CN108304139A - A kind of method and device for realizing space release in Solid-state disc array - Google Patents
A kind of method and device for realizing space release in Solid-state disc array Download PDFInfo
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- CN108304139A CN108304139A CN201710017320.1A CN201710017320A CN108304139A CN 108304139 A CN108304139 A CN 108304139A CN 201710017320 A CN201710017320 A CN 201710017320A CN 108304139 A CN108304139 A CN 108304139A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0683—Plurality of storage devices
- G06F3/0689—Disk arrays, e.g. RAID, JBOD
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0608—Saving storage space on storage systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0646—Horizontal data movement in storage systems, i.e. moving data in between storage devices or systems
- G06F3/0652—Erasing, e.g. deleting, data cleaning, moving of data to a wastebasket
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Abstract
The invention discloses a kind of to realize the method and device that space discharges in Solid-state disc array, is related to technical field of memory, method includes：The space release command that Solid-state disc array is sent by parsing host obtains the volume and release block information in space to be released；Solid-state disc array searches the band to be released of the volume according to the volume information in acquired space to be released in the RAID virtual disks of multiple solid-state disks composition；For Solid-state disc array according to the band to be released and the release block information found, the memory space occupied to the band carries out release processing.For the present invention in the Solid-state disc array of configuration RAID, fragment when ensureing the consistency of the RAID stripe when unmap is operated, while discharging can merge processing.
Description
Technical field
The present invention relates to technical field of memory, more particularly to it is a kind of in Solid-state disc array realize space release method and
Device.
Background technology
SSD (Solid State Drives, solid state disk) is a kind of novel hard disk based on nand flash memories, single by control
Member and storage unit (flash chip) composition.It is stored unlike traditional mechanical hard disk using magnetic characteristic, needs when read-write to lean on
Mechanical part, as motor, disc, the operations such as magnetic head, solid-state disk will be far superior in speed, shock resistance, power consumption, weight etc.
Mechanical hard disk.
The flash chip that solid-state disk uses is made of multiple planes, and each plane is divided into thousands of a blocks, each block
Usually it is made of 64-128 page.Flash memory supports three kinds of primary operationals：Reading and writing, erasing.Read-write operation is executed in page, is wiped
Division operation is to remove all pages in the block, it is necessary to be executed in block, erasing operation must be done before writing.One block passes through one
(being typically 10000~100000 times) can be lost after determining the erasing of number.Since flash memory has limited erasing times, the longevity of SSD
Life is generally also conditional.Keep each block write-in number of solid-state disk equal as possible by Wear leveling algorithm inside solid-state disk
Weighing apparatus.
RAID that Solid-state disc array is made of solid-state disk (Redundant Array of Independent Disks,
Redundant array of independent disks) array, for carrying out redundancy protecting to data.RAID stripe includes data portion and check part,
When one of disk corrupted data, the data of damage can be restored according to the data of other disks.According to level of redundancy,
RAID type has RAID1, RAID5, RAID6 etc..
When we are when host deletes a file, the address mark that file system occupies these data is ' sky '.But
, only in the operation of file system level, hard disk itself has been not aware that the data of those addresses ' invalid ' for this.Host passes through
Unmap orders notice Solid-state disc array discharges invalid space.The free space of solid-state disk can be increased in this way, it is equal to improve abrasion
The effect of weighing apparatus.
When host notification Solid-state disc array discharges idle space, the address section of release may not be a complete item
Band, but a portion of band.If only discharged to the segment space of band, the data for being released space can be again
Initialization, cause RAID stripe verification and it is inconsistent.
In " System and Method to Keep Parity Consistent in an Array of Solid
In State Drives when Data Blocks are De-Allocated " patents (patent No. 8,938,584), proposition
Scheme be in the segment space of release strip, wait releases operation return after, recalculate band verification and.This scheme has
Following disadvantage：1) after verifying and recalculate, the verification and ablation process of solid-state disk of increase are needed.Solid-state disk is come
It says, more write-onces, total access times will be primary less.2) verify and recalculate the initialization number dependent on release section
It is worth, the initial value assumed in scheme is full 0.The solid-state disk initial value of different manufacturers may be variant, this can not be completely secured
Unanimously.
In addition some schemes only discharge complete band when space discharges, and do not handle band fragment.This
If sample Free up Memory is a part for band, this segment space can not discharge, and cause debris accumulation.
Invention content
The technical issues of scheme provided according to embodiments of the present invention solves is in the Solid-state disc array of configuration RAID, no
It can guarantee the consistency of the RAID stripe when unmap is operated.
A kind of method that realizing space release in Solid-state disc array provided according to embodiments of the present invention, including：
The space release command that Solid-state disc array is sent by parsing host obtains volume and the release section in space to be released
Information；
Solid-state disc array is according to the volume information in acquired space to be released, in the RAID virtual disks of multiple solid-state disks composition
The middle band to be released for searching the volume；
Solid-state disc array occupies the band according to the band to be released and the release block information found
Memory space carries out release processing.
Preferably, the RAID virtual disks have mapping relations with the Solid-state disc array, and in the RAID virtual disks
On create multiple volumes, be equipped with multiple bands in each volume.
Preferably, the space release command that the Solid-state disc array is sent by parsing host, obtains space to be released
Volume and release block information include：
The space release command that the front end interface receiving host of Solid-state disc array is sent, and the space release command is sent out
Give SCSI (Small Computer System Interface, small computer system interface) target modules；
The SCSI target modules of Solid-state disc array receive and parse through the space commands, obtain the volume in space to be released
With release block information, and by the volume in acquired space to be released and release block information be sent to vol modules.
Preferably, the Solid-state disc array is formed according to the volume information in acquired space to be released in multiple solid-state disks
RAID virtual disks in search the band to be released of the volume and include：
The vol modules of Solid-state disc array receive volume and the release in the space to be released that the SCSI target modules are sent
Block information；
The vol modules of Solid-state disc array are according to the volume information in the space to be released, in the RAID of multiple solid-state disks composition
The volume in space to be released is determined in virtual disk；
The vol modules of Solid-state disc array, according to the release block information, search institute after the volume for determining space to be released
It determines the band to be released of volume, and sends it to RAID module.
Preferably, the Solid-state disc array is according to the band to be released and the release block information found, to institute
State band occupancy memory space carry out release processing include：
The RAID module of Solid-state disc array determines institute according to the band to be released and the release block information that are found
State release section whether be the band to be released whole；
If it is determined that the release section is the whole of the band to be released, then RAID module discharges what the band occupied
Memory space, and RAID member disks is notified to discharge the space of corresponding solid-state disk；
If it is determined that the release section is not the whole of the band to be released, then sector bitmap of the RAID module in release
Middle label has discharged, and the fragment information of release is recorded in band.
A kind of device that realizing space release in Solid-state disc array provided according to embodiments of the present invention, including：
Acquisition module, the space release command for being sent by parsing host, obtains volume and the release in space to be released
Block information；
Searching module, it is empty in the RAID of multiple solid-state disks composition for the volume information according to acquired space to be released
The band to be released of the volume is searched in quasi- disk；
Release module, for according to the band to be released and the release block information found, being accounted for the band
Memory space carries out release processing.
Preferably, the RAID virtual disks have mapping relations with the Solid-state disc array, and in the RAID virtual disks
On create multiple volumes, be equipped with multiple bands in each volume.
Preferably, the acquisition module includes：
Front end interface for the space release command that receiving host is sent, and the space release command is sent to
SCSI target units；
SCSI target units obtain volume and the release area in space to be released for receiving and parsing through the space commands
Between information, and by the volume in acquired space to be released and release block information be sent to vol units.
Preferably, the searching module includes：
Vol units, the volume for receiving the space to be released that the SCSI target units are sent and release section letter
Breath, and according to the volume information in the space to be released, space to be released is determined in the RAID virtual disks of multiple solid-state disks composition
Volume, and according to the release block information, search the band to be released for determining and rolling up, and send it to RAID units.
Preferably, the release module includes：
RAID units, for according to the band to be released and the release block information found, determining the release
Section whether be the band to be released whole, when determine it is described release section be the band to be released whole, then release
The memory space that the band occupies is put, and RAID member disks is notified to discharge the space of corresponding solid-state disk, and is worked as described in determination
Release section is not the whole of the band to be released, then marks and discharged in the sector bitmap of release, and by the broken of release
Piece information is recorded in band.
The scheme provided according to embodiments of the present invention ensure that RAID stripe when Solid-state disc array carries out unmap operations
Consistency reduces the band fragment generated when unmap operations.When Free up Memory is less than band length, solid-state can be improved
The release rate of disk array idle space increases the free space of solid-state disk, improves the abrasion equilibrium effect of solid-state disk.
Description of the drawings
Fig. 1 is a kind of method flow diagram for realizing space release in Solid-state disc array provided in an embodiment of the present invention；
Fig. 2 is a kind of schematic device for realizing space release in Solid-state disc array provided in an embodiment of the present invention；
Fig. 3 is the block diagram of Solid-state disc array provided in an embodiment of the present invention；
Fig. 4 is the management structure chart of RAID provided in an embodiment of the present invention；
Fig. 5 is process chart when RAID module provided in an embodiment of the present invention receives unmap orders；
The schematic diagram of fragment merging treatment when Fig. 6 is space release provided in an embodiment of the present invention；
Fig. 7 is process chart when RAID module provided in an embodiment of the present invention receives write command.
Specific implementation mode
Below in conjunction with attached drawing to a preferred embodiment of the present invention will be described in detail, it should be understood that described below is excellent
Select embodiment only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
Fig. 1 is a kind of method flow diagram for realizing space release in Solid-state disc array provided in an embodiment of the present invention, such as
Shown in Fig. 1, including：
Step S101：The space release command that Solid-state disc array is sent by parsing host, obtains the volume in space to be released
With release block information；
Step S102：Solid-state disc array is formed according to the volume information in acquired space to be released in multiple solid-state disks
The band to be released of the volume is searched in RAID virtual disks；
Step S103：Solid-state disc array is according to the band to be released and the release block information found, to described
The memory space that band occupies carries out release processing.
Wherein, the RAID virtual disks have mapping relations with the Solid-state disc array, and on the RAID virtual disks
Multiple volumes are created, multiple bands are equipped in each volume.
Wherein, the space release command that the Solid-state disc array is sent by parsing host, obtains the volume in space to be released
Include with release block information：The space release command that the front end interface receiving host of Solid-state disc array is sent, and by the sky
Between release command be sent to SCSI target modules；The SCSI target modules of Solid-state disc array receive and parse through the space
Order, obtains the volume and release block information in space to be released, and the volume in acquired space to be released and release section are believed
Breath is sent to vol modules.
Wherein, the Solid-state disc array is formed according to the volume information in acquired space to be released in multiple solid-state disks
The band to be released that the volume is searched in RAID virtual disks includes：The vol modules of Solid-state disc array receive the SCSI target
The volume and release block information in the space to be released that module is sent；The vol modules of Solid-state disc array are according to the space to be released
Volume information, the volume in space to be released is determined in the RAID virtual disks of multiple solid-state disks composition；The vol modules of Solid-state disc array
After the volume for determining space to be released, according to the release block information, the band to be released for determining volume is searched, and sent out
Give RAID module.
Wherein, the Solid-state disc array is according to the band to be released and the release block information found, to described
The memory space that band occupies carries out release processing：The RAID module of Solid-state disc array is according to the item to be released found
Band and the release block information, determine it is described release section whether be the band to be released whole；If it is determined that described release
The whole that section is the band to be released is put, then RAID module discharges the memory space that the band occupies, and notifies RAID
Member disk discharges the space of corresponding solid-state disk；If it is determined that the release section is not the whole of the band to be released, then RAID
Module marks in the sector bitmap of release have been discharged, and the fragment information of release is recorded in band.
Fig. 2 is a kind of schematic device for realizing space release in Solid-state disc array provided in an embodiment of the present invention, such as
Shown in Fig. 2, including：Acquisition module 201, the space release command for being sent by parsing host, obtains space to be released
Volume and release block information；Searching module 202, for the volume information according to acquired space to be released, in multiple solid-state disks
The band to be released of the volume is searched in the RAID virtual disks of composition；Release module 203, for be released according to what is found
Band and the release block information, the memory space occupied to the band carry out release processing.
Wherein, the RAID virtual disks have mapping relations with the Solid-state disc array, and on the RAID virtual disks
Multiple volumes are created, multiple bands are equipped in each volume.
Wherein, the acquisition module 201 includes：Front end interface, for the space release command that receiving host is sent, and will
The space release command is sent to SCSI target units；SCSI target units, for receiving and parsing through the space
Order, obtains the volume and release block information in space to be released, and the volume in acquired space to be released and release section are believed
Breath is sent to vol units.
Wherein, the searching module 202 includes：Vol units, for receiving waiting for for the SCSI target units transmission
The volume and release block information of Free up Memory, and according to the volume information in the space to be released, in multiple solid-state disks composition
The volume in space to be released is determined in RAID virtual disks, and according to the release block information, is searched and determined the to be released of volume
Band, and send it to RAID units.
Wherein, the release module 203 includes：RAID units, for according to the band to be released that is found and described
Discharge block information, determine the release section whether be the band to be released whole, when determining that the release section is
The whole of the band to be released then discharges the memory space that the band occupies, and notifies that the release of RAID member disks is corresponding solid
The space of state disk, and when determining that the release section is not the whole of the band to be released, then in the sector bitmap of release
Middle label has discharged, and the fragment information of release is recorded in band.
Fig. 3 is the block diagram of Solid-state disc array provided in an embodiment of the present invention, as shown in figure 3, Solid-state disc array includes control
The components such as device, memory, front end interface, back end interface, solid-state disk, front end interface connect host, and back end interface connects solid-state disk.Control
The module run in device processed includes SCSI target modules, VOL modules, RAID module etc..Responsible pair of SCSI target modules
The SCSI protocol that host is sent is parsed.VOL modules are responsible for management and the upper reading and writing data processing of volume of volume.RAID module is responsible for
The processing such as the management of RAID, the reading and writing data of band, band release.Solid-state disk forms RAID virtual disks, is created on virtual disk
Volume is mapped to host use.
When the memory space on host release volume (for example deleting file), host sends unmap orders and notifies solid-state
Disk array discharges respective stored space and is solved to unmap orders after Solid-state disc array receives the unmap orders of host transmission
Analysis, obtains the volume to be discharged and release block information, then notifies that RAID module is discharged.Increase in RAID manages structure
Message bit pattern is discharged, if release section is a part for band, the fragment information of release is recorded in band.Work as band
In all data space when being collectively labeled as release, then release strip the space occupied, and notify the release of RAID member disks corresponding
The space of solid-state disk.
Fig. 4 is the management structure chart of RAID module provided in an embodiment of the present invention, as shown in figure 4, the management of RAID module
Structure includes the information such as RAID configurations, tape index, band chunk sizes, release bitmap.RAID configures the class for describing RAID
The information such as type, member disk list.Tape index describes serial number of the band in RAID virtual disks, is searched for band.Band
Chunk is a base unit of constituting bar band, including data block and check block.Band chunk sizes describe the number of chunk
According to length.Release bitmap describe the sector in band release information, the fragment release conditions of band when for recording unmap,
Each sector is indicated with a bit.
Fig. 5 is process chart when RAID module provided in an embodiment of the present invention receives unmap orders, as shown in figure 5,
Including：When RAID module receives unmap orders, according to the band rolled up and release block information lookup is specified, if release section
It is a part for band, then the fragment information of release is recorded in band.When data space all in band is collectively labeled as
When release, then release strip the space occupied, and RAID member disks is notified to discharge the space of corresponding solid-state disk.Process flow describes
It is as follows：
Step 1, Free up Memory are divided by band, calculate the address section for falling into first band；
Step 2 judges whether full band；
A) if it is, discharging the band, and member disk is notified to discharge corresponding memory space；
B) if it is not, then the sector bitmap of release is labeled as having discharged.
Step 3 judges whether the data sector in band all has been labeled as having discharged；
A) if it is, discharging the band, and member disk is notified to discharge corresponding memory space.
Step 4 judges whether all spaces are processed；
A) if it is, going to step 5；
B) if it is not, then taking out next band, 2 processing are gone to step.
Step 5, processing terminate.
The schematic diagram of fragment merging treatment when Fig. 6 is space release provided in an embodiment of the present invention, as shown in fig. 6, with 3
For the RAID5 of disk composition, 3 solid-state disks constitute a RAID5 virtual disk, and strips A includes 2 parts of data D0, D1 and portion
Verify P1.D0 is stored in solid-state disk 1, and D1 is stored in solid-state disk 2, and P1 is stored in solid-state disk 3.1st time, host discharges the spaces D0,
In RAID stripe, D0 free tokens are to have discharged.2nd time, host discharges the spaces D1, in RAID stripe, D1 free tokens
To have discharged.Then RAID module judges that data space D0, D1 of band have been labeled as discharging, and starts depositing for release strip A
Space is stored up, notice solid-state disk 1,2,3 discharges the memory space of D0, D1, P1 respectively.After release, D0, D1, P1 are corresponded on solid-state disk
Space be free time, solid-state disk free space increase.
Fig. 7 is process chart when RAID module provided in an embodiment of the present invention receives write command, as shown in fig. 7,
When RAID module receives write command, according to the band rolled up and release block information lookup is specified, item is write data into first
Then the sector mark of write-in is not discharge by band.Process flow is as follows：
Step 1, writing area are divided by band, calculate the address section for falling into first band；
Step 2 writes data into band；
Step 3, by the sector mark of write-in be do not discharge；
Step 4 judges whether all areas are processed.
A) if it is, going to step 5；
B) if it is not, then taking out next band, 2 processing are gone to step.
Step 5, processing terminate
The scheme provided according to embodiments of the present invention ensures in the Solid-state disc array of configuration RAID when unmap is operated
The consistency of RAID stripe, while fragment when discharging can merge processing.
Although describing the invention in detail above, but the invention is not restricted to this, those skilled in the art of the present technique
It can be carry out various modifications with principle according to the present invention.Therefore, all to be changed according to made by the principle of the invention, all it should be understood as
Fall into protection scope of the present invention.
Claims (10)
1. a kind of method for realizing space release in Solid-state disc array, including：
The space release command that Solid-state disc array is sent by parsing host obtains the volume and release section letter in space to be released
Breath；
Solid-state disc array is looked into according to the volume information in acquired space to be released in the RAID virtual disks of multiple solid-state disks composition
Look for the band to be released of the volume；
Solid-state disc array is according to the band to be released and the release block information found, the storage occupied to the band
Space carries out release processing；
Wherein, the RAID refers to redundant array of independent disks.
2. according to the method described in claim 1, the RAID virtual disks and the Solid-state disc array have a mapping relations, and
Multiple volumes are created on the RAID virtual disks, multiple bands are equipped in each volume.
3. according to the method described in claim 1, the space release command that the Solid-state disc array is sent by parsing host, is obtained
It takes the volume in space to be released and discharges block information and include：
The space release command that the front end interface receiving host of Solid-state disc array is sent, and the space release command is sent to
SCSI target modules；
The SCSI target modules of Solid-state disc array receive and parse through the space commands, obtain the volume in space to be released and release
Block information is put, and the volume in acquired space to be released and release block information are sent to vol modules；
Wherein, the SCSI refers to small computer system interface.
4. according to the method described in claim 3, volume information of the Solid-state disc array according to acquired space to be released,
The band to be released that the volume is searched in the RAID virtual disks of multiple solid-state disks composition includes：
The vol modules of Solid-state disc array receive volume and the release section in the space to be released that the SCSI target modules are sent
Information；
The vol modules of Solid-state disc array are virtual in the RAID of multiple solid-state disks composition according to the volume information in the space to be released
The volume in space to be released is determined in disk；
The vol modules of Solid-state disc array are after the volume for determining space to be released, and according to the release block information, lookup determines
The band to be released of volume, and send it to RAID module.
5. according to the method described in claim 4, the Solid-state disc array is according to the band to be released that is found and described releases
Block information is put, carrying out release processing to the memory space that the band occupies includes：
The RAID module of Solid-state disc array according to the band to be released and the release block information found, determine described in release
Put section whether be the band to be released whole；
If it is determined that the release section is the whole of the band to be released, then RAID module discharges the storage that the band occupies
Space, and RAID member disks is notified to discharge the space of corresponding solid-state disk；
If it is determined that the release section is not the whole of the band to be released, then sector bitmap acceptance of the bid of the RAID module in release
Note has discharged, and the fragment information of release is recorded in band.
6. a kind of device for realizing space release in Solid-state disc array, including：
Acquisition module, the space release command for being sent by parsing host obtain volume and the release section in space to be released
Information；
Searching module, for the volume information according to acquired space to be released, in the RAID virtual disks of multiple solid-state disks composition
The middle band to be released for searching the volume；
Release module, for according to the band to be released and the release block information found, being occupied to the band
Memory space carries out release processing.
7. device according to claim 6, the RAID virtual disks and the Solid-state disc array have a mapping relations, and
Multiple volumes are created on the RAID virtual disks, multiple bands are equipped in each volume.
8. device according to claim 6, the acquisition module include：
The space release command for the space release command that receiving host is sent, and is sent to SCSI by front end interface
Target units；
SCSI target units obtain the volume and release section letter in space to be released for receiving and parsing through the space commands
Breath, and the volume in acquired space to be released and release block information are sent to vol units.
9. device according to claim 8, the searching module include：
Vol units, the volume for receiving the space to be released that the SCSI target units are sent and release block information, and
According to the volume information in the space to be released, the volume in space to be released is determined in the RAID virtual disks of multiple solid-state disks composition,
And according to the release block information, the band to be released for determining volume is searched, and send it to RAID units.
10. device according to claim 9, the release module include：
RAID units, for according to the band to be released and the release block information found, determining the release section
Whether be the band to be released whole, when determine it is described release section be the band to be released whole, then discharge institute
The memory space of band occupancy is stated, and RAID member disks is notified to discharge the space of corresponding solid-state disk, and when the determining release
Section is not the whole of the band to be released, then marks and discharged in the sector bitmap of release, and the fragment of release is believed
Breath is recorded in band.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020007030A1 (en) * | 2018-07-06 | 2020-01-09 | 华为技术有限公司 | System controller and system garbage recovery method |
| CN111124257A (en) * | 2018-10-31 | 2020-05-08 | 伊姆西Ip控股有限责任公司 | Method, apparatus and computer program product for managing redundant arrays of independent disks |
| WO2022040914A1 (en) * | 2020-08-25 | 2022-03-03 | Micron Technology, Inc. | Unmap backlog in a memory system |
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| CN111124257B (en) * | 2018-10-31 | 2023-09-26 | 伊姆西Ip控股有限责任公司 | Method, apparatus and computer program product for managing redundant arrays of independent disks |
| WO2022040914A1 (en) * | 2020-08-25 | 2022-03-03 | Micron Technology, Inc. | Unmap backlog in a memory system |
| US12039194B2 (en) | 2020-08-25 | 2024-07-16 | Micron Technology, Inc. | Unmap backlog in a memory system |
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