https://community.cloudera.com/t5/Archives-of-Support-Questions/Is-it-ok-to-deploy-Master-services-in-HA-mode-but-without/m-p/95316#M8683 <P>One of the partner I am working with do not want to use RAID on master nodes. </P><P>They are looking for some answers to below questions. </P><P>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++</P><P>1) Do you think we can rely on HA for handling service interruptions due to disk failures</P><P>2) Will HA failover kick if the drive that has the mount for service configuration files (XML files) fail</P><P>3) Will HA failover kick if the drive that has the mount for log files fails</P><P>4) If a service uses local storage for metastore, will HA failover kick if the drive that has the mount for metastore fails.</P><P>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++</P><P>What is your opinion on these?</P><P> <A rel="user" href="https://community.cloudera.com/users/381/cnauroth.html" nodeid="381">@Chris Nauroth</A> , <A rel="user" href="https://community.cloudera.com/users/137/sdutta.html" nodeid="137">@sdutta@hortonworks.com</A>, <A rel="user" href="https://community.cloudera.com/users/276/vnair.html" nodeid="276">@vnair@hortonworks.com</A></P> Wed, 14 Oct 2015 01:06:59 GMT VSomani 2015-10-14T01:06:59Z https://community.cloudera.com/t5/Archives-of-Support-Questions/Is-it-ok-to-deploy-Master-services-in-HA-mode-but-without/m-p/95316#M8683 <P>One of the partner I am working with do not want to use RAID on master nodes. </P><P>They are looking for some answers to below questions. </P><P>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++</P><P>1) Do you think we can rely on HA for handling service interruptions due to disk failures</P><P>2) Will HA failover kick if the drive that has the mount for service configuration files (XML files) fail</P><P>3) Will HA failover kick if the drive that has the mount for log files fails</P><P>4) If a service uses local storage for metastore, will HA failover kick if the drive that has the mount for metastore fails.</P><P>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++</P><P>What is your opinion on these?</P><P> <A rel="user" href="https://community.cloudera.com/users/381/cnauroth.html" nodeid="381">@Chris Nauroth</A> , <A rel="user" href="https://community.cloudera.com/users/137/sdutta.html" nodeid="137">@sdutta@hortonworks.com</A>, <A rel="user" href="https://community.cloudera.com/users/276/vnair.html" nodeid="276">@vnair@hortonworks.com</A></P> Wed, 14 Oct 2015 01:06:59 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/Is-it-ok-to-deploy-Master-services-in-HA-mode-but-without/m-p/95316#M8683 VSomani 2015-10-14T01:06:59Z https://community.cloudera.com/t5/Archives-of-Support-Questions/Is-it-ok-to-deploy-Master-services-in-HA-mode-but-without/m-p/95317#M8684 <P>This is a bad idea and will be flagged during an architecture review. Master servers must have RAID for production deployments, and we recommend RAID 5 or, more often, 10.</P><P>No amount of software HA and failover will address a situation when an OS or primary disk is lost if care wasn't taken of the data in advance. Imagine if HA was a solid solution, but client configuration for the HA mode was saved on a disk which failed, without any replica or a redundant drive.</P><P>Master nodes must have RAID arrays for production.</P> Wed, 14 Oct 2015 02:02:48 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/Is-it-ok-to-deploy-Master-services-in-HA-mode-but-without/m-p/95317#M8684 andrewg 2015-10-14T02:02:48Z