JP2004139724A - Disk array device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To uniformly cool a canister consisting of a HDA (Head Disk Assembly) and a control circuit substrate for the HDA in a disk array device. <P>SOLUTION: The disk array device is provided with a HDD BOX unit having a plurality of up-and-down and right-and-left HDD BOXes for supporting and fixing canisters 7 having the HDA and an electronic circuit substrate, and a plurality of fans for cooling the canisters with cooling air. The plurality of fans are arranged on a front surface door and a rear surface door to suck the cooling air from the front and rear surfaces, and also exhaust it through an upper cover provided with the fans; the HDD BOX units are arranged to form a gap space about in the middle part of the front surface door and the rear surface door; the air is exhausted from the upper surface cover through the gap space; and a cooling air separating member 21 for separating the cooling air, which cooled the HDD BOX units on the door side and those on the rear surface door in the opposite directions, is arranged in the gap space 17. <P>COPYRIGHT: (C)2004,JPO

Description

{Circle over (1)} The present invention relates to a disk array subsystem, and more particularly, to a device cooling technique suitable for the configuration, arrangement, high density, and high reliability of a plurality of magnetic disk device groups.

As described in JP-A-8-124375, a conventional apparatus includes a plurality of HDAs (Head @ Disk @ Assembly) in which one fan has m rows (m.gtoreq.2) in series and n columns (n.gtoreq.2) in parallel. ) And the control circuit board of the HDA were cooled, the flow rate of air for cooling each HDA and the control circuit board was equal due to the symmetry, and the same cooling effect was obtained. However, when the canister including a part of the HDA and the control circuit board of the HDA is not mounted for some reason, there are the following problems.

That is, as shown in FIG. 7, from the state in which the canister 7 including the HDA 5 for recording and reproducing information and the control circuit board 6 of the HDA is fully mounted, as shown in FIG. If the canister 7 at the position of the 5th row, 4th column, and 7th row, 4th column is extracted, a "flow expansion / reduction resistance" of the cooling air is newly generated at the extracted location. The road resistance is higher than in the first to third rows, and the flow velocity of the cooling air in the fourth row is lower than in the first to third rows.

Accordingly, the temperature rise of the HDA 5 located at 2 rows and 4 columns, 4 rows and 4 columns, 6 rows and 4 columns, and 8 rows and 4 columns is higher than when the canister 7 is fully mounted.

(4) The phenomena described above were measured by the following method. As shown in FIGS. 9 and 12, a flow meter 23 having a flow sensor at the tip of an elongated rod-like probe is provided in the gap between the canister 7 and the HDD (Hard Disk Drive) BOX 8 in the middle of the HDA 5 in the depth direction. FIG. 13 shows the result of measuring the flow velocity by inserting the probe into the position. However, since the flow rates in the second and fourth rows were almost equal, only the results in the second row are shown.

9, 10, and 11, the air flow velocity measurement point 22a on the left side of the HDA 5 and the air flow velocity measurement point 22b on the right side of the control circuit board 6 of the HDA were measured. Since the flow velocities were almost equal, only the result of measuring the air flow velocity measurement point 22a on the left side of the figure of the HDA 5 is shown.

From the graph of FIG. 13, it is assumed that when the air velocity in the portion other than the fourth row is 3.6 m / s, the air velocity in the fourth row is about 2.3 m / s, and the radiation coefficient is proportional to the air velocity. Then, the temperature rise in the fourth row is 1.5 times that of the other portions, and there is a problem that cooling is insufficient.

Further, the conventional apparatus mounts a large-diameter disk having a disk diameter of 5 inches or more and mounts a single row of HDAs in the depth direction of the apparatus as disclosed in Japanese Patent Application Laid-Open No. 7-37376. When a small-diameter disk having a diameter of 3.5 inches or less is mounted, it becomes necessary to mount HDAs in parallel on the front and rear surfaces of the device housing for high-density mounting. Japanese Patent Application Laid-Open No. 8-124375 is a cited example of the prior art, but in Japanese Patent Application Laid-Open No. 8-124375, the air flow warmed by the lower HDA and the control circuit board cools the upper HDA and the control circuit board. Therefore, it cannot be used for cooling a high heat generating element such as a magnetic disk device which rotates at a high speed of 10,000 RPM or more.

That is, the heat generated by the spindle is
(1) Disk loss consumed by viscous torque of air when the disk rotates,
(2) Arm loss consumed by the viscous torque of the air generated by inserting the arm on which the magnetic head is mounted into the air rotating with the disk (depending on the position of the magnetic head relative to the disk, the magnetic head is When it is located at the innermost circumference of
(3) bearing loss consumed by friction and viscous torque of a ball bearing or a fluid bearing supporting the spindle;
(4) Seal loss consumed by viscous torque of the magnetic fluid seal for preventing dust from flowing into the HDA;
(5) Copper loss consumed by Joule heat due to current flowing through the motor coil and electric resistance of the coil,
(6) When the stator of the motor is excited, iron loss consumed by Joule heat due to eddy current generated in the steel plate of the stator and electric resistance of the steel plate;
And is obtained by experiments, calculations, and the like.

According to the calculation by the inventors, the maximum heat generation of the spindle portion of the HDA mounting 15 3.5-inch disks is about 9 W at 6,300 RPM, and is cooled by the method disclosed in Japanese Patent Application Laid-Open No. 8-124375. Although it is possible, when the rotational speed reaches 10,000 RPM, the maximum heat generation of the spindle part is about 27 W, the temperature rise is about three times that at 6,300 RPM, and the temperature rise is equivalent to that at 6,300 RPM. In order to achieve this, the flow velocity around the HDA must be about 10 to 20 m / s, but there is a problem that it is impossible with the method disclosed in Japanese Patent Application Laid-Open No. 8-124375.

Japanese Patent Application Laid-Open No. Hei 7-122055 discloses a conventional example of using a rectifying member for the “rectifying member” in the claims of the present application. In order to eliminate the occurrence of Karman vortices, the cross-section of the rectifying member is made to be streamlined, and the second rectifying member proposed in the above-mentioned publication increases the air flow velocity in the reduced portion by reducing the flow. That is.

On the other hand, the rectifying member of the present invention reduces the flow path resistance due to expansion and contraction of the flow from the cooling air path, and differs from the usage, purpose, means, function, and effect of the rectifying member in the above-mentioned publication. is there.

The problem to be solved by the present invention is to mount an HDA on which a small-diameter disk of 3.5 inches or less is mounted at a high density, as described in JP-A-8-124375. In a disk subsystem in which a canister composed of an HDA and an HDA control circuit board is mounted in parallel on the rear surface, the HDA and the HDA control circuit can be used even when the spindle rotation speed of the HDA is high (10,000 RPM). The purpose is to reduce the temperature rise of the substrate and these components as well as at 6,300 RPM.

In order to solve the above problems, the present invention mainly employs the following configuration.
An HDD BOX for supporting and fixing at least one canister having an HDA and an electronic circuit board for recording and reproducing information, an HDD BOX unit having a plurality of HDD BOXes vertically and horizontally, and cooling the canister by cooling air In a disk array device including a plurality of fans,
A plurality of HDD BOX units are arranged vertically and horizontally, and a plurality of fans are arranged on a front door and a rear door of the disk array device to take in cooling air from the front and rear surfaces and exhaust air from a top cover on which the fans are arranged. Thus, the flow rate of the cooling air in each canister is set to a predetermined value,
In the plurality of HDD BOX units, a clearance space is formed at a substantially central portion between the front door and the rear door, and the space is exhausted from the upper cover through the clearance space, and the HDD BOX unit on the front door side and the HDD on the rear door side. A disk array device in which a cooling air separating member for separating cooling air in opposite directions after cooling a BOX unit is provided in the gap space.

According to the present invention, there is provided a disk array subsystem including a large number of HDAs mounting a small-diameter disk of 3.5 inches or less and a canister group including a control circuit board of the HDA and components related thereto. Even if the spindle rotation speed of the HDA is higher than the current condition and the generated heat is larger than that of the conventional model, the means for arranging a plurality of fans on the back of the door and the components such as the canister and the like are connected in series in one direction. Cooling means, a means for exhausting by providing a clearance space and a fan, and means for installing an air separating member in the clearance space, thereby improving the exhaustion efficiency and cooling efficiency, and controlling the HDA and HDA. The substrate temperature rise can be made equal to or less than the current level, and a large number of small-diameter magnetic disk drives of 3.5 inches or less are mounted, and It could provide a disk array system which enables degrees implemented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of the disk array subsystem according to the first embodiment of the present invention as viewed from the front of the device. In the disk array subsystem apparatus of the present invention, two identical HDD @ BOX units are provided with openings on the lower and upper surfaces of the HDD @ BOX storing the canister, and mounted with a fan so that the cooling air flows upward. Are mounted in pairs, and when the fan of one HDD @ BOX unit fails, the components of both HDD @ BOX units are cooled by the fan of the other HDD @ BOX unit to prevent an excessive rise in temperature.

Also, two sets of HDD @ BOX units are arranged at the front of the apparatus and another set is provided at the rear of the apparatus, and two sets of HDD @ BOX units are arranged above the two sets of HDD @ BOX units. A unit for disposing the lower two sets of HDD @ BOX unit cooling air pipe system and the upper two sets of HDD @ BOX unit cooling air pipe system is fixed to the apparatus. The upper two sets of eight HDD @ BOX units are the same product.

In the system of the present invention according to FIG. 1, a front door 1f having intake ports 1a and 1b and a rear door 1r are attached to the front and rear portions of the apparatus so as to be openable and closable, as shown in FIG. , Side covers 2a and 2b are attached, and a top cover 3 having an exhaust hole 3a is attached to the ceiling.

As shown in FIG. 12, the cooling of the components in this apparatus is performed by the outside air intake air, and the air is sucked from the intake ports 1a, 1b provided in the door 1 (1f, 1r). After the dust is removed by a filter (not shown) provided inside the device, the components inside the device are cooled and discharged from an exhaust hole 3a provided in the top cover 3.

FIG. 1 shows an arrangement relationship of an HDD BOX unit 4 mounted inside the apparatus, a power supply group, a buffer board group, and a fan group for cooling them. Specifically, the HDD BOX unit 4 includes an HDA 5 for recording and reproducing information and a canister 7 including an electronic circuit board 6 for controlling the HDA. Are removably mounted from the front of the HDD BOX 8, which is composed of brackets for supporting and fixing them. Also, one or more buffer boards 9 for transmitting information between the canister 7 and the host device are mounted. Further, several power supplies 11 for supplying power to the canister 7, the buffer board 9, and the fan 10 are mounted.
On the rear surface of the HDD BOX 8, a substrate (not shown) on which connectors for electrical connection between the respective components including the canister 7, the buffer substrate 9, the fan 10, and the power supply 11 are arranged is mounted. . The lower surface and the upper surface of the HDD BOX 8 are open, and a fan 10 for generating an upward flow for cooling the respective components of the canister 7, the buffer substrate 9, and the power supply 11 is mounted on the upper portion. . As described above, the lower surface and the upper surface of the HDD BOX unit 4 are partially open, and a forced air blowing structure such as the fan 10 is used to increase the cooling air through the opening to improve the cooling efficiency.

Further, the above-mentioned HDD @ BOX units 4 are, for example, HDD @ BOX units 4a and 4b mounted in pairs of upper and lower two units (a total of four units). In addition, the HDD @ BOX unit 4a (for example, one unit for one column and one row and two rows, and one column and one row and two rows), and 4b (for example, one column and three rows and two rows, and two columns and three rows) Similarly, as shown in FIG. 12, another set of the HDD @ BOX units 4c and 4d is disposed between the back of the HDD @ BOX units 4a and 4b by about 50 to 150 mm as shown in FIG. A gap 17 is provided for mounting.

Furthermore, on top of the above-mentioned two sets of HDD @ BOX units 4a, 4b and 4c, 4d, another two sets of HDD @ BOX units 4e (e.g., 1 column 5 rows and 6 rows, and 2 columns 5 rows and 6 rows, 1 unit), 4f (for example, 1 column 7 rows and 8 rows, and 2 columns 7 rows and 8 rows, 1 unit) and 4g, 4h.

On the other hand, as shown in FIG. 12, air plates 24a, 24b, 24c, and 24d are attached to the lower part of each set of the HDD box unit 4 as a device fixing member. These components are shown in a simplified manner.

In the above cited example of the conventional example, the HDA 5 is arranged in a fully mounted state, that is, in a state as shown in FIG. When the canister 7 composed of the substrate 6 is not mounted for some reason (for example, a customer does not want to use an option disk), the rectifying member 13 formed of a box-shaped structural member having the same shape and dimensions as the outer shape of the canister 7. Is installed in a portion where the canister 7 is not mounted, or by attaching a plate-shaped rectifying member 12 substantially along the flow direction of the cooling air as shown in FIG. ing. Thereby, the flow velocity of the air for cooling the canisters 7 composed of the HDA 5 in the fourth row and the control circuit board 6 of the HDA 5 becomes equal to the flow velocity of the air for cooling the canisters 7 in the first to third rows.

FIG. 9 is a partial sectional view of the conventional disk array subsystem when viewed from the front. FIGS. 10 and 11 are partial sectional views of the disk array subsystem according to the first embodiment of the present invention as viewed from the front. FIG. 12 is a partial sectional view of the disk array subsystem shown in FIGS. 9, 10 and 11 as viewed from the side.

First, in order to confirm the effect of the present invention, in the case of the conventional example as shown in FIG. 9 and in the case of FIGS. 10 and 11 of the present invention, the HDA 5 and the electronic circuit board 6 for actually controlling the HDA 5 are provided. The cooling air flow rate around the canister 7 was measured. That is, as shown in FIGS. 9 to 11, the cooling air flow velocity at the HDA 5 in each of the second and fourth rows and the air velocity measurement point 22 near the control circuit board 6 of the HDA was measured.

As shown in FIG. 12, the result of inserting a flow meter 23 having a flow rate sensor at the tip of an elongated rod-shaped probe in the gap between the canister 7 and the HDD BOX 8 to the middle position in the depth direction of the HDA 5 and measuring the flow rate Is shown in FIG. However, since the flow rates in the second and fourth rows were almost equal, only the results in the second row are shown.

9, 10, and 11, the air flow velocity measurement point 22 a in the gap between the left side of the HDA 5 and the HDD BOX 8 and the gap between the right side of the control circuit board 6 in the HDA 5 and the right side of the HDD BOX 8. Was measured at the air flow velocity measurement point 22b, but the flow velocity at both positions was not equal. Therefore, only the measurement result at the air flow velocity measurement point 22a in the gap between the left side of the HDA 5 and the HDD BOX 8 is shown.

From the graph of FIG. 13, in the case of the conventional example shown in FIG. 9, when the flow velocity in the portion other than the fourth row is 3.6 m / s, the flow velocity in the fourth row is about 2.3 m / s. It can be seen that the cooling air flow rates in the rows are lower than in the first to third rows. Further, in the state of the embodiment of the present invention as shown in FIGS. 10 to 11, the flow velocity is 3.6 m / s from the first row to the fourth row, and it is understood that the flow velocity is constant regardless of the row. .

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a sectional view of a disk array subsystem according to a second embodiment of the present invention as viewed from the front. The disk array subsystem device of this embodiment has a configuration in which openings are provided on the front and back surfaces of the BOX unit, and a fan is mounted so that cooling air flows in parallel in a serial direction. Further, one set of such a BOX unit group is arranged at the front of the apparatus, and another set is arranged at the rear of the apparatus, and members constituting a cooling air pipe system are fixed to the apparatus. .

In the system of the present invention according to FIG. 2, a front door 1g having intake ports 1a and 1b and a rear door 1s are attached to the front and rear portions of the apparatus so as to be openable and closable, as shown in FIG. , Side covers 2a and 2b are attached, and a top cover 3 having an exhaust hole 3a is attached to the ceiling.

As shown in FIG. 3, the cooling of the components inside the apparatus is performed by the outside air intake air, and the air is sucked from the intake ports 1a, 1b provided in the door 1 (1g, 1s). After the dust is removed by a filter (not shown) provided inside the device, the components inside the device are cooled and discharged from an exhaust hole 3a provided in the top cover 3. FIG. 2 shows an arrangement relationship among a group of BOX units, a group of power supplies, a group of buffer boards, and a group of fans for cooling these mounted inside the apparatus.

More specifically, the BOX unit 14 includes a bracket for supporting and fixing a canister 7 including an HDA 5 for recording and reproducing information and an electronic circuit board 6 for controlling the HDA 5, and is attached to and detached from the front of the BOX. It is freely implemented. Also, one or more buffer boards 9 for transmitting information between the canister 7 and the host device are mounted.

Further, several power supplies 11 for supplying power to the canister 7, the buffer board 9, and the fans 15 and 16 are mounted. On the rear surface of the BOX unit 14, a board (not shown) on which connectors for electrical connection between the respective components including the canister 7, the buffer board 9, the fans 15, 16 and the power supply 11 are arranged. Implemented.

The front and rear surfaces of the BOX unit 14 are open, and generate a parallel flow for cooling the respective components of the canister 7, the buffer substrate 9, and the power supply 11 in the front door 1g and the rear door 1s. A fan 15 and a fan 16 are mounted. As described above, the front and rear surfaces of the BOX unit 14 are open, and a forced air blowing structure such as the fans 15 and 16 is used to improve the cooling efficiency through the openings so that the cooling air flows in parallel. These components are also shown in a simplified manner.

Further, in FIG. 2, one canister 7 is cooled per one fan 15, but one fan 15 may cool a plurality of (two or four) canisters. FIG. 3 is a sectional view of the disk array subsystem of FIG. 2 as viewed from the side. As described above, the fans 15 and 16 for cooling the canister 7 are configured to be attached to the back surfaces of a pair of front and rear doors 1 (1g, 1s). Further, on the rear surface (rear door side) of the device, the components having the same configuration as the front surface (front door side) of the device are symmetrically arranged, and a distance of 50 to 200 mm is provided between the components on the front surface and the rear portion. The gap space 17 is provided.

Although not shown, the door 1 (1g, 1s) has an air inlet, and the air that has cooled the canister 7 composed of the HDA 5 and the control circuit board 6 of the HDA 5 by the fans 15 and 16 is supplied to the gap space 17. Exhausted. However, the control circuit board 6 is not shown in FIG. 3, and only the HDA 5 is shown. In order to efficiently exhaust the air exhausted into the gap space 17 upward, a fan 18 is mounted in the gap space 17 and a fan 18 is mounted on the top cover 3 above the gap space 17. Thereby, the flow path of the cooling air becomes like the cooling air path 19, so that an efficient air flow velocity can be obtained.

FIG. 4 is a sectional view of the disk array subsystem of FIG. 2 as viewed from above. An exhaust flow 20a that cools the canister 7 on the front side of the apparatus and an exhaust flow 20b that cools the canister 7 on the rear side of the apparatus blow toward the gap space 17 from opposite directions. By providing the air separating member 21 for separating the exhaust streams 20a and 20b, the turbulence of the air due to the collision between the exhaust stream 20a and the exhaust stream 20b is eliminated, and the exhaust stream 20a and the exhaust stream 20b are separated by the gap space. 17 efficiently exhausts.

FIG. 5 is a sectional view of the disk array subsystem of FIG. 2 as viewed from above. The air separation member 21 described in FIG. 4 may be installed as shown in FIG. The air separation member 21 shown here is a planar air separation member 21a.

FIG. 6 is a sectional view of the disk array subsystem of FIG. 2 as viewed from above. Although the air separating member 21 described with reference to FIG. 4 is a flat air separating member 21a, the air separating member 21b having a curved surface as shown in FIG. 6 has higher exhaust efficiency.

Therefore, in order to mount an HDA on which a small-diameter disk of 3.5 inches or less is mounted at a high density, a disk sub-mounting a canister including a plurality of HDAs and a control circuit board of the HDA in parallel on the front and rear surfaces of the device housing. In the system, even if the spindle rotation speed of the HDA is higher than the current speed, a plurality of fans are arranged on the back of the door, and one fan creates a parallel flow in the serial direction, from one HDA and the control circuit board of the HDA. The canister is cooled, and a space having a gap of about 50 to 200 mm is provided between the front face of the apparatus housing and the rear face of the rear canister, and the air that has cooled the canister is exhausted into the gap space.

Further, by installing the air separating member in the gap space, the canister on the front side of the apparatus and the canister on the rear side of the apparatus are cooled. Exhaust efficiency and cooling efficiency are improved, and the temperature rise of the control circuit boards of HDA and HDA can be made equal to or less than the current level.

As described above, the present invention includes the following configuration examples.

In a disk array subsystem in which one fan cools a plurality of canisters composed of an HDA and an HDA control circuit board in m rows (m ≧ 2) in series and n columns (n ≧ 2) in parallel, However, even if some of the canisters are not mounted for some reason where all (m × n) pieces should be mounted, by using the following rectifying members, the canisters not mounted in the cooling air path can be Means are provided for preventing the cooling air flow rate around the downstream canister from decreasing.

(1) Means that uses a flat rectifying member and does not change the cooling air flow path.

(2) Instead of a canister consisting of an HDA and an HDA control circuit board that is not mounted, a box-shaped rectifying member made of a structural member having substantially the same shape and size as the outer shape of the canister is installed, and a flow path resistance of a cooling air path is provided. Means that do not change.

Further, the present invention provides a canister comprising a plurality of HDAs and a control circuit board for the HDA in parallel on the front and rear surfaces of the device housing in order to mount an HDA having a small diameter disk of 3.5 inches or less at a high density. In the disk subsystem to be mounted, a plurality of fans are arranged on the back of the door, and one fan cools a canister composed of one HDA and the control circuit board of the HDA in series, and a fan is arranged between the front and rear canisters. A space having a gap of about 50 to 200 mm is installed, the air that has cooled the canister is exhausted into the gap space, and the front and rear canisters are cooled, and the wind blowing from opposite directions collides. Means are provided for installing an air separating member in the gap space so that turbulence does not occur and exhaust efficiency and cooling efficiency do not deteriorate.

Also, in the disk subsystem provided with the clearance space, if a canister is not mounted, it is natural that the cooling effect may be obtained by mounting the rectifying member at that location.

FIG. 2 is a sectional view of the disk array subsystem according to the first embodiment of the present invention as viewed from the front. FIG. 7 is a sectional view of a disk array subsystem according to a second embodiment of the present invention as viewed from the front. FIG. 3 is a sectional view of the disk array subsystem of FIG. 2 as viewed from a side. FIG. 3 is a sectional view of the disk array subsystem of FIG. 2 as viewed from above. FIG. 3 is a cross-sectional view of the disk array subsystem of FIG. 2 as viewed from above, and illustrates the application of a planar air separating member as an air separating member. FIG. 3 is a cross-sectional view of the disk array subsystem of FIG. 2 as viewed from above, and is a diagram illustrating application of a curved air separating member as an air separating member. FIG. 7 is a cross-sectional view of a conventional disk array subsystem viewed from the front, illustrating the flow of air flow when all the canisters are mounted. FIG. 10 is a cross-sectional view of a conventional disk array subsystem viewed from the front, illustrating a flow of an air flow rate when a canister is not partially mounted. FIG. 7 is a diagram for explaining an air flow velocity measurement point and the like in a partial sectional view of a conventional disk array subsystem viewed from the front. FIG. 2 is a partial cross-sectional view of the disk array subsystem according to the first embodiment of the present invention as viewed from the front. FIG. 2 is a partial cross-sectional view of the disk array subsystem according to the first embodiment of the present invention as viewed from the front. FIG. 12 is a partial cross-sectional view of the disk array subsystem of FIGS. 9, 10, and 11 as viewed from the side. FIG. 12 is a graph of the cooling air flow rate of the fourth row of canisters of the disk array subsystem of FIGS. 9, 10 and 11;

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 door 1f Front door of 1st embodiment 1r Rear door of 1st embodiment 1a Inlet of front part of device of 1st embodiment 1b Inlet of rear part of device of 1st embodiment 1g Front door of 2nd embodiment 1s No. Rear door 2 of the embodiment 2 Side cover 2a Device left side cover 2b Device right side cover 3 Top cover 3a Top cover exhaust port 4 HDD BOX unit 4a Lower HDD BOX unit 4b at lower part of front lower part of device front lower part of device front The upper HDD BOX unit 4e of the upper set in the upper set of the lower HDD BOX unit 4f The upper HDD BOX unit 4c of the upper set in the upper front of the apparatus The lower HDD BOX unit 4d of the lower set on the rear side of the apparatus Upper HDD BOX unit in the lower set on the back of the device 4g Below the upper set on the back of the device HDD Box Unit 4h Upper HDD Box Unit 5 HDA in the upper set on the rear side of the device
6 Electronic circuit board for controlling HDA 7 Canister 8 HDD BOX
Reference Signs List 9 buffer board 10 fan 10a fan for cooling canister 10b fan for cooling power supply 11 power supply 12 plate-shaped rectifying member 13 box-shaped rectifying member made of a structural member having the same shape and dimensions as the outer shape of canister 14 BOX unit 15, 16 Fan for canister 17 Gap space 18 Fan for gap space 19 Cooling air path 20 Exhaust air flow 20a Cooled exhaust air flow on front side of device 20b Cooled exhaust air flow on rear side of device 21 Air separation member 21a Flat air Separation member 21b Curved air separation member 22 Air flow rate measurement point 22a Air flow rate measurement point in gap between left side of HDA and BOX 22b Air flow rate measurement point in gap between right side of control circuit board and BOX 23 Current meters 24a, 24b , 24c, 24d Air plate

Claims (3)

An HDD BOX for supporting and fixing at least one canister having an HDA and an electronic circuit board for recording and reproducing information, an HDD BOX unit having a plurality of HDD BOXes vertically and horizontally, and cooling the canister by cooling air In a disk array device including a plurality of fans,
A plurality of HDD BOX units are arranged vertically and horizontally, and a plurality of fans are arranged on a front door and a rear door of the disk array device to take in cooling air from the front and rear surfaces and exhaust air from a top cover on which the fans are arranged. Thus, the flow rate of the cooling air in each canister is set to a predetermined value,
In the plurality of HDD BOX units, a clearance space is formed at a substantially central portion between the front door and the rear door, and the space is exhausted from the upper cover through the clearance space, and the HDD BOX unit on the front door side and the HDD on the rear door side. A disk array device, wherein a cooling air separating member for separating cooling air in opposite directions after cooling a BOX unit is provided in the gap space. The disk array device according to claim 1,
The disk array device according to claim 1, wherein the cooling air separating member has a flat shape or a curved shape. The disk array device according to claim 1 or 2,
When exhausting the cooling air from the top cover through the gap, a plurality of fans are installed in the gap.

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