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A method to prevent external air flow from disrupting cooling system of storage system

IP.com Disclosure Number: IPCOM000237593D
Publication Date: 2014-Jun-26
Document File: 6 page(s) / 269K

Publishing Venue

The IP.com Prior Art Database

Abstract

This artical describes a method to prevent external air flow from disrupting cooling system of storage device. Our solution is to add an automatic slot damper at the mouth of a storage enclosure slot which is just like a door of the slot. When pull a disk out of a slot, it can automatically bounce to cover the mouth of the slot just like an automatical door. Through this method, the whole storage system can stay closed and the cooling system will not be disrupted.

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Page 01 of 6

A method to prevent external air flow from disrupting cooling system of storage system


1. Background

A typical storage system is made up of power system, cooling system, storage enclosures and IO enclosures. Take

a typical high-end storage system

as an example,

the structure of a

base

              frame is shown as Fig 1. Cooling fans are located on the top of the frame. Then comes several storage enclosures and then other components. The whole frame is a closed system. The system needs to stay at a reasonable temperature when running. Otherwise it will lead to system performance reduction even system corruption. So the cooling system is very important.

cooling fans

storage enclosure

storage enlosures

storage enclosure

other components

Fig. 1

Every storage system

at least contains a base frame. It also can contain

several

expansion frames. We can install

several

storage enclosures in base frame,

and

there are quite a

lot of

disks in a

storage system

. These disks will generate large quantities of heat while running.

normally more

storage enclosures in the expansion frame

s

. Each disk enclosure contains

dozens of

DDMs

(Disk Drive Modules)

or dummy carriers(shows in Fig. 2). So

1



Page 02 of 6

A typical storage enclosure

Slot 1

Slot 2

Slot 3

Slot 4

Slot 5

Slot 6

Slot 7

Slot 8

Slot 9 Slot 10

Slot 11

Slot 12

Slot 13

Slot 14 Slot 15 Slot 16 Slot 17 Slot 18 Slot 19 Slot 20

Slot 21

Slot 22 Slot 23 Slot 24

Fig. 2

Fig.3 shows the air flow of the frame which is from the bottom to the top. Cool air is drawn from the bottom and rises up to cooling the disks. Then the air becomes hot and exhausts from the top cooling fans of the frame.

cooling fans

storage enclosure

storage enclosure

storage enclosure

air flow

storage enclosure

2



Page 03 of 6

Fig. 3

If a DDM is not present, its slot must be occupied by a dummy carrier. Without a drive or a dummy carrier, cooling air does not circulate properly. Fig. 4 shows the situation when a storage enclosure slot is empty. The external air flow will disturb the air circulation inside of the frame and it will lead to the temperature rises up. So if

on site

support engineer

            s forget to insert a dummy carrier when remove disk or can't find any dummy carriers, it will disturb the system cooling. In severe case, it will lead to high temperature and even the system corruption. In fact, we have already got the cases that the empty enclosure results in temperature rises up and system corruption when replace some enclosures.

external air flow

empty slot without a disk or a dummy carrier

Fig. 4

cooling fans

storage enclosure

storage enclosure

storage enclosure

air flow

storage enclosure


2. Summary of Invention

Our solution is to add an automatic slot damper at the mouth o...