Lenovo HS22 Betriebsanweisung PDF herunterladen (Seite 10)

Versatile, easy-to-use blade optimized for performance, energy and cooling

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10.

2.5-inch SAS HDDs

• 10K RPM — 73.4, 146.8, 300, 500, or 600GB capacities (1.2TB maximum)

• 15K RPM — 73.4 or 146.8GB capacity (293.6GB)

2.5-inch SATA HDDs

• SATA 10K RPM 2.5-inch HDD — 300GB capacities (600GB)

2.5-inch SSDs

• SATA-based —50GB (single) capacities (100GB maximum)

Due to the statistically higher failure rates for traditional spinning media, IBM recommends the

use of the solid state drives (SSDs) as an alternative. They store data on flash memory chips,

rather than on magnetic media. Like HDDs, SSDs can be used as boot media and for random

access storage. However, SSDs offer higher thresholds of shock and vibration, and a higher

operating temperature range (between 0 and 70 degrees C). This yields a failure rate only 1/3

that of HDDs (approximately 3,000,000 hours MTBF vs. 1,000,000 hours). In addition, the 2.5-

inch SSDs require only 2W. This reduces the storage power requirement and heat output by as

much as 80%, compared to 2.5-inch HDDs. If used as a boot device, no special device drivers

are required.

High IOPS SSD PCIe Adapters

o IBM 160GB High IOPS SS Class SSD PCIe Adapter (x4 Gen 1—100K IOPS, 750MBps)

o IBM 320GB High IOPS SS Class SSD PCIe Adapter (x4 Gen 1—100K IOPS, 750MBps)

o IBM 320GB High IOPS MS Class SSD PCIe Adapter (x4 Gen 1—100K IOPS, 750MBps)

o IBM 320GB High IOPS SD Class SSD PCIe Adapter (x8 Gen 2—200K IOPS, 1.5GBps)

o IBM 640GB High IOPS MLC Duo Adapter (x8 Gen 2—200K IOPS, 1.5GBps)

For read-intensive transactional workloads requiring extreme IOPS performance, such as

database, video-on-demand, and caching, IBM offers High IOPS SSD PCIe Adapters,

equivalent to the IOPS output of approximately 500

3.5-inch 600GB 15K SAS HDDs, with 99%

lower latency (30 µs), and 7.7x the bandwidth of a HDD. On a performance-per-watt basis,

these adapters outperform HDDs by up to 445x

Because these adapters go in PCIe slots, rather than drive bays, they can be used in addition to

standard HDDs and SSDs. This makes them ideal for virtualized servers running multiple tasks,

requiring both write- and read-intensive storage media. As flash media they also offer a

predictable lifetime, compared to the sporadic failure rate of HDDs, using N+1 chip-level

redundancy and 11-bit ECC protection.

Note: The High IOPS Adapters require a BPE4 expansion unit.

Additional storage is available via the BladeCenter S chassis.

If you need more storage space, terabyte capacities are possible with optional external iSCSI and

SAN storage solutions.

External Tape Storage

The HS22 supports various external rack-mounted SAN-attached tape drives. Supported tape

technologies include:

• IBM LTO3 2U Autoloader

• IBM LTO3 4U Tape Library

• IBM System Storage TS2230 Express Tape Drive

• IBM System Storage TS2240 Tape Drive Model H4S

• IBM System Storage TS3100 or TS3200 Tape Library

• IBM System Storage TS3310 Modular Tape Library

Light Path Diagnostics

Light path diagnostics enables a technician to quickly identify and locate a failed or failing system

component, such as a specific blower module or memory DIMM. This enables quick replacement

of the component, which helps increase server uptime and lower servicing costs.

The front of each blade server—and the chassis itself—has an LED indicator light to show

According to internal IBM testing, the typical maximum IOPS of a 600GB 15K 3.5-inch hot-swap SAS HDD is ~400 (4K random reads),

while the typical IOPS of a 640GB High IOPS SSD PCIe adapter is ~200,000, or ~500x. The typical bandwidth of the same HDD =

~195MBps (64K sequential reads), while the typical bandwidth of a 640GB High IOPS MLC adapter is ~1.5GBps, or ~7.7x.

97,014 IOPS / 9W = 10,779 IOPS per watt (160GB/320GB adapters). 196,000 IOPS / 12W = ~16,333 IOPS per watt (640GB adapters). 400

IOPS / 16.5W = ~24 IOPS per watt (600GB 15K 3.5-inch hot-swap SAS HDD).

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