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Normal Multiple Image Facility (MIF) sharing of a chan-
nel is confi ned to a single LCSS. The z890 supports the
spanning of the channels types: IC, HiperSockets, FICON
Express, FICON Express2, OSA-Express, OSA-Express2,
ISC-3s and ICBs (ICB-3 and ICB-4). Note: Spanning of
ESCON channels is not supported.
Channel Spanning
A z890 has a total of 28 I/O slots in one I/O cage. These
slots can be plugged with a mixture of cards providing
the I/O connectivity, networking connectivity, coupling and
cryptographic capability of the server.
Up to 420 ESCON Channels
The high density ESCON feature has 16 ports, 15 of which
can be activated for customer use. One port is always
reserved as a spare which is activated in the event of a
failure of one of the other ports. For high availability the ini-
tial order of ESCON features will deliver two cards and the
active ports will be distributed across those cards. After
the initial install the ESCON features are installed in incre-
ments of one. ESCON channels are available in four-port
increments and are activated using IBM Licensed Internal
Code, Confi guration Control (LIC CC). There is a 75%
increase in ESCON connectivity over z800.
Up to 40 FICON Express Channels
The z890 supports up to 40 FICON Express channels. It
offers a 25% increase in FICON Express channels over the
z800. FICON Express is available in long wavelength (LX)
and short wavelength (SX) features. Each FICON Express
feature has two independent ports which support two
channels per card. The LX and SX cannot be intermixed on
a single feature. The maximum number of FICON Express
features which can be installed in the I/O cage is 20.
The z890 supports up to 40 FCP channels for attach-
ment to Small Computer System Interface (SCSI) disks in
a Linux environment. The same two-port FICON Express
feature card used for FICON Express channels can also
be used for Fibre Channel Protocol (FCP) channels. FCP
channels are enabled on these existing features via a
Licensed Internal Code (LIC) with a unique mode of
operation and CHPID defi nition (FCP). FCP is available in
LCSS0 LCSS1
CHPID 22 CHPID 22
ZOS2 ZOS3 ZOS4 ZOS5 LNX1ZOS1
HiperSockets
z890 Channels and I/O Connectivity