Seagate ST373207LC Economies of Capacity and Speed: Choosing the most cost-eff
Seagate ST373207LC - Cheetah 73 GB Hard Drive Manual
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- Seagate ST373207LC | Economies of Capacity and Speed: Choosing the most cost-eff - Page 1
are 36GB 10K (lowest price box cost), as opposed to 146GB 15K (highest initial acquisition price/GB) or 300GB 10K (lowest price per GB). Were cost/capacity truly the dominant purchase criterion used by IT departments, they would instead be buying 300GB 10K drives (see Figure 1). 350 Capacity - Seagate ST373207LC | Economies of Capacity and Speed: Choosing the most cost-eff - Page 2
to simultaneously access the data, increasing the overall performance of the drives. COMPARISONS BETWEEN 10K-RPM AND 15K-RPM DISC DRIVES Server and storage performance significantly increases with 15K-RPM drives. For a typical workload, 15K drives deliver 32% more IOPS and 24% greater response time - Seagate ST373207LC | Economies of Capacity and Speed: Choosing the most cost-eff - Page 3
throughout each year of service operation. In servers that allow for a single drive or only a handful of drives, lower IOPS/GB drive performance cannot be augmented by using a larger number of drives to simultaneously access data. In such environments 15K drives offer significant risk mitigation - Seagate ST373207LC | Economies of Capacity and Speed: Choosing the most cost-eff - Page 4
. 15K-RPM disc drives were specifically designed to address the performance deficiencies of 10K drives, Purchasing 15K-RPM drives up front minimizes the need to buy a whole new system later, as 15K disc drives 15K-RPM disc drives. Fewer drives benefit the customer by enabling: • Less supporting - Seagate ST373207LC | Economies of Capacity and Speed: Choosing the most cost-eff - Page 5
mail in its workloads, verifies the cost efficiency of 15K-RPM disc drives. All top SPC price/performance leaders elected to use 15K drives. (see Figure 8) Storage Subsystem Disc Drive IBM Total Storage® FAStT 600 with Turbo Option (non-mirrored) HP StorageWorks (non-mirrored) EVA ZC12D STK-D280 - Seagate ST373207LC | Economies of Capacity and Speed: Choosing the most cost-eff - Page 6
each drive. This actuator carries multiple heads in order to provide a separate head to read and write data on each side of each disc used in the drive. However to make one complete revolution is 4.0 msec for a 15K drive (vs. 6.0 msec for a 10K drive). When a seeking head reaches the target track, - Seagate ST373207LC | Economies of Capacity and Speed: Choosing the most cost-eff - Page 7
the capacity on the disc. Thus fewer 15K-RPM disc drives of a given capacity are needed to meet the performance requirements of the system. Figure A3. AMERICAS ASIA/PACIFIC EUROPE, MIDDLE EAST AND AFRICA Seagate Technology LLC 920 Disc Drive, Scotts Valley, California 95066, United States, 831
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Economies of Capacity and Speed:
Choosing the most cost-effective disc drive
size and RPM to meet IT requirements
Introduction
IT departments are under growing pressure to find the most cost-effective means to meet their escalating data storage
requirements, including disc drive capacity and performance. Today’s storage systems must hold ever-increasing amounts of data,
achieve input/output (I/O) performance goals, meet client response-time expectations and minimize physical space (U or ft3)
requirements. Furthermore, IT professionals must ensure their storage systems are reliable-maximizing system availability while
minimizing drive failures, the number of RAID rebuilds and RAID rebuild time. All of these factors can come into play when
determining the optimal capacity and speed of a system’s disc drives.
In this paper we will discuss a variety of factors that impact the choice of disc drive capacity and speed for systems that offer a
choice between 3.5-inch 10K-RPM drives and 3.5-inch 15K-RPM drives. Let us start by looking at the current trend in drive
purchase decisions.
While IT departments often speak of buying drives on the basis of cost/capacity (price per GB), the majority of
drives they will actually purchase are 36GB 10K (lowest price box cost), as opposed to 146GB 15K (highest initial acquisition
price/GB) or 300GB 10K (lowest price per GB). Were cost/capacity truly the dominant purchase criterion used by IT departments,
they would instead be buying 300GB 10K drives (see Figure 1).
Why have IT departments preferred 10K 36GB drives? The history of disc drives and other system component offerings will shed
some light on this.
TP-525 • From: Seagate Global Product Marketing • May 2004
Technology Paper
Figure 1. IT departments are not buying the lowest cost/GB drives.
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