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Dell PowerEdge RAID Controller 11 User’s Guide PERC H755, H750, H355, and H350 Controller Series

Background initialization

Background initialization (BGI) is an automated process that writes parity or mirror data on newly created virtual disks. BGI does not run on RAID 0 virtual disks. You can control the BGI rate in the Dell OpenManage storage management application. Any change to the BGI rate does not take effect until the next BGI is performed.
NOTE:
  • You cannot disable BGI permanently. If you cancel BGI, it automatically restarts within five minutes.
  • Unlike full or fast initialization of virtual disks, background initialization does not clear data from the physical disks.
  • Consistency Check (CC) and BGI typically cause some loss in performance until the operation completes.
  • PERC H355 adapter SAS, PERC H355 front SAS, PERC H350 adapter SAS, and PERC H350 Mini Monolithic SAS background operations will not run until the operating system boots.

Consistency check and BGI perform similar functions in that they both correct parity errors. However, CC reports data inconsistencies through an event notification, while BGI does not. You can start CC manually, but not BGI.


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