Customer had observed that 12 to 13 TB is available in the morning ,but after about 12 hours, they had found that only 3 TB storage is available. Even though customer didn't make many provisions today but observed that storage had fluctuated a lot.
The version is HCS 18.104.22.168.
The change amount of data is related with 3 operations: write/delete/modify.
In 20190709, from 9:30am to 21:30, the average write bandwidth is 107.02MB/s in controller A, and in controller B the write bandwidth is 116.81MB/s.
It means, in 12 hours there are
9.22TB written into the storage. 4.409088134765625 TB(=107.02MB/s *
3600 s *12 hours) + 4.812423706054688 TB (=116.81MB/s * 3600 s *12 hours
Because there are snapshots, although the upper layer hosts delete/modify some data, the old data will be still in the storage space.
That is why “We had observed that 12 to 13 TB is available today morning & now we had found that only 3 TB storage is available”.
customer wrote much data into storage, not huawei product problem.
we do not know how much data the end users write. so only way is to check the storage performance data.