The startup period of the storage system is too long. When a storage device is powered off, the data that has not been written to hard disks is stored in coffer disks temporarily. When the storage device is powered on next time, the dirty data will be written to hard disks. In this case, the storage device has one controller enclosure and seven disk enclosures. Each enclosure contains 21 disks and 168 disks in total. A total of two hundred and eighty 200 GB LUNs are configured on these disks. Before the first power-on, dirty data is stored in coffer disks. After the power-on, the storage system takes about 20 minutes and 15 minutes to connect disks and flush the dirty data to disks. The details are as follows: Apr 7 14:57:19 OceanStor kernel: softver:1030320409,node [ST3500320NS:SN06:ES2_250G_500G_SN06.bin],disk[ST3450856FC:0005]//First disk connection Apr 7 15:15:52 OceanStor kernel: softver:1030320409,node [HDE721010SLA330:ST6OA3AA:HT1T_A3AA.bin],disk[ST3450856FC:0005]//Last disk connection Apr 7 15:16:29 OceanStor kernel: SYS_INFO: Cache flush dirty complete. flag , LUN ,Result //Flushing the data in the cache to hard disks starts. Apr 7 15:30:27 OceanStor kernel: SYS_INFO: Remote Cache flush dirty complete. flag , LUN ,Result//Flushing the data in the cache to hard disks stops. During the process, the startup status of the storage system is Flushing the dirty data and the storage system is in Safe mode on the Web page. This is a normal phenomenon. The storage system will be successfully powered on. Apr 7 15:31:20 OceanStor kernel: SYS_INFO: Local controller status: Apr 7 15:31:20 OceanStor kernel: SYS_INFO: Peer controller status: // indicates a normal state, that is, the local and peer controllers become normal at 15:31. Apr 7 15:31:20 OceanStor kernel: Alarm ID:-1,Module:47,Type:1,Param:System power on succeeded. was sent to web ui //The storage system becomes normal finally. After the storage system is restarted for the second time, it has no dirty data. Therefore, the storage system is started soon.