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From Yabin Meng <>
Subject Re: Adding disk capacity to a running node
Date Mon, 17 Oct 2016 16:42:29 GMT
I assume you're talking about Cassandra JBOD (just a bunch of disk) setup
because you do mention it as adding it to the list of data directories. If
this is the case, you may run into issues, depending on your C* version.
Check this out:

Or another approach is to use LVM to manage multiple devices into a single
mount point. If you do so, from what Cassandra can see is just simply
increased disk storage space and there should should have no problem.

Hope this helps,


On Mon, Oct 17, 2016 at 11:54 AM, Vladimir Yudovin <>

> Yes, Cassandra should keep percent of disk usage equal for all disk.
> Compaction process and SSTable flushes will use new disk to distribute both
> new and existing data.
> Best regards, Vladimir Yudovin,
> *Winguzone <> - Hosted Cloud Cassandra on
> Azure and SoftLayer.Launch your cluster in minutes.*
> ---- On Mon, 17 Oct 2016 11:43:27 -0400*Seth Edwards <
> <>>* wrote ----
> We have a few nodes that are running out of disk capacity at the moment
> and instead of adding more nodes to the cluster, we would like to add
> another disk to the server and add it to the list of data directories. My
> question, is, will Cassandra use the new disk for compactions on sstables
> that already exist in the primary directory?
> Thanks!

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