048
|
2048
|
512
|
LUNs behind a target
|
512
|
512
|
512
|
Number of initiator ports
|
128
|
NA
|
NA
|
Number of target ports
|
128
|
NA
|
NA
|
Maximum number of IT nexus
|
128
|
NA
|
NA
|
Number of paths per LUN (physical paths per SME
disk)
|
8
|
8
|
8
|
Number of disk groups
|
128
|
128
|
128
|
Number of SME disks (LUNs)
|
2048
|
2048
|
512
|
Cisco Key Management Center (KMC) number of keys
|
32,000
|
32,000
|
32,000
|
Maximum number of concurrent data preparations (offline
data preparations)
|
NA
|
NA
|
64
|
Total number of Disk key replication relationships
|
2048
|