HP StorageWorks NAS 1500s Installation Manual page 38

Figure 10: Disk management, partitioning
Under normal circumstances, the NAS 1500s boots up from the
Primary OS Logical Drive. If the system experiences a drive
failure, the Adaptec 2410SA will begin an audible alert to inform
the user of a drive failure. If a single drive failure occurs, it will be
transparent to the OS. If a second drive fails, the Data volume will
be lost and will need to be restored from backup. When the
Primary OS has a failure such as system files becoming
corrupted, registry corrupted and the system hangs during boot,
the 1500s will failover to the Secondary OS. The system can be
run from the Secondary OS, however, the user should backup
their user data and then use the Quick Restore DVD to restore the
system to the factory default state as soon as conveniently
possible. The number of boot attempts on the Primary OS can be
manually configured in the BIOS. It is recommended that the
timeout value be set to 5 minutes or greater.
38 NAS 1500s Installation Guide