The S2600 is configured with no UPS. The default LUN policy is write through. The controller version is 1.04.02.106.T05 and the mandatory write back function is unavailable.
The LUN write through policy causes that the write performance is only 15 MB.
LUN write back: Data is written to cache first. After the cache data amount reaches the threshold, the data is flushed onto hard disks. This policy enables high write performance.
LUN write through: Data is directly written to hard disks. This policy is of slow write performance.