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.rajendh...@tcs.com Website: http://www.tcs.com ____________________________________________ Experience certainty. IT Services Business Solutions Consulting ____________________________________________ -----Jan Kesten <j.kes...@enercast.de> wrote: ----- To: user@cassandra.apache.org From: Jan Kesten <j.kes...@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.rajendh...@tcs.com Website: http://www.tcs.com ____________________________________________ Experience certainty. IT Services Business Solutions Consulting ____________________________________________ =====-----=====-----===== Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you -- Jan Kesten, mailto:j.kes...@enercast.de Tel.: +49 561/4739664-0 FAX: -9 enercast GmbH Friedrich-Ebert-Str. 104 D-34119 Kassel HRB15471 http://www.enercast.de Online-Prognosen für erneuerbare Energien Geschäftsführung: Dipl. Ing. Thomas Landgraf, Bernd Kratz Diese E-Mail und etwaige Anhänge können vertrauliche und/oder rechtlich geschützte Informationen enthalten. Falls Sie nicht der angegebene Empfänger sind oder falls diese E-Mail irrtümlich an Sie adressiert wurde, benachrichtigen Sie uns bitte sofort durch Antwort-E-Mail und löschen Sie diese E-Mail nebst etwaigen Anlagen von Ihrem System. Ebenso dürfen Sie diese E-Mail oder ihre Anlagen nicht kopieren oder an Dritte weitergeben. Vielen Dank. This e-mail and any attachment may contain confidential and/or privileged information. If you are not the named addressee or if this transmission has been addressed to you in error, please notify us immediately by reply e-mail and then delete this e-mail and any attachment from your system. Please understand that you must not copy this e-mail or any attachment or disclose the contents to any other person. Thank you for your cooperation.
