FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Environment Planning Manual (620-000124-500, April 2005)
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McDATA Products in a SAN Environment - Planning Manual
Planning Considerations for Fibre Channel Topologies
• 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 illustrates performance tuning for a simple fabric using
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.
Figure 3-15 Fabric Performance Tuning
Interswitch Link
Fabric Connection
6,000 IOPS
Tier 2 Storage
P
W
R
E
R
R
1
0
2
46
8
1
01
2
1
4
1
6
1
8
202
2
2
4
2
62
8
3
0
3
5
7
9
11
1
3
15
17
1
9
21
2
325
2
7
2
9
31
R
S
T
1
0
/
1
0
0
T
M
E
R
R
P
W
R
R
S
T
10
/10
0
T
M
E
R
R
P
W
R
R
S
T
1
0/1
00
T
M
E
R
R
P
W
R
R
S
T
10
/
10
0
T
M
E
R
R
P
W
R
R
S
T
10/1
00
T
M
E
R
R
P
W
R
R
S
T
1
0
/
10
0
T
M
30 MBps
2,000 IOPS
20 MBps
1,500 IOPS
10 MBps
1,000 IOPS
11 to 1 Fan-Out Region
11,000 IOPS
11 Total
Servers
6 Total
Servers
3 Total
Servers
Local Tier 1 Devices
40 MBps
2,000 IOPS
2,000 IOPS
TM
6 to 1 Fan-Out Region
9,000 IOPS
3 to 1 Fan-Out Region
6,000 IOPS
Tier 2 Servers