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From arun sirimalla <arunsi...@gmail.com>
Subject Re: calculation of disk size
Date Thu, 30 Apr 2015 04:53:10 GMT
Hi Rahul,

If you are expecting 15 GB of data per day, here is the calculation.

1 Day = 15 GB, 1 Month = 450 GB, 1 Year = 5.4 TB, so your raw data size for
one year is 5.4 TB with replication factor of 3 it would be around 16.2 TB
of data for one year.

Taking compaction into consideration and your use case being write heavy,
if you go with size tiered compaction. you would need twice the space of
your raw data.

So you would need around 32-34 TB of disk space.

Reference:
http://docs.datastax.com/en/cassandra/2.0/cassandra/architecture/architecturePlanningDiskCapacity_t.html

Thanks

On Wed, Apr 29, 2015 at 9:20 PM, Rahul Bhardwaj <
rahul.bhardwaj@indiamart.com> wrote:

> Hi All,
>
>
> We are planning to set up a cluster of 5 nodes with RF 3 for write heavy
> project, our current database size is around 500 GB. And it is growing at
> rate of 15 GB every day. We learnt that cassandra consumes space for
> compaction processes, So how can we calculate the amount of disk space we
> would require.
>
> Kindly suggest.
>
>
>
> Regards:
> Rahul Bhardwaj
>
>
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-- 
Arun
Senior Hadoop/Cassandra Engineer
Cloudwick

Champion of Big Data (Cloudera)
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