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Method and Procedure for arranging and populating HDDs in a multi-drive tray configuration to maximize HDD reliability and longevity by reducing exposure to thermal preheating conditions.

IP.com Disclosure Number: IPCOM000128896D
Original Publication Date: 2005-Sep-20
Included in the Prior Art Database: 2005-Sep-20
Document File: 2 page(s) / 748K

Publishing Venue

IBM

Abstract

In a Multi Drive Tray storage system a method and procedure is defined for how initial HDD configurations are populated (with HDDs) as well as an optimum sequence for growing the configuration. Most disk drive storage configurations include spare HDDs, as opposed to "operational" HDDs. The initial configuration should populate the operational HDDs in the positions within the MDTs that have the least preheated air. As the configuration grows, HDDs should be populated in available positions across the multiple MDTs with the lowest preheated air, leaving the "hot spots" to be populated last. Any spares that are used should be populated in the positions at the end of the air flow.

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Method and Procedure for arranging and populating HDDs in a multi -drive tray configuration to maximize HDD reliability and longevity by reducing exposure to thermal preheating conditions.

In JBOD and SBOD storage systems, generally, HDDs (hard disk drives) are packaged one deep in a disk drive enclosure and air flow is directed from front to back or back to front of the HDD to cool it. This is the case for 3.5" HDDs, see Figure 1. As SFF 2.5" HDDs become available it no longer is efficient to package the HDD only one deep and resulting packaging solutions will result in the need for a multi drive tray (MDT), that is, two or more SFF HDDs physically in series with each other, see Figure 2. Since airflow will continue to be directed front to back or back to front across the MDT, there will be preheating of the air from the first HDD in the stream, whereby the last HDD in the stream will operate under the hottest conditions. It is known that HDD reliability is directly related to operating temperature (higher temperature = lower reliability). A method is needed to address this MDT situation and enhance HDD longevity.

Referring to Figure 1, rather than a single HDD per "slot", a Multi Drive Tray (MDT) is installed in each slot (0-15), each tray with three HDD positions. The first sixteen HDDs should be populated, one each in position 2 (refer to Figure 2, the coolest location) on each MDT. The next sixteen HDDs would be populated in position 1 (the next to coolest location) on each MDT. The last sixteen HDDs should be populated in position 0 (the least coolest location) on each MDT. Any spare HDDs...