Table of Contents
Advertisement
Shutting Down a Clustered Configuration (CLI)
embedded in the Oracle ZFS Storage Appliance is designed to ensure that there is no single
point of failure, and to protect both data and availability against any plausible failure without
adding undue cost or complexity to the system. It is still possible that massive multiple failures
will cause loss of service and/or data, in much the same way that no RAID layout can protect
against an unlimited number of disk failures.
FIGURE 20
Fortunately, most such failure scenarios arise from human error and are completely preventable
by installing the hardware properly and training staff in cluster setup and management best
practices. Administrators should always ensure that all three cluster I/O links are connected
and functional (see illustration), and that all storage cabling is connected as shown in the
setup poster delivered with your appliances. It is particularly important that two paths are
detected to each disk shelf (see illustration) before placing the cluster into production and at all
times afterward, with the obvious exception of temporary cabling changes to support capacity
increases or replacement of faulty components. Administrators should use alerts to monitor
the state of cluster interconnect links and disk shelf paths and correct any failures promptly.
Ensuring that proper connectivity is maintained will protect both availability and data integrity
if a hardware or software component fails.
220
Oracle ZFS Storage Appliance Administration Guide, Release OS8.6.x • September 2016
Preventing Split-Brain
Advertisement
Table of Contents
