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in 12 hours about 9TB space is used

Publication Date:  2019-08-15 Views:  164 Downloads:  0

Issue Description

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.

Handling Process

   The version is HCS 6.3.1.1.

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
)= 9.221511840820313TB.

  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.

Controller A:

Controller B:



Root Cause

customer wrote much data into storage, not huawei product problem.

Suggestions

we do not know how much data the end users write. so only way is to check the storage performance data.

END