Dell Products Inc.

Victor Lei Gao

Weibing Zhang

Hao Fang

Henry Hao Fang

Techniques for transmitting a data block involve receiving, from a client, a request for reading the data block. Such techniques further involve determining, at a data block layer, whether the data block needs to be compressed at a protocol layer based on a flag indicating whether the data block has been compressed and a storage size of the data block. Such techniques further involve transferring, in response to determining that the data block does not need to be compressed at the protocol layer, an indication that the data block does not need to be compressed at the protocol layer from the data block layer to the protocol layer. Such techniques further involve sending the data block to the client through the protocol layer without compressing the data block at the protocol layer.

Method, device and computer program product for transmitting data block

Backing up data is described. An example method includes acquiring data block deduplication information of source data and pieces of backup node deduplication information of backup nodes in a backup node set. Then, based on the data block deduplication information and the pieces, deduplication rates of the source data are determined relative to the backup nodes in the backup node set. In addition, based on the deduplication rates for the plurality of backup nodes, a target backup node is selected for backing up the source data from the backup node set. Data features of the to-be-backed-up source data are utilized to determine the deduplication rate of the source data relative to each backup node, thereby selecting the target backup node through the deduplication rates of the backup nodes. The space occupation of backup nodes can also be reduced when backing up the source data, thereby achieving better space utilization.

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Beijing, China

Victor Lei Gao