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Emulations of drives connected to OS/390 host adapters XTCC
8.9 Emulations of drives connected to OS/390 host adapters
8.9.1 Information on emulations
The ESCON channel adapter only has emulations of drives of the types IBM-3490E and
Fujitsu F6473K. In the Fujitsu-Siemens Computers product lists, 3490-E devices are listed
under the number 3590 and must not be confused with 3590 tape drives from IBM.
Each emulation is assigned to a virtual tape drive. It is represented by a block connected to
one or two channel adapters. Within the block, the emulation type (IBM-3490), emulation
name (O3, etc.) and, in the case of virtual drives, the number of the logical device (L000,
L001, etc.) are displayed.
This type of emulation consists of two processes, one for communicating with the host
adapter and the other for communicating with the logical device or RAID system. These
processes are referred to as the channel process and the device process.
Normally, both processes have the same status. However, there are situations in which this
will not be the case. If this occurs, the top half of the block shows the status of the channel
process, while the bottom half shows the status of the device process. The process status
is indicated by the colors pink (stopped), green (running), green/brown (running with the
trace switched on), and red (configuration error).
XTCC represents the integration of the virtual drive in the CentricStor system:
– the connection to one or both ESCON host adapters
– the device names in the ESA/390 or BS2000 host
The connection lines are colored purely for the purposes of clarity.
In the event of an error (e.g. because of the failure of an ESCON channel) the connections
concerned are indicated by dashed lines.