Write new data of a first block size in a raid - array, which both the parity as well as the data in a second block size stores

摘要

A method is implemented in a device, which method comprises:New data received by a ‘ redundant arrangement of independent plates ’ (raid) - controller (102), which are to be written, wherein the new data into blocks of a first block size is to be specified;Reading age data (606) and age parity (608) by means of the one of raid - controller (102), which corresponds to the old data stored in blocks of a second block size, which is greater than the first block size;Calculating a new parity (610) by means of the one of raid - controller (102), based on the new data, the old data, and of the old parity; andWriting of the new data and the new parity by the raid - controller (102), aligned on the blocks of the second block size, wherein parts of the old data, which is not specified by the raid - controller (102) are overwritten, likewise into the blocks of the second block size are written, wherein the one of raid - controller (102) plates which are configured as raid - 5, wherein:the reading by means of two sets of read operations of the plates is carried out, wherein a first set of read operations the reading of the old data (606) and a second set of read operations the reading of the old parity includes (608); andthe writing by means of two sets of write operations on the plates is carried out, wherein a first set of write operations, the writing of the new data and parts of the old data, which are not overwritten, comprises (612) and a second set of write operations, the writing of the new parity includes (614) orthe one of raid - controller (102) plates which are configured as raid - 6, wherein the old parity a first set of the old parity, and a second set of the old parity, wherein the new parity a first set of the new parity, and a second set of the new parity, andwherein:the reading by means of three sets of read operations of the plates is carried out, wherein a first set of the reading read operationsn="30" the old data, a second set of read operations the reading of the first set of the old parity, and a third set of read operations the reading of the second set of the old parity; andthe writing by means of three sets of write operations on the plates is carried out, wherein a first set of write operations, the writing of the new data and parts of the old data, which are not overwritten, a second set of write operations, the writing of the first set of the new parity, and a third set of write operations, the writing of the second set of the new parity includes.