Planning: RAID Controller Modules 35System Password ResetThe storage array system password can be reset if it is forgotten. To reset thepassword, push and hold down the password reset switch for at least 5seconds. The password is deleted. See Figure 3-1 to locate the password resetswitch.The RAID controller module allows you to change the password. For moreinformation about setting your password, see "Setting a Password" on page 71.NOTE: The reset switch can be accessed by using a small object such as the tip ofa pen.Cache Functions and FeaturesCache MirroringCache mirroring function copies accepted host-write data from the primarycontroller to the partner controller. This action ensures that host-write data issafely mirrored to the partner controller before successful completion status isreturned to the host. If a controller fails, the surviving controller safely retainsall mirrored data. Cache mirroring is enabled by default.Write-Back CacheIn Write-back Cache, write operations result in a completion signal beingsent to the host operating system as soon as the cache receives the data to bewritten. The target physical disk receives the data at a more appropriate timein order to increase controller performance. In dual-active controllerconfigurations with Write-back Caching enabled, the write data is alwaysTable 3-1. Shutdown Threshold TypeThreshold Temperature Exceeding Event DescriptionNominal failure threshold A critical event is setMaximum failure threshold Shutdown of the system power supplies occurswithin 3 minutesShutdown threshold Shutdown of the system power supplies occurswithin 5 seconds
