Latency; Feature Licenses; Multiple Switch Fabrics; Port-To-Port Latency - HP StorageWorks SN6000 Installation And Reference Manual

Latency

Latency is a measure of how fast a frame travels through a switch from one port to another. The factors that
affect latency include transmission rate and the source/destination port relationship
Table 6

Port-to-port latency

Destination Rate
Gb/s
Source
2
Rate
4
8
10
20
1 Based on minimum frame size of 36 bytes. Latency increases for larger frame sizes.

Feature licenses

A license key provides a way to expand the capabilities of your switch and fabric as your needs grow.
Applying a license key is not disruptive, nor does it require a switch reset. To order a license key, contact
your switch distributor or your authorized reseller. For more information, see
keys" (page 46). The following license key features are available:
• The HP StorageWorks SN6000 Stackable 20Gb ISL Upgrade LTU enables the XPAK ports to transmit at
20 Gb/s instead of the default 10 Gb/s.
• The HP StorageWorks SN6000 Stackable 4-port FC Switch Upgrade LTU enables additional SFP ports
in increments of four on the HP StorageWorks SN6000 Stackable 8Gb 12-port Single Power FC Switch
for totals of 16, 20, or 24 ports.

Multiple switch fabrics

By connecting switches to one another, you can expand the number of available ports for devices. Each
switch in the fabric is identified by a unique domain ID, and the fabric can automatically resolve domain ID
conflicts. Because the Fibre Channel ports are self-configuring, you can connect SN6000 Fibre Channel
Switches together in a wide variety of topologies. When planning your fabric, consider your topology and
cabling requirements. Transparent routing to a legacy fabric is also possible using TR_Ports.
For more information about Storage Area Network (SAN) connectivity, see the SAN Design Reference
Guide available at the HP website: http://www.hp.com/go/SANdesignguide.
22
2 4
< 0.6 μsec < 0.7 μsec
< 0.4 μsec < 0.3 μsec
< 0.3 μsec < 0.2 μsec
< 0.3 μsec < 0.3 μsec
< 0.3 μsec < 0.2 μsec
8
1 1
< 0.6 μsec
1
< 0.4 μsec
< 0.2 μsec
< 0.2 μsec
< 0.2 μsec
(Table 6).
10 20
< 0.6 μsec1 < 0.6 μsec1
< 0.4 μsec1 < 0.3 μsec1
< 0.2 μsec1 < 0.2 μsec1
< 0.2 μsec < 0.2 μsec1
< 0.2 μsec < 0.2 μsec
"Installing feature license