Methods for avoiding over-commitment of virtual capacity in a re

Details Methods for avoiding over-commitment of virtual capacity in a re Methods for avoiding over-commitment of virtual capacity in a re

1995-02-01

1997-07-22

Swann, Tod R.

39518204, G06G 1216

Patent

active

056511337

ABSTRACT:
A hierarchic disk array data storage system has a disk array with multiple storage disks and a disk array controller which coordinates data transfer to and from the disks. The storage disks define a physical storage space. A RAID management system maps a RAID-level virtual storage space onto the physical storage space. The RAID-level virtual storage space presents the physical storage space as multiple RAID areas. The RAID areas include mirror RAID areas which contain mirror allocation blocks to store data according to mirror redundancy and parity RAID areas which contain parity allocation blocks to store data according to parity redundancy. The RAID management system dynamically migrates data between the mirror and parity RAID areas in a manner which optimizes performance and data reliability. As new storage requests are made, the RAID management system evaluates the existing storage conditions and computes a total virtual capacity that is available to the user given a disk array configuration. A total virtual capacity can be calculated without including the capacity of any given storage disk in the disk array data storage system. The total virtual capacity calculation is used to support hot spare space reservation, disk removal, rebuild of a failed disk, and to prevent over-commitment of storage to user data.

REFERENCES:
patent: 5155835 (1992-10-01), Belsan
patent: 5195100 (1993-03-01), Katz et al.
patent: 5237658 (1993-08-01), Walker et al.
patent: 5278838 (1994-01-01), Ng et al.
patent: 5287462 (1994-02-01), Jibbe et al.
patent: 5289418 (1994-02-01), Youngerth
patent: 5297258 (1994-03-01), Hale et al.
patent: 5392244 (1995-02-01), Jacobson et al.
patent: 5479653 (1995-12-01), Jones
patent: 5485571 (1996-01-01), Menon
patent: 5491810 (1996-02-01), Allen
patent: 5519844 (1996-05-01), Stallmo
patent: 5568629 (1996-10-01), Gentry et al.
patent: 5574851 (1996-11-01), Rathunde
patent: 5579475 (1996-11-01), Blaum et al.
patent: 5590276 (1996-12-01), Andrews
patent: 5592648 (1997-01-01), Schultz et al.
patent: 5596709 (1997-01-01), Bond et al.

Affiliated with

Also associated with

Rating

Methods for avoiding over-commitment of virtual capacity in a re does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Methods for avoiding over-commitment of virtual capacity in a re, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods for avoiding over-commitment of virtual capacity in a re will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1566118