CN101776984A - Method and device for processing disk roam in storage system - Google Patents
Method and device for processing disk roam in storage system Download PDFInfo
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Abstract
The invention provides a method and a device for processing disk roam in a storage system, which relates to the field of storage. The method comprises the following steps of: when a storage system generates disk roam, updating the drive and/or the slot position of a preset disk which does not generate the disk roam into the current drive and/or the slot position of the disk; and according to the updated drive and/or slot position and PAD information when the disk roam is not generated, constructing the information of Redundant Arrays of Inexpensive Disks (RAID).
Description
Technical field
The present invention relates to field of storage, relate in particular to a kind of method and apparatus of in storage system, handling disk roam.
Background technology
The middle and high end storage system is made up of multi-controller and a plurality of disk chassis usually, and wherein each controller all articulates a plurality of disk chassis (Just Bundle Of Disks JBOD), wherein has a plurality of grooves position on each disk chassis, can dispose a disk on each groove position.If the user has been put into wrong groove position after taking out disk from the groove position, perhaps under open state, carry out the plug of disk, the inconsistent problem of drive on disk and the user interface can appear, and this phenomenon is to belong to the disk roam problem.In case the disk roam problem occurs, (Redundant Array of IndependentDisk RAID) will have problems, and causes the user can't visit data in the disk to utilize the disk drive to make up redundant array of inexpensive disk on the disk basis.
For avoiding causing the RAID information errors behind the disk roam, in the prior art, when the initialization disk, store the standby RAID information of this disk in advance.Disk roam takes place after, after former RAID information is disintegrated, extract the standby RAID information of having stored from disk, reconstruction RAID information, but adopt said method, reduced the spendable storage space of user on the disk.
Summary of the invention
The invention provides a kind of method of handling disk roam in storage system, the implementation that makes up RAID information is simple.
To achieve the above object of the invention, the invention provides following technical scheme:
A kind of method of handling disk roam in storage system comprises:
When storage system generation disk roam, with set in advance disk roam does not take place the time disk drive and/or groove position be updated to current drive of this disk and/or groove position;
According to drive and/or groove position after upgrading and the RAID information when disk roam does not take place, make up redundant array of inexpensive disk (RAID) information.
Further, described method also has following characteristics: the drive of described disk correspondence and groove position obtain in the following way:
Obtain the SAS address of drive and groove position and the corresponding relation of drive and disk;
According to the SAS address drive and groove position are mated, obtain the corresponding relation of drive and groove position;
According to drive,, obtain the mapping relations between disk, drive and the groove position to the corresponding relation of described drive and groove position and the corresponding relation of described drive and disk.
Further, described method also has following characteristics: described disk identifies by major key (LU).
Further, described method also has following characteristics: described structure RAID information specifically comprises:
The RAID information architecture RAID of disk correspondence after adopting the drive after upgrading and should upgrading drive.
A kind of controller comprises:
Update module is used for when storage system generation disk roam, with set in advance disk roam does not take place the time disk drive and/or groove position be updated to current drive of this disk and/or groove position;
Make up module, be used for according to drive and/or groove position after upgrading and the RAID information when disk roam does not take place, make up redundant array of inexpensive disk (RAID) information.
Further, described controller also has following characteristics: described controller also comprises:
Acquisition module, be used to obtain the SAS address of drive and groove position and the corresponding relation of drive and disk, and drive and groove position are mated according to the SAS address, obtain the corresponding relation of drive and groove position, again according to drive, to the corresponding relation of described drive and groove position and the corresponding relation of described drive and disk, obtain the mapping relations between disk, drive and the groove position.
Further, described controller also has following characteristics: described controller is by major key (LU) sign disk.
Further, described controller also has following characteristics:
Described structure module specifically is used for: the RAID information architecture RAID of disk correspondence behind the drive after employing is upgraded and this renewal drive.
Technical scheme provided by the invention, when storage system generation disk roam, drive and/or groove position when disk roam does not take place are updated to current drive of this disk and/or groove position, again according to drive and/or groove position after upgrading and the RAID information when disk roam does not take place, make up redundant array of inexpensive disk (RAID) information, RAID when guaranteeing disk roam does not take place can use, adopt the available new RAID information of RAID information architecture storage system, implementation is simple and need not to take the standby RAID information of storage space storage at disk in advance, has improved the free space of disk.
Description of drawings
Fig. 1 is for handling the method flow diagram of disk roam in storage system among the present invention;
Fig. 2 is for handling another process flow diagram of method of disk roam in storage system among the present invention;
Fig. 3 is the structural representation that the invention provides a kind of controller;
Fig. 4 is another structural representation of middle controller embodiment illustrated in fig. 3.
Embodiment
Below in conjunction with accompanying drawing technical scheme provided by the invention is described further.
As shown in Figure 1, the invention provides a kind of method of in storage system, handling disk roam, comprising:
Method provided by the invention, when storage system generation disk roam, drive and/or groove position when disk roam does not take place are updated to current drive of this disk and/or groove position, again according to drive and/or groove position after upgrading and the RAID information when disk roam does not take place, make up redundant array of inexpensive disk (RAID) information, RAID when guaranteeing disk roam does not take place can use, adopt the available new RAID information of RAID information architecture storage system, implementation is simple and need not to take the standby RAID information of storage space storage at disk in advance, has improved the free space of disk.
Below technical scheme provided by the invention is described further, as shown in Figure 3:
Concrete, the process of obtaining this standard mapping relation can realize in the following way, describes with (SuSE) Linux OS:
Step 1, obtain and locally-attached whole disk chassis;
Concrete, send expander sg query statement to this disk chassis, as sginfo-l.
Expander is an extender, is the physical connection between disk chassis and the controller, according to connecting the supported protocol that uses, has relevant adapter, and has expansion number (being sg number) by the extender that the adapter slave controller picks out on controller.In the present invention, disk chassis on controller, can show one sg number, by inquiring about this sg, have the details of this disk chassis.
Step 2, obtain SAS (Serial Attached SCSI, the serial SCSI) address of groove position on each expander sg;
Concrete, send expander sg query statement to this disk chassis, as sg_ses-p 0xa/dev/sg*, wherein ' * ' refers in the step 1 sg number.
Step 3, according to drive in the storage system, obtain the SAS address and the LU address of disk on this disk chassis groove position;
Concrete, send the disc information query statement, as sg_inq-p 0x83/dev/sd*, wherein ' * ' refers to the drive in this storage system.
Wherein step 1～2 there is no sequencing with step 3.
Mapping relations between the drive of step 4, the major key of setting up groove position with identical SAS address, disk and disk.
| JBOD number | Slot number | The SAS address | Drive | LU (major key) |
| ??0 | ??01 | ??0x5000c500178db8a2 | ??c | ??0x5000c5001996c37??4 |
| ??0 | ??02 | ??0x500163600012390a | ??d | ??0x5000c5001999c4b??d |
| ??…… | ??…… | ??…… | ??…… | ??…… |
Table 1 mapping relations table
Concrete, in first mapping relations and second mapping relations, judge on the disk chassis whether LU information under each SAS address, drive information is identical with groove position information, if it is identical, determine to treat school mapping relations and standard mapping relationship consistency, determine not take place disk roam, flow process finishes; Otherwise expression treats that school mapping relations and standard mapping relation are inconsistent, determines the generation disk roam, comprising 3 kinds of situations, below is that example describes with the mapping relations of drive c in the table 1:
Situation one: disk is inserted on the correct groove position, but disk corresponding wrong drive on storage system;
Situation two: disk is the correct drive of correspondence on storage system, but disk is inserted on the wrong groove position;
Situation three: disk is inserted on the wrong groove position, and disk corresponding wrong drive on storage system.
After determining that disk roam takes place, execution in step 204;
Below be that example describes with the mapping relations of drive c in the table 1:
Situation one: disk is inserted on the correct groove position, but disk is corresponding wrong drive on storage system, for example the correct drive of disk correspondence is the C dish, but behind the generation disk roam, the drive of this disk correspondence is a D dish, and may to be the user in storage system be under the open state this situation puts back to former groove position once more after disk taken out and cause;
| JBOD number | Slot number | The SAS address | Drive | LU (major key) |
| ??0 | ??01 | ??0x5000c500178db8a2 | ??c | ??0x5000c5001996c374 |
| ??0 | ??01 | ??0x5000c500178db8a2 | ??d | ??0x5000c5001996c374 |
| ??…… | ??…… | ??…… | ??…… | ??…… |
After disk roam takes place in the c dish, when if system uses the C dish, because the C dish does not exist, and can produce mistake, system is by the LU address of all drive correspondences of traversal, as send disc information query statement sg_inq-p 0x83/dev/sd*, wherein ' * ' refers to all drives in this storage system, obtains having the drive of former c dish LU address, i.e. drive d, then delete the former drive c of this disk correspondence, the drive that upgrades this disk is d.
Situation two: disk is corresponding correct drive on storage system, but disk is inserted on the wrong groove position, and may to be the user in storage system be under the off-mode this situation is put into other groove positions after disk taken out and causes.
| JBOD number | Slot number | The SAS address | Drive | LU (major key) |
| ??0 | ??01 | ??0x5000c500178db8a2 | ??c | ??0x5000c5001996c374 |
| ??0 | ??02 | ??0x500163600012390a | ??c | ??0x5000c5001996c374 |
| ??…… | ??…… | ??…… | ??…… | ??…… |
Because drive is correct, the RAID that makes up on this disk can not make mistakes, but, when newly-built RAID, can choose the disk of having set up RAID easily, therefore need upgrade the standard mapping table, specifically comprise: send expander sg query statement to this disk chassis, as sg_ses-p 0xa/dev/sg*, wherein ' * ' refers in the step 201 in the step 1 sg of indication number, obtain disk chassis (JBOD0) and go up the SAS address and the LU address of whole grooves position, obtain the SAS address of this current correspondence in LU address, obtain the groove position of this current correspondence in LU address again according to the SAS address that obtains, current groove position is 02 in this example, and the former groove position 01 of then upgrading this LU address correspondence is groove position 02.
Can certainly select to rebuild the standard mapping table, detailed process is referring to step 201.
Sight three: disk is inserted on the wrong groove position, and disk corresponding wrong drive on storage system, and may to be the user in storage system be under the open state this situation is put into other groove positions after disk taken out and causes.
| JBOD number | Slot number | The SAS address | Drive | LU (major key) |
| ??0 | ??01 | ??0x5000c500178db8a2 | ??c | ??0x5000c5001996c374 |
| ??0 | ??02 | ??0x500163600012390a | ??d | ??0x5000c5001996c374 |
| ??…… | ??…… | ??…… | ??…… | ??…… |
The similar situation 1 of this situation, need to upgrade drive, but this situation is exactly the disk chassis groove position information that travels through than the work that situation 1 needs to do more, compares with the present SAS address of disk, upgrade the disk groove position information in the mapping table, as above show, original drive is c, and system discovery c drive can't use, need to upgrade, step is as follows:
Step 1: send the disc information query statement, as sg_inq-p 0x83/dev/sd*, wherein ' * ' refers to the drive in this storage system.The LU that inquires the d dish is consistent with the LU of former drive c, then upgrades drive d to mapping table, and the SAS address entries of d is upgraded;
Step 2: send expander sg query statement to this disk chassis, as sg_ses-p 0xa/dev/sg*, wherein ' * ' refers in the step 201 in the step 1 sg of indication number.The SAS address that obtains is carried out rightly with the SAS address of d dish, if consistent, then upgrades groove position information to mapping table, and for example current in this example is groove position 02, is groove position 01 originally.
Concrete, because RAID information is to adopt drive information to set up, for example RAID information is to use drive a, drive b and drive c to make up, if not roaming, start just can make up RAID according to drive.If generation disk roam, c has not had such as drive, and the standard mapping table after upgrading obtains, and drive c originally is updated to drive d, RAID information in the corresponding disk of then former drive c is not disintegrated, and the drive c that only needs to be used to make up RAID information is revised as drive d and gets final product.
If newly-built RAID information, after disk roam takes place in disk wrong plug groove position, can obtain which disk for not making up the disk of RAID information the standard mapping relation after upgrading, newly-built again RAID information, thus avoid taking place behind the disk roam same disk to be repeated to make up RAID information in the prior art.
This shows, when storage system generation disk roam, the RAID information that disk is preserved is not disintegrated, but by revising drive and/or groove position, adopt original RAID information to make up, thereby need not in disk, to store in advance RAID information and cause waste of storage space, adopt the method for present embodiment can save storage space.
Need to prove, because JBOD is by the controller master control of two redundancies usually, and the SAS address of finding, groove position may can not guarantee it is on all four on different controllers, usually in order to guarantee the unanimity of disk, in safeguarding the mapping relations process, not only inquire about the SAS address of disk, also inquire about LU address (logical unit), this address is supported by producer's agreement, is the uniqueness sign of disk.
Corresponding, the invention provides a kind of controller that adopts said method, as shown in Figure 3, comprising:
Make up module 302, be used for according to drive and/or groove position after upgrading and the RAID information when disk roam does not take place, make up redundant array of inexpensive disk (RAID) information.
As shown in Figure 4, described controller can further include:
Wherein said controller is by major key (LU) sign disk.
Described structure module 302 specifically is used for: the RAID information architecture RAID of disk correspondence behind the drive after employing is upgraded and this renewal drive.
One of ordinary skill in the art will appreciate that all or part of step that realizes the foregoing description is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises one of step or its combination of method embodiment when carrying out.
In addition, each functional unit in each embodiment of the present invention can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If described integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in the computer read/write memory medium.
The above-mentioned storage medium of mentioning can be a ROM (read-only memory), disk or CD etc.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the described protection domain of claim.
Claims (8)
1. a method of handling disk roam in storage system is characterized in that, comprising:
When storage system generation disk roam, with set in advance disk roam does not take place the time disk drive and/or groove position be updated to current drive of this disk and/or groove position;
According to drive and/or groove position after upgrading and the RAID information when disk roam does not take place, make up redundant array of inexpensive disk (RAID) information.
2. method according to claim 1 is characterized in that, the drive of described disk correspondence and groove position obtain in the following way:
Obtain the SAS address of drive and groove position and the corresponding relation of drive and disk;
According to the SAS address drive and groove position are mated, obtain the corresponding relation of drive and groove position;
According to drive,, obtain the mapping relations between disk, drive and the groove position to the corresponding relation of described drive and groove position and the corresponding relation of described drive and disk.
3. method according to claim 2 is characterized in that, described disk identifies by major key (LU).
4. according to the arbitrary described method of claim 1 to 3, it is characterized in that described structure RAID information specifically comprises:
The RAID information architecture RAID of disk correspondence after adopting the drive after upgrading and should upgrading drive.
5. a controller is characterized in that, comprising:
Update module is used for when storage system generation disk roam, with set in advance disk roam does not take place the time disk drive and/or groove position be updated to current drive of this disk and/or groove position;
Make up module, be used for according to drive and/or groove position after upgrading and the RAID information when disk roam does not take place, make up redundant array of inexpensive disk (RAID) information.
6. controller according to claim 5 is characterized in that, described controller also comprises:
Acquisition module, be used to obtain the SAS address of drive and groove position and the corresponding relation of drive and disk, and drive and groove position are mated according to the SAS address, obtain the corresponding relation of drive and groove position, again according to drive, to the corresponding relation of described drive and groove position and the corresponding relation of described drive and disk, obtain the mapping relations between disk, drive and the groove position.
7. method according to claim 6 is characterized in that, described controller is by major key (LU) sign disk.
8. according to the arbitrary described method of claim 5 to 7, it is characterized in that,
Described structure module specifically is used for: the RAID information architecture RAID of disk correspondence behind the drive after employing is upgraded and this renewal drive.
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