Re: StarCluster not mounting EBS volume correctly

From: Dan Tenenbaum <no email>
Date: Wed, 27 Oct 2010 12:49:09 -0700

Hi Justin,

Thanks for your response. Please see my later email; createvolume is not
working for me.

Also note the following error in the page you sent me the link to:


This will leave the host instance running with the new volume attached. You
can then login to the host instance using:

$ starcluster createvolume 20 us-east-1c


Is there a way around the problem I was having with createvolume? Or should
I follow the procedures you list for creating a volume manually?

Dan



On Wed, Oct 27, 2010 at 12:44 PM, Justin Riley <jtriley_at_mit.edu> wrote:

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> Hi Dan,
>
> The 0.91 version of StarCluster assumes the volumes are partitioned with
> a single partition. I know now that it's best *not* to partition the
> drives but rather just format the raw disk. Unfortunately for now using
> partitioned EBS vols will have to do.
>
> I'm currently working on updating the code to support both partitioned
> and unpartitioned vols along with a slew of other fixes and enhancements
> but in the mean time I would recommend using StarCluster's createvolume
> command to create, format, and partition a new EBS volume for use with
> StarCluster:
>
> http://web.mit.edu/stardev/cluster/docs/volumes.html
>
> HTH,
>
> ~Justin
>
> On 10/27/2010 03:29 PM, Dan Tenenbaum wrote:
> > Hi all,
> >
> > I created a 30GB EBS volume, formatted it with the ext3 filesystem, and
> > detached it.
> >
> > Then I set my cluster config to use this volume.
> >
> > VOLUMES = sharedhome
> > ...
> > [volume sharedhome]
> > VOLUME_ID = vol-70e6f719
> > MOUNT_PATH = /home
> >
> > I start my cluster and see the following output:
> >
> >>>> Waiting for cluster to start.../>>> The master node is
> > ec2-184-73-92-19.compute-1.amazonaws.com
> > <http://ec2-184-73-92-19.compute-1.amazonaws.com>
> >>>> Attaching volume vol-70e6f719 to master node on /dev/sdz ...
> >
> >>>> Setting up the cluster...
> >>>> Mounting EBS volume vol-70e6f719 on /home...
> > ssh.py:77 - WARNING - specified key does not end in either rsa or dsa,
> > trying both
> >>>> Using private key /Users/dtenenba/.ec2/bioc-keypair.pem (rsa)
> > clustersetup.py:201 - WARNING - Cannot find partition /dev/sdz1 on
> > volume vol-70e6f719
> > clustersetup.py:203 - WARNING - Not mounting vol-70e6f719 on /home
> > clustersetup.py:206 - WARNING - This either means that the volume has
> > not beenpartitioned or that the partition specifieddoes not exist on the
> > volume
> >
> > I formatted my volume according to these instructions:
> > https://learningspaces.njit.edu/content/how-format-and-mount-ebs-volume
> > Was there something else I need to do? How do I put a named partition
> > such as /dev/sdz1 on the volume?
> > BTW, I don't want to partition the volume, but I want to use the whole
> > thing.
> >
> > I have set up volumes before using this procedure and not run into any
> > problems.
> >
> > BTW, after I ssh into the master, and do fdisk /dev/sdz, I see this:
> > # fdisk /dev/sdz
> > Device contains neither a valid DOS partition table, nor Sun, SGI or OSF
> > disklabel
> > Building a new DOS disklabel with disk identifier 0x5cde0278.
> > Changes will remain in memory only, until you decide to write them.
> > After that, of course, the previous content won't be recoverable.
> >
> >
> > The number of cylinders for this disk is set to 3916.
> > There is nothing wrong with that, but this is larger than 1024,
> > and could in certain setups cause problems with:
> > 1) software that runs at boot time (e.g., old versions of LILO)
> > 2) booting and partitioning software from other OSs
> > (e.g., DOS FDISK, OS/2 FDISK)
> > Warning: invalid flag 0x0000 of partition table 4 will be corrected by
> > w(rite)
> >
> > Not sure if that is relevant or not.
> >
> > Please let me know how I am supposed to configure the volume. Thanks
> >
> > Dan
> >
>
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Received on Wed Oct 27 2010 - 15:49:13 EDT