8464ch02_Architecture.fm Draft Document for Review February 7, 2020 3:15 pm Call Home events send data that is related to the problem to the IBM product support group.  This data includes the following information: GLYPH<SM590000> Overall system information, such as system serial number and Licensed Internal Code  level  GLYPH<SM590000> Details of the error GLYPH<SM590000> Error logs that can help to resolve the problem After the Call Home is received by the assigned IBM support group, the associated  information is examined. Following analysis, an appropriate course of action is defined to  resolve the problem. For example, an IBM SSR might be sent to the site location to take the  corrective actions. Alternatively, the problem might be repaired or resolved remotely by IBM  support personnel through a broadband (if available) or telephone (if necessary) connection. The TS3000 Total Storage System Console (TSSC) is the subsystem component responsible  for placing the service call or Call Home when necessary. Since model 93p and release  TSSC V4.7, only broadband connection is supported. 2.2 Stand-alone cluster: Components, functions, and features In general, any cluster can be used as a stand-alone cluster. The TS7700 features several  internal characteristics for High Availability (DDP RAID 6 protection, dual power supplies, and  so forth). However, a grid configuration can be configured for both more high availability (HA)  and Disaster Recovery (DR) functions with different levels of business continuance. For more  information, see Chapter 3, “IBM TS77 00 usage considerations” on page 109. In this section, general information is provided about the components, functions, and features  that are used in a TS7700 environment. The general concepts and information are also  available in 2.2, “Stand-alone cluster: Components, functions, and features” on page 28.  For more information about deviations and the multi-cluster grid, see 2.4, “Multi-cluster grid  configurations: Components, functions, and features” on page 59. 2.2.1 Views from the Host: Library IDs Composite library All host interaction with tape data in a TS7700 is through virtual volumes and virtual tape  drives.  You must be able to identify the logical entity that represents the virtual drives and volumes,  but also address the single entity of a physical cluster. Therefore, two types of libraries are  available: a composite library and a distributed library. Each type is associated with a library  name and a Library ID. The  composite library  is the logical image of the stand-alone cluster or grid that is presented  to the host. All logical volumes and virtual drives are associated with the composite library. In  a stand-alone TS7700, the host sees a logical tape library with up to 31 3490E tape CUs.  These CUs each have 16 IBM 3490E tape drives and are connected through 1 - 8 FICON  channels. The composite library is defined through the Interactive Storage Management  Facility (ISMF). A composite library is made up of one or more distributed libraries. 28  IBM TS7700 Release 5.0 Guide