A highly available and expandable, rack-dense, 2U dual-socket SMP server, for application
serving in Web environments
Please see the Legal Information section for important notices and information.
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improved fault isolation.
For increased availability, the x3650 offers two additional (but mutually exclusive) levels of IBM
Active Memory protection: online
memory mirroring
, and
online hot-spare
memory
.
Memory mirroring
works much like disk mirroring. The total memory is divided into two channels.
Data is written concurrently to both channels. If a DIMM fails in one of the DIMMs in the primary
channel, it is instantly disabled and the mirrored (backup) memory in the other channel becomes
active (primary) until the failing DIMM is replaced. Mirroring can be accomplished with multiples
of
four
DIMMs (one pair per memory channel).
When
online
hot-spare memory
is enabled, using single and/or dual-rank DIMMs
one rank
is
set aside per branch as online spares in case one of the other ranks fails.
The spare rank must
have capacity at least that of the largest active rank.
Up to
40GB
(using 12
single
-rank 4GB
DIMMs) or
44GB
(using 12
dual
-rank 4GB DIMMs) of memory is available when the hot-spare
feature is active. (The lowest-numbered rank of those with the highest capacity in each branch
is used for the hot-spares.)
Either of these features requires operating system support.
When multiples of four DIMMs (4/8/12) are installed, the x3650 operates in
four-way
interleaved
mode, for higher performance. When only
two
DIMMs are used, the system
defaults to
two-way interleaved
mode.
DIMMs must be installed in pairs. Memory is available in kits consisting of
two
512MB
,
1GB,
2GB
or
4GB
DIMMs.
High-Performance Adapter Slots
The x3650 provides
four
physical
x8
(“by 8”)
PCI-E (PCI Express)
adapter slots standard. Each
is capable of supporting
x1/x4/x8
adapters.
Slot
1
is
full-length/full-height
and
Slot 2
is
half-
length/full-height
.
Electrically
they are x8 slots as well (meaning that they operate at full
x8
4GBps
speeds).
Slots 3
and
4
are
low-profile/full-length
slots, wired for
x4
speeds (
2GBps
).
This provides the flexibility to use x8 cards in those slots (although running at x4 speeds.) If
desired, the riser card containing slots
1
and
2
may optionally be replaced with one that
provides
two
64-bit
(1Gbps)
133MHz PCI-X
slots instead, one
full-length/full-height
and one
half-length/full-height
.
PCI-Express
is a high-performance, low-latency, next-generation serial I/O bus that is rapidly
replacing the older parallel PCI and PCI-X buses. A
x8
PCI-E adapter offers approximately
four
times
the maximum throughput of a 133MHz PCI-X adapter
4
. (A
x1
adapter offers throughput
similar to a
66MHz
PCI-X slot.)
Because the
SAS
,
ServeRAID-8k
and
8k-l
, dual
Gigabit Ethernet
,
systems management
and
video
controllers are integrated onto the system board, the four adapter slots are all
available
,
which offers you a wide degree of latitude in expansion options.
Hot-Swap/Redundant Components
System availability is maximized through the extensive use of hot-swap and redundant
components, including:
•
Redundant memory
protection (with
Chipkill protection
plus,
memory mirroring
or
online
hot-spare
memory enabled)
•
Hot-swap, redundant
hard disk drives
(with
RAID-0/1/10
protection standard and RAID-
1E/5/6
optional)
•
Hot-swap, redundant power supplies
(optional)
•
Hot-swap, redundant cooling fans
(optional)
Large HDD Storage Capacity
The x3650 offers a choice of disk storage, supporting up to
six
(
3.5
-inch) or
eight
(
2.5
-inch)
hot-swap
high-performance Serial-Attach SCSI (
SAS
) drives, or up to
six
(
3.5
-inch)
hot-swap
Serial-ATA (
SATA
) drives:
3.5-inch SAS
•
15,000
RPMs — 73.4,
146.8
or
300GB
(
1.8TB maximum
)
2.5-inch SAS
•
10,000
RPMs — 73.4 or
146.8GB
(
1.17TB
)
•
15,000
RPMs —
73.4GB (587.2GB)
3.5-inch SATA
•
7,200
RPMs — 160, 250, 500, 750GB or
1TB
(
6.0TB
)
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Actual throughput will depend on the adapter vendor’s implementation.
