All
I/O
operations
that
are
managed
by
the
nodes
in
an
I/O
group
are
cached
on
both
nodes.
Each
virtual
volume
is
defined
to
an
I/O
group.
To
avoid
any
single
point
of
failure,
the
nodes
of
an
I/O
group
are
protected
by
independent
uninterruptible
power
supplies
(UPSs).
There
are
two
different
UPSs.
The
UPSs
are
called
the
2145
uninterruptible
power
supply-1U
(2145
UPS-1U)
or
2145
uninterruptible
power
supply
(2145
UPS)
units.
A
SAN
Volume
Controller
I/O
group
takes
the
storage
that
is
presented
to
the
SAN
by
the
storage
subsystems
as
MDisks
and
translates
that
storage
into
logical
disks,
known
as
VDisks,
that
are
used
by
applications
on
the
hosts.
Each
node
must
reside
in
only
one
I/O
group
and
provide
access
to
the
VDisks
in
that
I/O
group.
Figure
7.
SAN
Volume
Controller
2145-4F2
node
svc00074
Figure
8.
SAN
Volume
Controller
2145-8F2
and
SAN
Volume
Controller
2145-8F4
node
2
IBM
System
Storage
SAN
Volume
Controller:
Installation
Guide
Содержание 2145-4F2
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