question Re: HDFS block storage clarification in Archives of Support Questions (Read Only)

HDFS block storage clarification

vamsi123 — Tue, 21 Apr 2026 12:27:01 GMT

If a file of size 10 MB is copied on to HDFS of block size 256 MB, then how much storage will be allocated to the file on HDFS ? Let us assume replication factor is 3 so it will occupy (256 MB)*3 on HDFS.Please correct me if i am wrong?

Re: HDFS block storage clarification

rajkumar_singh — Tue, 15 Nov 2016 21:30:31 GMT

no it will occupy 3*10 = 30M on hdfs,HDFS capacity is consumed based on the actual file size but a block is consumed per file

Re: HDFS block storage clarification

vamsi123 — Tue, 15 Nov 2016 22:01:25 GMT

ok.In that case 768(256*3)-30=738MB is used for other files or is it waste of memory?

Re: HDFS block storage clarification

rajkumar_singh — Tue, 15 Nov 2016 23:27:25 GMT

@vamsi valiveti rest of the memory is used by other files.