[StarCluster] need scratch space

[Jennifer Staab]

Submit command "lsblk" and you will see the instance/ephemeral storage.  
In my experience the instance/ephemeral storage will be smaller in size 
( for me 40 GB is typically 37.5/37 GB in size) and usually one disk is 
automatically mounted as "/mnt".  Seems like in your case it is likely 
"/dev/xvdaa" is one of the instance/ephemeral disks.  If you don't see 
the other with "lsblk" command, it is likely when you created the EC2 
you forgot to indicate you wanted to use both instance storage disks 
when you added storage to your EC2.

Good Luck.

- Jennifer

On 12/9/14 9:48 AM, Jin Yu wrote:
> You can use these two 40G SSD to make a raid0 volume of 80G, and then 
> mount it to /scratch.
>
> -Jin
>
> On Mon, Dec 8, 2014 at 1:55 PM, Jian Feng <freedafeng at yahoo.com 
> <mailto:freedafeng at yahoo.com>> wrote:
>
>     Dear starcluster community,
>
>     I created an ec2 cluster using m3.xlarge instance (2*40GB SSD). I
>     did not see any scratch space or /scratch folder at all. Here is
>     the disk space layout.
>
>     root at node001:~# df -h
>     Filesystem    Size  Used Avail Use% Mounted on
>     /dev/xvda1     20G  5.6G   14G  30% /
>     udev    7.4G  8.0K  7.4G   1% /dev
>     tmpfs     3.0G  176K  3.0G   1% /run
>     none    5.0M     0  5.0M   0% /run/lock
>     none    7.4G     0  7.4G   0% /run/shm
>     /dev/xvdaa     37G  177M   35G   1% /mnt
>     master:/home     20G  5.6G   14G  30% /home
>     master:/opt/sge6   20G  5.6G   14G  30% /opt/sge6
>
>     In my application, I need a scatch folder on each node that has
>     about 50G space. Is there a way to do that? I don't really need
>     /home or /opt/sge6 stuff. And I don't run mpi applications.
>
>     Maybe I should recreate an AMI?
>
>     Thanks!
>
>
>
>
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