TCP/IP Connectivity
186 SL8500: Systems Assurance Guide • July 2011
E24254-01
Differences
1.
Dual TCP/IP (SL8500):
Provides
two separate
host connections between
the host software (ACSLS or ELS/HSC) and the library controller.
•
Dual TCP/IP is an
active/active
design—when both communication
paths are available, ACSLS and ELS/HSC use both of them to
communicate with the SL8500.
•
In the SL8500, the HBC card provides
all
of the functions of the LMU,
the LCU, and the library communications facility (LCF).
•
ELS/HSC uses each path alternately.
•
ACSLS continuously monitors both connections using one path as
primary and occasionally using the second path.
•
This helps ensure that both paths are working properly so that if one
fails, there is a high degree of confidence that the other path is
operational.
•
Both ELS/HSC and ACSLS detect when a path is unavailable and
automatically re-send transmissions over the other path.
•
The SL8500 also re-sends transmissions over the other path when a
path becomes unavailable. After retrying for four to five minutes,
ACSLS, ELS/HSC, and the SL8500 will mark a path as unavailable
and just use the remaining path.
•
When a path is marked as unavailable, ACSLS, ELS/HSC, and the
SL8500 continues to monitor the path. When the path becomes
available again, ACSLS, ELS/HSC, and the SL8500 will automatically
re-connect to the path.
Terminology
ARP
—Short for Address Resolution Protocol, a network layer protocol that
converts IP address into physical addresses, like Ethernet addresses.
Address
Resolution Protocol
(ARP) Takeover allows traffic to be redirected from a failing
OSA-Express connection to another OSA-Express connection.
Dual path/Dual TCP/IP
—two distinct physical paths within a network
architecture that interconnect two host systems.
Ethernet
—a local-area network (LAN) architecture that serves as the basis for
the IEEE 802.3 standard. Ethernet is one of the most widely implemented LAN
standards.
Gateway
—A node on a network that serves as an
entrance
to another
network. A gateway is a device that
routes
traffic from one network to another
network.
Summary of Contents for StorageTek StreamLine SL8500
Page 4: ...Summary of Changes iv SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 12: ...Contents xii SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 18: ...Tables xviii SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 76: ...Introduction 56 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 97: ...E24254 01 Chapter 3 Site Survey Forms 77 Site Survey Forms Figure 21 Content Management Plan ...
Page 137: ...E24254 01 Chapter 4 Site Preparation 117 Site Preparation ...
Page 138: ...Site Preparation 118 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 198: ...Electrical Conversions 176 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 206: ...Comparisons 184 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 233: ...E24254 01 Appendix H Partitioning 211 Partitioning Make copies as necessary ...
Page 240: ...Partitioning 218 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 251: ...E24254 01 Appendix J Work Sheets 229 Work Sheets Figure 73 Content Management Work Sheet ...
Page 276: ...Index 254 SL8500 Systems Assurance Guide June 2011 E24254 01 ...
Page 277: ......
Page 278: ...Oracle Corporation Worldwide Headquarters 500 Oracle Parkway Redwood Shores CA 94065 U S A ...