Method for providing information, electronic equipment and computer program product
A technology of computer programs and devices, applied in the direction of calculation, cache memory details, input/output process of data processing, etc., can solve problems such as inconsistency, inability to update information, metadata mismatch, etc.
Pending Publication Date: 2021-05-04
EMC IP HLDG CO LLC
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Problems solved by technology
The disk array management module usually cannot update all the information in the metadata of the disk array in an atomic way, which may cause some information in the metadata to not match each other during the update process
In this way, when other modules obtain the metadata of the disk array from the disk array management module, the information in the metadata obtained by other modules may be inconsistent
Method used
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[0014] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0015] As used herein, the term "comprise" and its variants mean open inclusion, ie "including but not limited to". The term "or" means "and / or" unless otherwise stated. The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one further embodiment". The terms "first", "second", etc. may refer to di...
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The embodiment of the invention relates to a method for providing information, electronic equipment and a computer program product. The method includes steps of obtaining a first copy of updated the information from a first device that updates the information, where a second copy of information before updating is cached in a first buffer that acts as an active buffer, and the second copy is provided in response to receiving a request to provide information from a second device; caching the first copy in a second buffer acting as a backup buffer; in response to the first copy being cached in the second buffer, switching the second buffer to an active buffer and switching the first buffer to a spare buffer; and in response to receiving a request to provide information from a second device, providing the first copy cached in the active buffer to the second device. The method is advantaged in that consistency of the provided information can be ensured under the condition that a lock is not used.
Description
technical field [0001] Embodiments of the present disclosure generally relate to the field of data storage, and in particular to methods, electronic devices and computer program products for providing information. Background technique [0002] In a storage system using a disk array (for example, redundant array of independent disks, RAID) for data storage, the disk array management module usually needs to provide information related to the disk array to other modules (for example, an upper module) in the storage system, Such as, device information, status information, etc. These pieces of information are collectively referred to as metadata of the disk array. The metadata of the disk array is usually updated at the disk array management module. The disk array management module usually cannot update all the information in the metadata of the disk array in an atomic manner, which may cause some information in the metadata to not match each other during the update process. I...
Claims
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IPC IPC(8): G06F3/06
CPCG06F3/0607G06F3/0638G06F3/0689G06F3/0656G06F3/0619G06F2212/261G06F12/0868G06F12/0802G06F2212/60G06F3/0604
Inventor 马春高健高宏坡康剑斌董继炳
Owner EMC IP HLDG CO LLC