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Planning Considerations for Fibre Channel Topologies
3
McDATA Products in a SAN Environment - Planning Manual
3-36
•
Device output in Gbps does not oversubscribe ISLs, leading to
fabric congestion.
•
Device output in IOPS does not result in a connectivity scheme
that exceeds fan-out ratios, leading to port congestion.
Figure 3-15
appropriate ISL connectivity, device locality, and fan-out regions for
device connectivity. The fabric is comprised of one core director and
six edge switches. Tier 2 servers connect to three switches at the
bottom of the figure, and Tier 2 storage devices connect to three
switches at the top of the figure.
11 to 1 Fan-Out Region
11,000 IOPS
TM
ERR
PWR
6,000 IOPS
31
29
27
25
TM
23
21
19
30
17
15
13
28
26
24
11
9
7
22
20
18
5
3
1
16
14
12
PWR
10
8
6
ERR
4
2
0
11 Total
Servers
10 MBps
1,000 IOPS
Interswitch Link
Fabric Connection
Fabric Performance Tuning
Figure 3-15
illustrates performance tuning for a simple fabric using
Tier 2 Storage
6 to 1 Fan-Out Region
9,000 IOPS
TM
PWR
ERR
TM
PWR
ERR
6 Total
Servers
20 MBps
1,500 IOPS
Tier 2 Servers
3 to 1 Fan-Out Region
6,000 IOPS
TM
Local Tier 1 Devices
2,000 IOPS
40 MBps
2,000 IOPS
TM
3 Total
Servers
30 MBps
2,000 IOPS
PWR
ERR
PWR
ERR
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