Product manual

CDA 7 5630 Product Manual
5-6 77 A1 69UP Rev00
This sophisticated fencing mechanism determines a disk management hardware
failure at two levels:
Level 1: a director discovers through use of its online
self-testing that one of its SCSI paths is failing. The
director signals CDA 7 of this condition and the
director it is paired with automatically takes control of
the failing path.
Level 2: CDA 7 determines a director has failed and fences it
out. The director’s associated pair automatically takes
control of all its devices.