The auto_snapshot setting is disabled. And the directory architecture on the 
five nodes will match exactly.

 (Cassandra/Server shutdown -> Mount disk -> Add directory to 
data_file_directories -> Start Cassandra) * 5 rolling

Is it possible to add disks without losing data by doing the above procedure?



> On 7 Mar 2018, at 7:59 PM, Rahul Singh <rahul.xavier.si...@gmail.com> wrote:
> 
> Are you putting both the commitlogs and the Sstables on the adds? Consider 
> moving your snapshots often if that’s also taking up space. Maybe able to 
> save some space before you add drives.
> 
> You should be able to add these new drives and mount them without an issue. 
> Try to avoid different number of data dirs across nodes. It makes automation 
> of operational processes a little harder.
> 
> As an aside, Depending on your usecase you may not want to have a data 
> density over 1.5 TB per node.
> 
> --
> Rahul Singh
> rahul.si...@anant.us
> 
> Anant Corporation
> 
> On Mar 7, 2018, 1:26 AM -0500, Eunsu Kim <eunsu.bil...@gmail.com>, wrote:
>> Hello,
>> 
>> I use 5 nodes to create a cluster of Cassandra. (SSD 1TB)
>> 
>> I'm trying to mount an additional disk(SSD 1TB) on each node because each 
>> disk usage growth rate is higher than I expected. Then I will add the the 
>> directory to data_file_directories in cassanra.yaml
>> 
>> Can I get advice from who have experienced this situation?
>> If we go through the above steps one by one, will we be able to complete the 
>> upgrade without losing data?
>> The replication strategy is SimpleStrategy, RF 2.
>> 
>> Thank you in advance
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