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From Jan Kesten <>
Subject Re: Cassandra Disk storage capacity
Date Mon, 07 Apr 2014 11:10:41 GMT
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).


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
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