Disk storage apparatus and method for converting random writes to sequential writes while retaining physical clustering on disk
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United States of America Patent
Stats
-
Sep 17, 1996
Grant Date -
N/A
app pub date -
Mar 24, 1993
filing date -
Mar 24, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A high performance disk subsystem has a disk write mechanism that provides high throughput for random disk writes by dividing the disks into a data portion and a log portion. A fault-tolerant memory in the disk controller is used to temporarily store data blocks or pages which are to be written in the data portion of the disks. The updated blocks are sorted in the fault-tolerant memory in accordance with their physical home location on the data portion of the disks. Sorted runs are temporarily written out to the log portion of the disk. In a parallel process, sorted runs are retrieved from the log portion of the disks, merged in the fault-tolerant memory, and written out to their home location on the data portion of the disks, which converts random disk writes to largely sequential I/O while retaining physical clustering of the data on disk.
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