Data storage method for DASD arrays using striping based on file

Details Data storage method for DASD arrays using striping based on file Data storage method for DASD arrays using striping based on file

1992-01-24

1995-08-15

Lee, Thomas C.

Boots, shoes, and leggings

364DIG1, 3642481, 364DIG2, 3649613, 364962, 364963, 395441, G06F 1202

Patent

active

054427525

ABSTRACT:
In a data storage method for checksum DASD arrays, files are classified by length and/or other characteristic. Each relatively shorter file is written to an address or contiguous addresses typically on a single DASD of the array. The checksum stored on a checksum DASD is updated by reading the existing checksum, XORing that with the new data and writing the new checksum. Each relatively longer file is subdivided into portions all of the same size, and the number of equal portions is equal to the number of data DASDs where the file is to be written. The portions are interleaved in a stripe of addresses on the data DASDs, and the checksum of the portions is written to the checksum DASD. The characteristic transition length is dynamically varied in order that each interleaved file is provided with contiguous addresses matched to the file size.

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