公开(公告)号：CA2876379A1

公开(公告)日：2016-06-29

申请号：CA2876379

申请日：2014-12-29

Applicant: IBM CANADA LTD - IBM CANADA LIMITEE

Inventor： STORM ADAM J ,  GARCIA-ARELLANO CHRISTIAN M

IPC: G06F12/00

Abstract: An illustrative embodiment tunes memory in presence of asymmetrical memory transfer costs by assigning a threshold value asynchronously to a memory consumer and a bias value to the threshold. Responsive to an ability to free memory by the consumer and to reclaim memory, direct the memory consumer to reclaim memory. Responsive to a time out or the reclaim exceeds a predetermined amount of time for the memory consumer, multiply the biased threshold value by a predetermined adjustment factor. Responsive to freeing memory under the predetermined time, divide the biased benefit threshold value by the predetermined adjustment factor. Update per memory consumer control values and logically partition the memory according to an ability of the memory consumer to free the memory in a defined ratio. The memory consumer reclaims memory from the second portion and replenishes the second portion asynchronously from the first portion, maintaining the defined ratio.

公开(公告)号：CA2719673A1

公开(公告)日：2011-01-18

申请号：CA2719673

申请日：2010-11-05

Applicant: IBM CANADA

Inventor： BAE MYUNG M ,  BUCKLER ANDREW D ,  CHAN YUE FONG Y ,  GARCIA-ARELLANO CHRISTIAN M ,  HURAS MATTHEW A ,  MUELLER MARKUS ,  SACHEDINA AAMER ,  SCHMUCK FRANK B ,  VOLOBUEV YURI

IPC: G06F11/07 ,  G06F15/16

Abstract: An illustrative embodiment of a computer-implemented process for fencing shared cluster resources in event of a possible split-brain, identifies a failing resource of a node within a set of shared resources to form an identified failing resource, fences a subset of the set of shared resources to form a winning subset of shared resources and prevents the identified failing resource from communicating with the winning subset of shared resources using a white list maintained at each database system of the winning subset of shared resources. The computer-implemented process further determines whether the identified failing resource has been cleared to form a cleared failing resource and responsive to a determination that the identified failing resource has been cleared, rejoins the cleared failing resource with the winning subset of the set of shared resources absent a re-boot of the cleared failing resource.