Also it worth noting, that usage of JBOD isn't recommended for older Cassandra 
versions, as there are known issues with data imbalance on JBOD.

iirc JBOD data imbalance was fixed in some 3.x version (3.2?)

For older versions creation one large filesystem on top md or lvm device seems 
to be a better choice.

From: Eunsu Kim <>
Sent: Tuesday, June 12, 2018 9:06:07 AM
Subject: Re: What will happen after adding another data disk

In my experience, adding a new disk and restarting the Cassandra process slowly 
distributes the disk usage evenly, so that existing disks have less disk usage

On 12 Jun 2018, at 11:09 AM,<> 

I know Cassandra can make use of multiple disks. My data disk is almost full 
and I want to add another 2TB disk. I don't know what will happen after the 
1. C* will write to both disks util the old disk is full?
2. And what will happen after the old one is full? Will C* stop writing to the 
old one and only writing to the new one with free space?


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