IBM 7979B1U User Manual - Page 86

Online-spare, memory

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When you use memory mirroring, you must install two pairs of DIMMs at a time. The four DIMMs in each group must be identical. See Table 4 for the DIMM connectors that are in each group. Table 4. Memory mirroring DIMM installation sequence Group DIMM connectors 1 1, 4, 7, and 10 2 2, 5, 8, and 11 3 3, 6, 9, and 12 Table 5. Memory mirroring DIMM functions Group Active DIMMs 1 1, 4 2 2, 5 3 3, 6 Mirroring DIMMs 7, 10 8, 11 9, 12 Online-spare memory The server supports online-spare memory. This feature disables the failed memory from the system configuration and activates an online-spare pair of DIMMs to replace the failed active DIMM pair. Online-spare memory reduces the amount of available memory. Before you can enable this feature, you must install up to two additional pairs of DIMMs. The online-spare DIMM pairs must be the same speed, type, and the same size as, or larger than, the largest active DIMM pairs. Enable online-spare memory through the Configuration/Setup Utility program. The BIOS code assigns the online-spare DIMM pairs according to your DIMM configuration. Online-sparing is enabled on a memory branch basis; the BIOS code does not enable online-sparing on a branch that cannot support online-sparing. See the illustration on page 68 for the memory branch structure. DIMM ranks are online-spared if the DIMMs are installed according to the rules in Table 6 on page 71 or Table 7 on page 71. Note: POST gives a warning message when online-sparing cannot be enabled on both branches. However, no warning message is given when online-sparing is enabled on one branch and disabled on the other. Online-spare configurations are supported for each branch. See Table 6 on page 71 and Table 7 on page 71 for the online-spare DIMM connector assignments. Important: Table 6 on page 71 shows the basic DIMM online-spare scheme. If the BIOS code level is version 1.04 or later, you can install the DIMMs according to the alternative scheme, shown in Table 7 on page 71, instead. 70 System x3650 Type 7979: User's Guide

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When
you
use
memory
mirroring,
you
must
install
two
pairs
of
DIMMs
at
a
time.
The
four
DIMMs
in
each
group
must
be
identical.
See
Table
4
for
the
DIMM
connectors
that
are
in
each
group.
Table
4.
Memory
mirroring
DIMM
installation
sequence
Group
DIMM
connectors
1
1,
4,
7,
and
10
2
2,
5,
8,
and
11
3
3,
6,
9,
and
12
Table
5.
Memory
mirroring
DIMM
functions
Group
Active
DIMMs
Mirroring
DIMMs
1
1,
4
7,
10
2
2,
5
8,
11
3
3,
6
9,
12
Online-spare
memory
The
server
supports
online-spare
memory.
This
feature
disables
the
failed
memory
from
the
system
configuration
and
activates
an
online-spare
pair
of
DIMMs
to
replace
the
failed
active
DIMM
pair.
Online-spare
memory
reduces
the
amount
of
available
memory.
Before
you
can
enable
this
feature,
you
must
install
up
to
two
additional
pairs
of
DIMMs.
The
online-spare
DIMM
pairs
must
be
the
same
speed,
type,
and
the
same
size
as,
or
larger
than,
the
largest
active
DIMM
pairs.
Enable
online-spare
memory
through
the
Configuration/Setup
Utility
program.
The
BIOS
code
assigns
the
online-spare
DIMM
pairs
according
to
your
DIMM
configuration.
Online-sparing
is
enabled
on
a
memory
branch
basis;
the
BIOS
code
does
not
enable
online-sparing
on
a
branch
that
cannot
support
online-sparing.
See
the
illustration
on
page
68
for
the
memory
branch
structure.
DIMM
ranks
are
online-spared
if
the
DIMMs
are
installed
according
to
the
rules
in
Table
6
on
page
71
or
Table
7
on
page
71.
Note:
POST
gives
a
warning
message
when
online-sparing
cannot
be
enabled
on
both
branches.
However,
no
warning
message
is
given
when
online-sparing
is
enabled
on
one
branch
and
disabled
on
the
other.
Online-spare
configurations
are
supported
for
each
branch.
See
Table
6
on
page
71
and
Table
7
on
page
71
for
the
online-spare
DIMM
connector
assignments.
Important:
Table
6
on
page
71
shows
the
basic
DIMM
online-spare
scheme.
If
the
BIOS
code
level
is
version
1.04
or
later,
you
can
install
the
DIMMs
according
to
the
alternative
scheme,
shown
in
Table
7
on
page
71,
instead.
70
System
x3650
Type
7979:
User’s
Guide