Release 6.0 57User Guide Chapter 1 Overview3. When the snapshot function is usedIf the snapshot function is used, updated information is copied from disk drives to the cachememory when the disk array unit is started.Because of this, the disk array unit’s start up time is delayed by 10 seconds per 1 TB of the updatedinformation.1.3.1.4 Power control systems without using power switches1. Control SystemsTable 1-12: About Control Systems describes power control systems that do not use powerswitches.Control systems described here are supported only in the M300 series.Table 1-12: About Control SystemsControl system Host OS FeatureESMPRO/AC(Works together with UPS)WindowsLinuxThis control system uses a server for powercontrol, which can be associated with hosts.For details, see ESMPRO/AC manual.ESMPRO/AC(Automatic operation)WindowsLinuxThis control system uses a server for powercontrol and allows for automatic operation.For details, see ESMPRO/AC manual.UPS(Does not work with UPS)Not specified This control system is for instantaneous powerinterruption.Because there is no association, when theretention period of UPS elapses, temporarypower-off followed by reboot takes place.Cached data, however, is protected.Association is a mechanism to notify the disk array system of interruption of powersupply to the UPS and to start shutdown. If you use the UPS control system, establish redundancy by providing a UPS foreach power supply of a device. Make sure that a failure of a single UPS does not cause simultaneous power failureof PS0 and PS1.
