Method and system to maintain maximum performance levels in all disk groups by using controller VDs for background tasks

摘要

Disclosed is a system and method for performing reconstruction or on-line capacity expansion, background tasks, on a disk group configured on a controller with minimal impact on the other disk groups configured on the same controller. A user is enabled to continuously experience increased performance on all source virtual disks configured on the controller since the DRAM is always dedicated for I/O performance.

主权项

1. A method of performing a background operation on a first disk group while at least one other disk group performs normal caching, wherein each of said first and other disk groups comprises cache contents, said method comprising:
determining if there are any write-through Secondary Cache disks configured; if a write-through Secondary Cache disk is configured:
invalidating cache contents of the write-through Secondary Cache disk;dissociating the write-through Secondary Cache disk from a source disk; andusing the write-through Secondary Cache disk for the background operation; if a write-through Secondary Cache disk is not configured:
identifying a write-back Secondary Cache disk;flushing cached contents of the write-back Secondary Cache disk to a source disk;dissociating the write-back Secondary Cache disk from the source disk; andusing the write-back Secondary Cache disk for the background operation; and upon completing of the background operation:
restoring Secondary Cache disk cache policies; andreverting any dissociated Secondary Cache disks back to being associated with the source disk as originally associated.