US 2020/0028907 A1Published application

Clustered storage system configured for bandwidth efficient processing of writes at sizes below a native page size

AssigneeEMC IP Holding Company LLC

InventorsLior Kamran, Amitai Alkalay, Zvi Schneider, Vladimir Shveidel, Oran Baruch

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Abstract

A control module of a clustered storage system in one embodiment is configured to receive a write request for a data block of a page, to retrieve an existing content-based signature for the page, to identify from the existing content-based signature a first one of the data modules currently storing the page, and to compute a content-based signature of the data block. The control module is further configured to send the content-based signature of the data block to the first data module, to receive from the first data module an updated content-based signature for the page computed utilizing the content-based signature of the data block, to identify from the updated content-based signature a second one of the data modules that will store the page as updated to include the data block, and to provide information regarding the data block and the updated content-based signature to the second data module for utilization in storage of the updated page.

Claims20

Dependent claims

An apparatus comprising:

a storage system comprising a plurality of storage nodes each comprising one or more storage devices;
each of the storage nodes further comprising:
a processor coupled to a memory;
and
a set of processing modules configured to communicate over one or more networks with corresponding sets of processing modules on other ones of the storage nodes;
the sets of processing modules of the storage nodes each comprising at least one control module and at least one data module, with different portions of a logical address space of the storage system being assigned to different ones of the control modules, each of the control modules being configured to process received write requests in cooperation with particular ones of the data modules for storage of corresponding pages in particular ones of the storage devices;
wherein a given one of the control modules is configured:
to receive a write request for a data block of a page;
to retrieve an existing content-based signature for the page;
to identify from the existing content-based signature a first one of the data modules currently storing the page;
to compute a content-based signature of the data block;
to send the content-based signature of the data block to the first data module;
to receive from the first data module an updated content-based signature for the page computed utilizing the content-based signature of the data block;
to identify from the updated content-based signature a second one of the data modules that will store the page as updated to include the data block;
and
to provide information regarding the data block and the updated content-based signature to the second data module for utilization in storage of the updated page.

13 more elements

A method comprising:

configuring a storage system to include a plurality of storage nodes each comprising at least one storage device, each of the storage nodes further comprising a set of processing modules configured to communicate over one or more networks with corresponding sets of processing modules on other ones of the storage nodes;
the sets of processing modules each comprising at least one control module and at least one data module, with different portions of a logical address space of the storage system being assigned to different ones of the control modules, each of the control modules being configured to process received write requests in cooperation with particular ones of the data modules for storage of corresponding pages in particular ones of the storage devices;
a given one of the control modules:
receiving a write request for a data block of a page;
retrieving an existing content-based signature for the page;
identifying from the existing content-based signature a first one of the data modules currently storing the page;
computing a content-based signature of the data block;
sending the content-based signature of the data block to the first data module;
receiving from the first data module an updated content-based signature for the page computed utilizing the content-based signature of the data block;
identifying from the updated content-based signature a second one of the data modules that will store the page as updated to include the data block;
and
providing information regarding the data block and the updated content-based signature to the second data module for utilization in storage of the updated page;
wherein the method is performed by at least one processing device comprising a processor coupled to a memory.

10 more elements

A computer program product comprising a non-transitory processor-readable storage medium having stored therein program code of one or more software programs, wherein the program code when executed by at least one processing device causes said at least one processing device:

to configure a storage system to include a plurality of storage nodes each comprising at least one storage device, each of the storage nodes further comprising a set of processing modules configured to communicate over one or more networks with corresponding sets of processing modules on other ones of the storage nodes;
the sets of processing modules each comprising at least one control module and at least one data module, with different portions of a logical address space of the storage system being assigned to different ones of the control modules, each of the control modules being configured to process received write requests in cooperation with particular ones of the data modules for storage of corresponding pages in particular ones of the storage devices;
a given one of the control modules being configured:
to receive a write request for a data block of a page;
to retrieve an existing content-based signature for the page;
to identify from the existing content-based signature a first one of the data modules currently storing the page;
to compute a content-based signature of the data block;
to send the content-based signature of the data block to the first data module;
to receive from the first data module an updated content-based signature for the page computed utilizing the content-based signature of the data block;
to identify from the updated content-based signature a second one of the data modules that will store the page as updated to include the data block;
and
to provide information regarding the data block and the updated content-based signature to the second data module for utilization in storage of the updated page.

9 more elements

Dependencies are inferred from the claim text.