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Workhorse 2-socket dual and quad-core
Intel Xeon blade server
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5.
at 667MHz) for faster access, and provides Active Memory features, including advanced
Chipkill memory protection (using 1GB or larger DIMMs), for up to 16X better error correction
than standard ECC memory. The HS21 supports up to 16GB of memory in four DIMM slots.
Adding a 30mm Memory and I/O Expansion Unit doubles the memory support to 32GB in
eight DIMM slots.
The fully buffered memory in the HS21 provides up to triple the memory bandwidth (up to
21.3GBps in four channels of PC2-5300 fully-buffered DIMMs vs. a maximum of 6.4GBps in two
channels of unbuffered PC2-3200 memory. By performing reads and writes simultaneously, it
eliminates the previous memory read-to-write blocking latency. In addition, it also offers
innovative data reliability and security features to help improve data integrity, including
enhanced CRC protection, data retry on error detect and buffer registers for improved fault
isolation.
For increased availability, the HS21 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. One-half of total memory is available for use
with mirroring enabled. (Note: Due to the double writes to memory, performance is affected.)
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. In an HS21 with 16GB installed, up to 8GB
(using 4 single-rank 4GB DIMMs) or 12GB (using 4 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.) If a Memory and I/O Expansion
Unit is installed to upgrade an HS21 to 32GB of RAM, up to 24GB (using 8 single-rank 4GB
DIMMs) or 28GB (using 8 dual-rank 4GB DIMMs) of memory is available when the hot-spare
feature is active.
Either of these features requires operating system support.
PC2-5300 fully buffered memory is available in 1GB, 2GB, 4GB and 8GB memory kits (two
512MB, 1GB, 2GB or 4GB DIMMs per kit, respectively). DIMMs are installed in pairs for
increased performance, provided by dual-interleaving.
Gigabit Ethernet Controllers
The HS21 includes two integrated Broadcom BCM5708S Gigabit Ethernet controllers for up to
10X higher maximum throughput than a 10/100 Ethernet controller. The controllers offer TOE
(TCP Offload Engine) support, as well as failover and load balancing for better throughput and
system availability. It also supports highly secure remote power management using IPMI 2.0,
plus Wake on LAN
®
and PXE (Preboot Execution Environment) Flash interface.
For additional Gigabit Ethernet controllers, an optional Memory and I/O Expansion Unit may
be added. This provides two Broadcom BCM5714S controllers (no TOE support). An optional
2-port Ethernet expansion card adds two additional Gigabit Ethernet ports per HS21 server.
Large HDD Storage Capacity
The HS21 offers a choice of disk storage, supporting up to two 2.5-inch internal fixed SAS
drives, as well as an expansion unit that offers additional direct-attached storage.
• 10K RPM 2.5-inch — 36.4 or 73.4GB capacities (146.8GB maximum)
If this is not enough internal storage, an optional “sidecar” storage blade is available. The
Storage and I/O Expansion Unit is a 30mm blade that supports up to three 2.5-inch hot-swap
SAS HDDs. It is installed in the slot adjacent to an HS21 blade server.
Fully populating both the HS21 blade and the expansion unit provides up to 367GB of local
storage to the HS21 blade server. This storage can be configured as a single RAID-1 or RAID-5
array, or as two separate RAID arrays—one in the expansion unit and the other in the base
blade—for even more flexibility. If you need more storage space, terabyte capacities are
possible with optional external iSCSI and SAN storage solutions.
External Tape Storage
The HS21 supports various external rack-mounted SAN-attached tape drives. Supported tape
technologies include:
• IBM 2U Universal Tape Autoloader
• IBM 4U Universal Tape Library