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From Bèrto ëd Sèra <berto.d.s...@gmail.com>
Subject Re: Cassandra Disk storage capacity
Date Mon, 07 Apr 2014 11:45:22 GMT
I guess there is a misunderstanding here:
>I am confused why cassandra uses the entire disk space ( / Directory) even
when we specify /var/lib/cassandra/data as the directory in Cassandra.yaml
file

C* will use the entire MOUNTPOINT, which is not necessarily your entire
total disk space. If you have a separate mountpoint for /var/lib/cassandra/data
it is my understanding that C* will fill that, to the best of my knowledge.
You still have stuff located outside of it, though. Like logs, to begin
with.

Cheers
Bèrto




On 7 April 2014 12:24, Hari Rajendhran <hari.rajendhran@tcs.com> wrote:

> Hi,
>
> Thanks for the update
>
> Still i have few queries which needs to be clarified
>
> 1) I am confused why cassandra uses the entire disk space ( / Directory)
> even when we specify /var/lib/cassandra/data as the directory in
> Cassandra.yaml file
> 2) Is it only during compaction ,cassandra will use the entire Disk space ?
> 3) What is the best way to monitor the cassandra Disk usage ?? is there a
> opensource monitoring tool for this ??
>
>
>
> Best Regards
> Hari Krishnan Rajendhran
> Hadoop Admin
> DESS-ABIM ,Chennai BIGDATA Galaxy
> Tata Consultancy Services
> Cell:- 9677985515
> Mailto: hari.rajendhran@tcs.com
> Website: http://www.tcs.com
> ____________________________________________
> Experience certainty. IT Services
> Business Solutions
> Consulting
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> -----Jan Kesten <j.kesten@enercast.de> wrote: -----
>
> To: user@cassandra.apache.org
> From: Jan Kesten <j.kesten@enercast.de>
> Date: 04/07/2014 04:41PM
> Subject: Re: Cassandra Disk storage capacity
>
>
> Hi Hari,
>
> C* will use your entire space - that is something one should monitor.
> Depending on your choose on compaction strategy your data_dir should not be
> filled up entirely - in the worst case compaction will need space as large
> as the sstables on disk, therefore 50% should be free space.
>
> The parameters used for on disk storage are commitlog_directory and
> data_file_directories and saved_caches_directory. The paramter
> data_file_directories is in plural, you can easily put more than one
> directory here (and you should do this instead of using RAID).
>
> Cheers,
> Jan
>
> Am 07.04.2014 12:56, schrieb Hari Rajendhran:
>
> Hi Team,
>
>  We have a 3 node Apache cassandra 2.0.4 setup installed in our lab
> setup.We have set data directory to /var/lib/cassandra/data.What would be
> the maximum
> disk storage that will be used for cassandra data storage.
>
>  Note : /var partition has a storage capacity of 40GB.
>
>  My question is whether cassandra will  the entire / directory for data
> storage ?
> If no, how to specify multiple directories for data storage ??
>
>
>
>
>
> Best Regards
> Hari Krishnan Rajendhran
> Hadoop Admin
> DESS-ABIM ,Chennai BIGDATA Galaxy
> Tata Consultancy Services
> Cell:- 9677985515
> Mailto: hari.rajendhran@tcs.com
> Website: http://www.tcs.com
> ____________________________________________
> Experience certainty. IT Services
> Business Solutions
> Consulting
> ____________________________________________
>
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