CN104077424A - Method and device for realizing online hot switch of hard disks - Google Patents
Method and device for realizing online hot switch of hard disks Download PDFInfo
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- CN104077424A CN104077424A CN201410355960.XA CN201410355960A CN104077424A CN 104077424 A CN104077424 A CN 104077424A CN 201410355960 A CN201410355960 A CN 201410355960A CN 104077424 A CN104077424 A CN 104077424A
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/1608—Error detection by comparing the output signals of redundant hardware
- G06F11/1612—Error detection by comparing the output signals of redundant hardware where the redundant component is persistent storage
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Abstract
The invention discloses a device for realizing the online hot switch of hard disks. The device is applied to a first server node and a second server node, wherein the first server node comprises a first controller and hard disks; the second server node comprises a second controller and hard disks. The device comprises a plurality of chips, wherein the quantity of the chips corresponds to that of the hard disks in the two server nodes; one end of each chip is connected with each hard disk in a one-one correspondence manner, and the other end of each chip is respectively connected with the first controller and the second controller; the chips are used for selecting the different controllers to manage the hard disks connected with the chips according to two control signals from the first controller and the second controller. The invention further discloses a method for realizing the online hot switch of hard disks through the device. Through the adoption of the method and the device, the situation that hard disks cannot be accessed due to the failure of the controllers can be avoided.
Description
Technical field
The present invention relates to technical field of data storage, particularly a kind of method and device of realizing the online hot-swap of hard disk.
Background technology
The rise of cloud computing, facilitates the deployment of server more and more concentrated.And the existing explosive growth feature of internet, applications, and reduce IT and drop into excessively rapid growth requirement, the Internet enterprises in the whole world, has proposed customization requirement to the product form of server and structure one after another, so the rise of high density multi node server becomes inexorable trend.See that at present the existing design of the multi node server for complete machine cabinet also has the multi node server design for specific dimensions cabinet.By whole Intensive Design, can effectively reduce total input cost (TCO, Total Cost of Ownership), simplify operation management, adapt to and reduce IT unit cost, meet the needs of traffic growth simultaneously.
On the other hand, the growth of Internet service has accumulated a large amount of data.And hard-disk capacity is nowadays also increasing, ata bus (SATA connected in series, Serial ATA) hard disk generally reaches the single-deck capacity that is greater than 1TB, and Serial Attached SCSI (SAS) bus (SAS, Serial Attached SCSI) hard disk also has the single-deck capacity of hundreds of GB.Although eliminate Single Point of Faliure in Software Architecture Design, and utilize multicopy to reduce the impact of loss of data as far as possible, aol server still proposes huge challenge to service quality and operation management because of the service disconnection that hardware fault causes.
Common server, is generally connected with some big capacity hard disks, between each server node, cannot realize share and access.Fig. 1 is the structural representation of 2 node servers.Have 2 nodes, each node can be considered as an independently server.Each node comprises central processing unit (CPU), controller and hard disk.One end of controller connects CPU, and the other end connects a plurality of hard disks.Each node only can be accessed local hard drive, does not possess the ability of other node hard disks of direct access.
As seen from Figure 1, all hard disks are all that single-point connects, once hardware fault appears in server node, the data in this server node hard disk cannot be accessed.At this moment, usually need line O&M personnel's hand inspection a tracing trouble, and then find out solution.
Although current enterprise-level hard disk reliability is very high, once but controller end or other host side break down, will cause the hard disk of its connection cannot be by other node visits, even if change and also can introduce extra downtime immediately, cause service disruption, strengthen O&M work difficulty.
Summary of the invention
The object of the present invention is to provide a kind of method and device of realizing the online hot-swap of hard disk, can avoid causing hard disk to access because of the fault of controller.
For achieving the above object, the invention provides a kind of device of realizing the online hot-swap of hard disk, this application of installation is in the first and second server nodes, and wherein, first server node comprises the first controller and hard disk; Second server node comprises second controller and hard disk; This device comprises:
A plurality of chips, the quantity of described chip is corresponding with the quantity of hard disk in two server nodes, and each chip one end and each hard disk connect one to one, and the other end connects respectively the first controller and second controller; The hard disk that each chip selects different controller managements self to be connected for basis from the two path control signal of the first controller and second controller.
For achieving the above object, the present invention also provides a kind of method that described device is realized the online hot-swap of hard disk of applying, and the method comprises:
The control signal that the chip being connected when the hard disk with second server node receives from the first controller is high level, while being low level from the control signal of second controller, the hard disk in second server node is switched to the first controller management;
The control signal that the chip being connected when the hard disk with first server node receives from the first controller is low level, while being high level from the control signal of second controller, the hard disk in first server node is switched to second controller and is managed.
In sum, the device of the online hot-swap of hard disk that the embodiment of the present invention provides, this application of installation is in the first and second server nodes, and wherein, first server node comprises the first controller and hard disk; Second server node comprises second controller and hard disk; This device comprises: a plurality of chips, and the quantity of described chip is corresponding with the quantity of hard disk in two server nodes, and each chip one end and each hard disk connect one to one, and the other end connects respectively the first controller and second controller; The hard disk that each chip selects different controller managements self to be connected for basis from the two path control signal of the first controller and second controller.Like this, between controller and hard disk, increased dexterously the online hot-swap device of hard disk, once there be the controller failure of a server node, the controller of another node just can be taken over the hard disk in out of order server node, thereby realized local hard drive by other server node hot joining pipe and access, greatly increase the availability of data, improved O&M efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of 2 node servers.
Fig. 2 is that the embodiment of the present invention one is provided with the structural representation of the online hot-swap device of hard disk on two server node.
Fig. 3 is that the embodiment of the present invention two is provided with the structural representation of the online hot-swap device of hard disk on two server node.
Fig. 4 is combined signal schematic diagram.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, scheme of the present invention is described in further detail.
The invention provides a kind of device of realizing the online hot-swap of hard disk, this application of installation is in the first and second server nodes, and wherein, first server node comprises the first controller and hard disk; Second server node comprises second controller and hard disk; This device comprises: a plurality of chips, and the quantity of described chip is corresponding with the quantity of hard disk in two server nodes, and each chip one end and each hard disk connect one to one, and the other end connects respectively the first controller and second controller; The hard disk that each chip selects different controller managements self to be connected for basis from the two path control signal of the first controller and second controller.
According to said apparatus, the method that the present invention realizes the online hot-swap of hard disk comprises:
The control signal that the chip being connected when the hard disk with second server node receives from the first controller is high level, while being low level from the control signal of second controller, the hard disk in second server node is switched to the first controller management;
The control signal that the chip being connected when the hard disk with first server node receives from the first controller is low level, while being high level from the control signal of second controller, the hard disk in first server node is switched to second controller and is managed.
For clearly demonstrating the present invention, enumerate concrete scene below and be elaborated.
Embodiment mono-
Fig. 2 is that the embodiment of the present invention one is provided with the structural representation of the online hot-swap device of hard disk on two server node.As shown in Figure 2, first server node comprises the first controller and two hard disks, and two hard disks are respectively hard disk 1, hard disk 2; Second server node comprises second controller and two hard disks, and two hard disks are respectively hard disk 3, hard disk 4.So, the online hot-swap device of hard disk is to there being 4 chips, and chip 1 and chip 2 are connected respectively hard disk 1 and hard disk 2; Chip 3 and chip 4 are connected respectively hard disk 3 and hard disk 4.The other end of each chip connects respectively the first controller and second controller.
Chip, in specific implementation, can be JMB572, or the MAX4888 of Maxim etc., the present invention is not construed as limiting.In fact, also have hard disk backboard (not shown) on each server node, all hard disks on this server node are installed on hard disk backboard, by hard disk backboard, to hard disk, provide power supply.The online hot-swap device of hard disk of the present invention, corresponding to the chip of each server node, is also assembled on the hard disk backboard of this server node, and hard disk backboard can provide power supply to chip simultaneously.
Chip 1 receives the control signal Node1_A0 from the first controller (PCH1), and from the control signal Node2_A0 of second controller (PCH2), the signal of exporting to hard disk 1 is Output1.
Chip 2 receives the control signal Node1_A0 from the first controller, and from the control signal Node2_A0 of second controller, the signal of exporting to hard disk 2 is Output1.
Chip 3 receives the control signal Node1_A0 from the first controller, and from the control signal Node2_A0 of second controller, the signal of exporting to hard disk 3 is Output2.
Chip 4 receives the control signal Node1_A0 from the first controller, and from the control signal Node2_A0 of second controller, the signal of exporting to hard disk 4 is Output2.
Each chip is according to the hard disk of selecting different controller managements self to be connected from the two path control signal of the first controller and second controller, and concrete truth table is as shown in table 1:
| Node1_A0 | Node2_A0 | Output1 | Output2 |
| 1 | 0 | PCH1 | PCH1 |
| 0 | 1 | PCH2 | PCH2 |
| 1 | 1 | PCH1 | PCH2 |
| 0 | 0 | Nothing | Nothing |
Table 1
As can be seen from Table 1, the control signal receiving from the first controller when chip 1 is high level, while being low level from the control signal of second controller, the signal Output1 that exports to hard disk 1 is PCH1, that is to say, when the first controller PCH1 normally works, can directly access the hard disk 1 of oneself;
The control signal receiving from the first controller when chip 1 is low level, while being high level from the control signal of second controller, the signal Output1 that exports to hard disk 1 is PCH2, that is to say, when the first controller PCH1 breaks down, when second controller PCH2 normally works, chip 1 switches hard disk 1 to manage to second controller PCH2;
The control signal receiving from the first controller when chip 1 is high level, while being high level from the control signal of second controller, the signal Output1 that exports to hard disk 1 is PCH1, that is to say, when the first controller PCH1 normally works, can directly access the hard disk 1 of oneself;
The control signal receiving from the first controller when chip 1 is low level, while being low level from the control signal of second controller, signal is not exported to hard disk 1, that is to say, when the first controller PCH1 and second controller PCH2 break down, hard disk 1 cannot be accessed.
The control signal receiving from the first controller when chip 3 is high level, while being low level from the control signal of second controller, the signal Output2 that exports to hard disk 3 is PCH1, that is to say, when the first controller PCH1 normally works, when second controller PCH2 breaks down, chip 3 switches hard disk 3 to the first controller PCH1 management;
The control signal receiving from the first controller when chip 3 is low level, while being high level from the control signal of second controller, the signal Output2 that exports to hard disk 3 is PCH2, that is to say, when second controller PCH2 normally works, can directly access the hard disk 3 of oneself;
The control signal receiving from the first controller when chip 3 is high level, while being high level from the control signal of second controller, the signal Output2 that exports to hard disk 3 is PCH2, that is to say, when second controller PCH2 normally works, can directly access the hard disk 3 of oneself;
The control signal receiving from the first controller when chip 3 is low level, while being low level from the control signal of second controller, signal is not exported to hard disk 3, that is to say, when the first controller PCH1 and second controller PCH2 break down, hard disk 3 cannot be accessed.
Due to the chip in same server node, the signal of exporting to the hard disk self connecting is identical, so chip 2 is selected the principle of different controller management hard disks 2, selects different controller management hard disks 1 identical from chip 1; So chip 4 is selected the principle of different controller management hard disks 4, select different controller management hard disks 3 identical from chip 3, do not repeat them here.
In actual applications, a server node comprises that a hard disk is a kind of fairly simple situation.Concrete, while comprising a hard disk in a server node, first server node comprises the first controller and the first hard disk; Second server node comprises second controller and the second hard disk; Described device comprises the first chip and the second chip; First chip one end connects respectively the first controller and second controller, and the other end connects the first hard disk; Second chip one end connects respectively the first controller and second controller, and the other end connects the second hard disk; The first chip, for according to the two path control signal from the first controller and second controller, is selected different controller managements the first hard disk; The second chip, for according to the two path control signal from the first controller and second controller, is selected different controller managements the second hard disk.
Embodiment bis-
In actual applications, not only controller end fault can cause hard disk to access, other hardware faults cannot be accessed as the hard disk that extremely also may cause of central processing unit (CPU) etc., so the preferred embodiment of the present invention also joins the status signal of CPU in the trigger pip of hard disk hot-swap.Specific implementation is:
First server node also comprises a CPU who is connected with the first controller, and second server node also comprises the 2nd CPU being connected with second controller;
In the two path control signal that each chip receives, first via signal further comprise from the control signal of a CPU and the first controller carry out with operation after combined signal; The second road signal further comprise from the control signal of the 2nd CPU and second controller carry out with operation after combined signal.
It should be noted that, except CPU and controller, also may there be more other hardware device faults to cause subordinate server node cannot access local hard drive, so, method of the present invention the status signal of other hardware devices and CPU and controller can be carried out jointly with operation after, trigger the device realize the online hot-swap of hard disk and carry out hard disk switching.
Fig. 3 is that the embodiment of the present invention two is provided with the structural representation of the online hot-swap device of hard disk on two server node.As shown in Figure 3, the present embodiment, for clearly demonstrating problem, only illustrates a hard disk in each server node, in practical application, may comprise a plurality of hard disks.First server node comprises a CPU, the first controller and the first hard disk; Second server node comprises the 2nd CPU, second controller and the second hard disk.So, the online hot-swap device of hard disk is to there being 2 chips, and the first chip and the second chip are connected respectively the first hard disk and the second hard disk.The other end of each chip connects respectively the first controller and second controller, and the first controller is connected with a CPU, and second controller is connected with the 2nd CPU.
The first chip using the control signal PCH1_A0 of the control signal CPU1_A0 from a CPU and the first controller (PCH1) carry out with operation after combined signal as first via signal Node1_A0, using the control signal PCH2_A0 of the control signal CPU2_A0 from the 2nd CPU and second controller (PCH2) carry out with operation after combined signal as first via signal Node2_A0, the signal of exporting to the first hard disk is Output1.
The second chip using the control signal PCH1_A0 of the control signal CPU1_A0 from a CPU and the first controller (PCH1) carry out with operation after combined signal as first via signal Node1_A0, using the control signal PCH2_A0 of the control signal CPU2_A0 from the 2nd CPU and second controller (PCH2) carry out with operation after combined signal as the second road signal Node2_A0, the signal of exporting to the second hard disk is Output2.
The hard disk that each chip selects different controller managements self to be connected according to Node1_A0 with Node2_A0 two path control signal, concrete truth table is still as shown in table 1.Combined signal schematic diagram as shown in Figure 4.That is to say, need CPU end and the normal work simultaneously of controller end of same server node, the signal after merging is only high level, as long as abnormal or fault occur a side, the signal after merging is all low level.
When the first chip receives Node1_A0, be high level, when Node2_A0 is low level, the signal Output1 that exports to the first hard disk is PCH1, that is to say, when the first controller and a CPU normally work, can directly access the first hard disk of oneself;
When the first chip receives Node1_A0, it is low level, when Node2_A0 is high level, the signal Output1 that exports to the first hard disk is PCH2, that is to say, when the first controller and/or a CPU break down, when second controller and the 2nd CPU normally work, the first chip switches the first hard disk to second controller PCH2 and manages;
When the first chip receives Node1_A0, be high level, when Node2_A0 is high level, the signal Output1 that exports to the first hard disk is PCH1, that is to say, when the first controller and a CPU normally work, can directly access the first hard disk of oneself;
When the first chip receives Node1_A0, be low level, when Node2_A0 is low level, signal is not exported to the first hard disk, that is to say, when first server node and second server node all break down, the first hard disk cannot be accessed.
When the second chip receives Node1_A0, it is high level, when Node2_A0 is low level, the signal Output2 that exports to the second hard disk is PCH1, that is to say, when the first controller and a CPU normally work, when second controller and/or the 2nd CPU break down, the second chip switches the second hard disk to the first controller PCH1 management;
When the second chip receives Node1_A0, be low level, when Node2_A0 is high level, the signal Output2 that exports to the second hard disk is PCH2, that is to say, when second controller and the 2nd CPU normally work, can directly access the second hard disk of oneself;
When the second chip receives Node1_A0, be high level, when Node2_A0 is high level, the signal Output2 that exports to the second hard disk is PCH2, that is to say, when second controller and the 2nd CPU normally work, can directly access the second hard disk of oneself;
When the second chip receives Node1_A0, be low level, when Node2_A0 is low level, signal is not exported to the second hard disk, that is to say, when first server node and second server node all break down, the second hard disk cannot be accessed.
In sum, method and the device of realizing the online hot-swap of hard disk provided by the invention, in the time of can breaking down at the hardware device of a server node, switching is managed the hard disk in this failed server node by another server node, thereby avoids causing hard disk to access because of the fault of hardware.Further, according to principle of the present invention, for four server device nodes; or the situation of six server nodes, also can arrange the online hot-swap device of corresponding hard disk, and the hard disk of realizing 4 nodes switches mutually; or the hard disk of 6 nodes switches mutually, all in protection scope of the present invention.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. realize a device for the online hot-swap of hard disk, this application of installation is in the first and second server nodes, and wherein, first server node comprises the first controller and hard disk; Second server node comprises second controller and hard disk; This device comprises:
A plurality of chips, the quantity of described chip is corresponding with the quantity of hard disk in two server nodes, and each chip one end and each hard disk connect one to one, and the other end connects respectively the first controller and second controller; The hard disk that each chip selects different controller managements self to be connected for basis from the two path control signal of the first controller and second controller.
2. device as claimed in claim 1, is characterized in that, while comprising a hard disk in a server node, first server node comprises the first controller and the first hard disk; Second server node comprises second controller and the second hard disk;
Described device comprises the first chip and the second chip;
First chip one end connects respectively the first controller and second controller, and the other end connects the first hard disk;
Second chip one end connects respectively the first controller and second controller, and the other end connects the second hard disk;
The first chip, for according to the two path control signal from the first controller and second controller, is selected different controller managements the first hard disk; The second chip, for according to the two path control signal from the first controller and second controller, is selected different controller managements the second hard disk.
3. device as claimed in claim 1, is characterized in that, described server node further comprises hard disk backboard, and each chipset is loaded on hard disk backboard.
4. device as claimed in claim 1, is characterized in that, described chip is JMB572, or the MAX4888 of Maxim.
5. device as claimed in claim 1, is characterized in that, first server node also comprises the first central processor CPU being connected with the first controller, and second server node also comprises the 2nd CPU being connected with second controller;
In the two path control signal that each chip receives, first via signal further comprise from the control signal of a CPU and the first controller carry out with operation after combined signal; The second road signal further comprise from the control signal of the 2nd CPU and second controller carry out with operation after combined signal.
6. the device described in application rights requirement 1 is realized a method for the online hot-swap of hard disk, it is characterized in that, the method comprises:
The control signal that the chip being connected when the hard disk with second server node receives from the first controller is high level, while being low level from the control signal of second controller, the hard disk in second server node is switched to the first controller management;
The control signal that the chip being connected when the hard disk with first server node receives from the first controller is low level, while being high level from the control signal of second controller, the hard disk in first server node is switched to second controller and is managed.
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