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From Mirko Kämpf <mirko.kae...@gmail.com>
Subject Re: Need to evaluate a cluster
Date Thu, 10 Jul 2014 09:00:43 GMT
I multiply by 1.3 which means I add 30% of the estimated amount to have
reserved capacity for intermediate data.
In your case with approx. 2TB per day I think, data nodes with 1 to 3 discs
are not a good idea. You should consider servers with more discs and than
add one per week. Start with 10 servers and 12 HDD (3TB) per server. This
allows you to handle approx. 35 TB raw uncompressed data. You have to
evaluated compression in your special case. It can be high, but also not
very high, if raw data is already compressed somehow. What data are you
dealing with?
Text, messages, logs or more binary data like images, mp3 oder video
formats?

Cheers,
Mirko



2014-07-10 10:43 GMT+02:00 YIMEN YIMGA Gael <gael.yimen-yimga@sgcib.com>:

> Hi,
>
>
>
> What does « 1.3 for overhead » mean in this calculation ?
>
>
>
> Regards
>
>
>
> *From:* Mirko Kämpf [mailto:mirko.kaempf@gmail.com]
> *Sent:* Wednesday 9 July 2014 18:09
>
> *To:* user@hadoop.apache.org
> *Subject:* Re: Need to evaluate a cluster
>
>
>
> Hello,
>
>
>
> if I follow your numbers I see one missing fact: *What is the number of
> HDDs per DataNode*?
>
> Let's assume you use machines with 6 x 3TB HDDs per box, you would need
> about 60 DataNodes
>
> per year (0.75 TB per day x 3 for replication x 1.3 for overhead / ( nr of
> HDDs per node x capacity per HDD )).
> With 12 HDD you would only need 30 servers per year.
> How did you calculate the number of 367 datanodes?
>
>
>
> Cheers,
>
> Mirko
>
>
>
> 2014-07-09 17:59 GMT+02:00 YIMEN YIMGA Gael <gael.yimen-yimga@sgcib.com>:
>
> Hello Dear,
>
>
>
> I made an estimation of a number of nodes of a cluster that can be
> supplied by 720GB of data/day.
>
> My estimation gave me *367 datanodes* in a year. I’m a bit afraid by that
> amount of datanodes.
>
> The assumptions, I used are the followings :
>
>
>
> -          Daily supply (feed) : 720GB
>
> -          HDFS replication factor: 3
>
> -          Booked space for each disk outside HDFS: 30%
>
> -          Size of a disk: 3TB.
>
>
>
> I have two questions.
>
>
>
> First, I would like to know if my assumptions are well taken?
>
> Secondly, could someone help me to evaluate that cluster, to let me be
> sure that my results are not to excessive, please ?
>
>
>
> Standing by for your feedback
>
>
>
> Warm regard
>
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