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From John Sanda <john.sa...@gmail.com>
Subject Re: calculating sizes on disk
Date Fri, 06 Dec 2013 20:53:59 GMT
I have done that, but it only gets me so far because the cluster and app
that manages it is run by 3rd parties. Ideally, I would like to provide my
end users with a formula or heuristic for establishing some sort of
baselines that at least gives them a general idea for planning. Generating
data as you have suggested and as I have done is helpful, but it is hard
for users to extrapolate out from that.


On Fri, Dec 6, 2013 at 3:47 PM, Jacob Rhoden <jacob.rhoden@me.com> wrote:

> Not sure what your end setup will be, but I would probably just spin up a
> cluster and fill it with typical data to and measure the size on disk.
>
> ______________________________
> Sent from iPhone
>
> On 7 Dec 2013, at 6:08 am, John Sanda <john.sanda@gmail.com> wrote:
>
> I am trying to do some disk capacity planning. I have been referring the
> datastax docs[1] and this older blog post[2]. I have a column family with
> the following,
>
> row key - 4 bytes
> column name - 8 bytes
> column value - 8 bytes
> max number of non-deleted columns per row - 20160
>
> Is there an effective way to calculate the sizes (or at least a decent
> approximation) of the bloom filters and partition indexes on disk?
>
> [1] Calculating user data size<http://www.datastax.com/documentation/cassandra/1.2/webhelp/index.html?pagename=docs&version=1.2&file=index#cassandra/architecture/../../cassandra/architecture/architecturePlanningUserData_t.html>
> [2] Cassandra Storage Sizing <http://btoddb-cass-storage.blogspot.com/>
>
> --
>
> - John
>
>


-- 

- John

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