A takeover system and method for high availability in the face of component failures for a
multiple-node storage system cluster is provided. When a takeover is triggered either …

(57) ABSTRACT A method for wear level-based allocation in a storage pool. The method
includes receiving a first request to write a first data item in a storage pool, where the storage …

AGGREGAEB AGGREGAEC fails, new data may still be accessed by the system (the striped
aggregates), both to write new data, and to read data stored on the failed aggregate. In …

7,162.486 B2 1/2007 Patel et al. 7,174,352 B2 2/2007 Kleiman et al. 7,200,715 B2 4/2007
Kleiman et al. 7,236,987 B1* 6/2007 Faulkner et al............ TO7 104.1 7,313,720 B1 12/2007 …

BACKGROUND Filesystems track where data is stored in memory and where free or
available space exists in memory. Bitmaps are one way to track this free space. A bitmap is …

Provided is a method in which data is received at the first storage unit. A first information unit,
a second information unit, and a third information unit are generated, wherein the first …

4,375.. 100 A 2, 1983 E. etal age operating system of a storage system to select disks to be
4,467.42. A sió84 White added to one or more RAID groups of a volume. The spares 45 …

Information technology systems including storage systems, may need protection from site
disasters or outages, where outages may be planned or unplanned. Furthermore …

3,876,978 A 4, 1975 Bossen et al. 4,092,732 A 5, 1978 Ouchi 4,201.976 A 5, 1980 Patel
4,205,324 A 5, 1980 Patel 4,375,100 A 2/1983 Tsuji et al. 4,467,421 A 8, 1984 White …

One embodiment is a method that divides a cluster file system into multiple segments with
each segment including one or more local counters. The method then checks for inconsis …