Hi all   I am trying both CDH and VirtualBox for the first time so apologies in advance if this is a basic error.  My configuration is as follows:   CDH 5.5 QuickStart VM VirtualBox 5.0.12 OS X 10.11.2 MacBook Pro (Retina, 13-inch, Early 2015) Memory: 8 GB   I have successfully installed VirtualBox and downloaded the QuickStart VM.  When creating a new VM for CDH 5.5, I use the following options in VirtualBox:   Type: Linux Version: Other Linux (64-bit) Memory: 4096 MB (I am aware that I ought to use more but I lack memory on my laptop and don't believe that this is the cause of my problem) Hard disk: "Use an existing virtual hard disk file" (I select the downloaded cloudera-quickstart-vm-5.5.0-0-virtualbox-disk1.vmdk file)   Then, when I try to start the VM, I see a large number of read-only filesystem errors and most services fail to start, e.g.   touch: cannot touch '/var/lock/subsys/atd': Read-only file system   A few services do start, e.g. Impala Server (impalad).   All of the filesystem errors appear to refer to the /var filesystem.   As per the instructions at http://www.cloudera.com/content/www/en-us/downloads/quickstart_vms/5-5.html, I have tried the following but with no effect:   "Some users have reported problems running CentOS 6.4 in VirtualBox. If a kernel panic occurs while the VirtualBox VM is booting, you can try working around this problem by opening the Settings > System > Motherboard tab, and selecting ICH9 instead of PIIX3 for the chip set. If you have not already done so, you must also enable I/O APIC on the same tab."   That's not surprising since my issue is the /var read-only filesystem, not a kernel panic.   Thanks in advance for any advice.   Kevin ... View more