Hi Bob, Ambari is filtering some mount point has being not valid places and /home is one of them. BTW, I’ve notice that you are use LVM – it’s recommended to not use LVM for hadoop data disk ( it adds a unnecessary overhead ) not a big deal if it’s just a play cluster.
Given that you are using LVM, you could take a backup of everything under /home destroy the LV and create a smaller one for home and a big one for hadoop. Stop your cluster # tar cvf home_backup.tar /home/* # umount /home # lvremove /dev/mapper/centos-home # lvcreate –L +10G –n home centos # mkfs.ext4 /dev/mapper/centos-home # lvcreate –L +2.5T –n hadoop centos # mkfs.ext4 /dev/mapper/centos-hadoop # mount /dev/mapper/centos-home /home # mount /dev/mapper/centos-hadoop /mnt # cp –ax /hadoop/* /mnt/ # umount /mnt # mount /dev/mapper/centos-hadoop /hadoop # tar xvf home_backup.tar –C /home Restart your cluster, check that it’s working – if it does, you should umount /hadoop and clean the folder underneath and then remount. Do not forget to also edit your /etc/fstab to get /hadoop mounted automatically at boot. Thanks Olivier From: "Adaryl Wakefield, MBA Bob" <adaryl.wakefi...@hotmail.com<mailto:adaryl.wakefi...@hotmail.com>> Reply-To: "user@ambari.apache.org<mailto:user@ambari.apache.org>" <user@ambari.apache.org<mailto:user@ambari.apache.org>> Date: Wednesday, 4 November 2015 at 23:02 To: "user@ambari.apache.org<mailto:user@ambari.apache.org>" <user@ambari.apache.org<mailto:user@ambari.apache.org>> Subject: Re: HDFS disk usage I’ve been advised to place the data in a directory that is in /home. I attempted to do that an got an error that said dfs.datanode.data.dir can’t be set to anything in the /home directory. Adaryl "Bob" Wakefield, MBA Principal Mass Street Analytics, LLC 913.938.6685 www.linkedin.com/in/bobwakefieldmba Twitter: @BobLovesData From: Adaryl "Bob" Wakefield, MBA<mailto:adaryl.wakefi...@hotmail.com> Sent: Wednesday, November 04, 2015 2:18 PM To: user@ambari.apache.org<mailto:user@ambari.apache.org> Subject: Re: HDFS disk usage I dug into this a little bit more. Apparently the default is 50GB. On my datanodes, I ran df –hl. This is the output Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 50G 12G 39G 23% / devtmpfs 16G 0 16G 0% /dev tmpfs 16G 0 16G 0% /dev/shm tmpfs 16G 1.4G 15G 9% /run tmpfs 16G 0 16G 0% /sys/fs/cgroup /dev/sda2 494M 123M 372M 25% /boot /dev/mapper/centos-home 2.7T 33M 2.7T 1% /home If I’m reading this right it HAS to be mounted correctly because no other mount points have enough space correct? Adaryl "Bob" Wakefield, MBA Principal Mass Street Analytics, LLC 913.938.6685 www.linkedin.com/in/bobwakefieldmba Twitter: @BobLovesData From: Adaryl "Bob" Wakefield, MBA<mailto:adaryl.wakefi...@hotmail.com> Sent: Tuesday, November 03, 2015 10:32 AM To: user@ambari.apache.org<mailto:user@ambari.apache.org> Subject: Re: HDFS disk usage How would I go about doing that? Adaryl "Bob" Wakefield, MBA Principal Mass Street Analytics, LLC 913.938.6685 www.linkedin.com/in/bobwakefieldmba Twitter: @BobLovesData From: Olivier Renault<mailto:orena...@hortonworks.com> Sent: Tuesday, November 03, 2015 3:49 AM To: user@ambari.apache.org<mailto:user@ambari.apache.org> ; user@ambari.apache.org<mailto:user@ambari.apache.org> Subject: Re: HDFS disk usage Could you double check that your datanodes are using the correct mount point? Thanks, Olivier ------ Olivier Renault Solution Engineer Mobile: +44 7500 933 036 On Tue, Nov 3, 2015 at 1:45 AM -0800, "Adaryl "Bob" Wakefield, MBA" <adaryl.wakefi...@hotmail.com<mailto:adaryl.wakefi...@hotmail.com>> wrote: Why is there such a large discrepancy between what is reported and my actual disk size? B. From: Olivier Renault<mailto:orena...@hortonworks.com> Sent: Tuesday, November 03, 2015 3:01 AM To: user@ambari.apache.org<mailto:user@ambari.apache.org> ; user@ambari.apache.org<mailto:user@ambari.apache.org> Subject: Re: HDFS disk usage It reports the space available for HDFS. Thanks, Olivier On Mon, Nov 2, 2015 at 11:57 PM -0800, "Adaryl "Bob" Wakefield, MBA" <adaryl.wakefi...@hotmail.com<mailto:adaryl.wakefi...@hotmail.com>> wrote: On the dashboard, what exactly is HDFS disk usage reporting? The numbers I’m seeing are WAY less than the total disk space on my cluster. B.
