Using a single directory will make be the most efficient use of space, multi directories are useful when you accidentally run out of space http://www.mail-archive.com/user@cassandra.apache.org/msg07874.html
Can you put the SSD's in a stripe set ? Also this may be of interest http://www.bitplumber.net/2010/10/a-cassandra-hardware-stack-dell-c1100s-ocz-vertex-2-ssds-with-sandforce-arista-7048s/ Aaron On 4 Apr 2011, at 02:32, Anurag Gujral wrote: > Now it is using all the three disks . I want to understand why recommended > approach is to use > one single large volume /directory and not multiple ones,can you please > explain in detail. > I am using SSDs using three small ones is cheaper than using one large one. > Please Suggest > Thanks > Anurag > > On Sun, Apr 3, 2011 at 7:31 AM, aaron morton <aa...@thelastpickle.com> wrote: > Is this still a problem ? Are you getting errors on the server ? > > It should be choosing the directory with the most space. > > btw, the recommended approach is to use a single large volume/directory for > the data. > > Aaron > > On 2 Apr 2011, at 01:56, Anurag Gujral wrote: > > > Hi All, > > I have setup a cassandra cluster with three data directories but > > cassandra is using only one of them and that disk is out of space > > and .Why is cassandra not using all the three data directories. > > > > Plz Suggest. > > > > Thanks > > Anurag > >
