Re: StarCluster not mounting EBS volume correctly

From: Justin Riley <no email>
Date: Wed, 27 Oct 2010 15:44:59 -0400

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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 - 15:45:01 EDT