DMX-4 Interview Questions

DMX-4 Interview Questions

·         What is the difference between DMX-3 and DMX-4?
·         What is the difference between DMX-4 and DMX-950?
·         How many Cache directors, Front-end directors and Back-end directors we can use in DMX-4?
·         What are the different types of Front-end directors and the purpose of each one?
·         What is the FAN-IN and FAN-OUT ratio of DMX-4?
·         Explain Rule 17 in DMX?
·         What are the Management Tools for DMX?
·         What are the major components of System Bay and Storage Bay?
·         Explain Enginuity Operation layers
·         How do you calculate number of cylinders for 50GB LUN?
·         What is the maximum hyper size in DMX-4?
·         How many hypers can create in a Single disk?
·         How many members can contain in one meta?
·         How many LUN IDs available per port?
·         What Dynamic LUN addressing?
·         How do you add a new member to the existing Meta?
·         What is stripping and what is Concatenating?
·         What are the DMX-4 supported disk types, no. of disks and maximum capacity?
·         Briefly explain the DMX-4 supported Device types?
·         What are the RAID levels DMX-4 Supports?
·         What are Vault drives and Hot Spare?
·         What is Preview, Prepare and Commit while using Symconfigure command?
·         How do you check the back-end Operations on Symmetrix Array?
·         How do you check the failed disks in the Symmetrix Array?
·         What are the service states of a device
·         How do you reserve the devices?
·         What is Tiering and how do you create the Disk Groups
·         How do you check the free space by Disk group and Array as whole?
·         How do you check the particular disk is connected to which DA Port and it is resides in particular DAE?
·         What is drive looping?
·         How do you check the particular device is connected to which Host?
·         How do you check the total allocated storage of a Host?
·         Host is unable to see the storage, what may be the problem?
·         What is VCMDB and How do you take the backup?
·         How do you list the Hosts which are connected to particular director port?
·         How do you check the number of storage bays connected to the system bay and number of disks in each storage bay?
·         How do you check the devices which are mapped to FA but not masked to any host?
·         How do you check the login hosts in the Array?
·         What is pre check list to assign to storage to the host?
·         Explain step by step to provide storage to the Host?
·         What is Thin Provisioning?
·         How do you create thin pools and thin devices?
·         What are the steps for storage reclamation?
·         How many mirror positions RAID-1 and RAID-5 will occupy?
·         How do you increase the mirror positions?
·         How do you convert the One device type to another?
·         What is FA Port Flag and how do you set the FA port flags?
·         How do you setup the Symmetrix metrics?
·         How do you check the configured environmental variables?
·         Can windows, Linux, Solaris share the same FA in DMX?
·         What are the External locks and how to check?
·         How to monitor performance of EMC Symmetrix?
·         How do you check performance statistics of a particular director port?
·         How do you check the cache activity of selected front-end directory?
·         How do you check the back-end I/O requests of selected disk?
·         What are the available performance information types in SYMSTAT command?
·         What is symmetrix optimizer and how it works?
·         What is Symmetrix QoS and how it works?
·         What is the purpose of Symmetrix Change Tracker?
·         What is Dynamic Cache Partitioning?
·         What are the logs available at host-end and on symmetrix array?
·         How do you monitor the real time events on symmetrix array with example?
·         How do you track the history of events on symmetrix array with example?
·         How do you check the audit logs on symmetrix array?
·         How do you activate the auditing on symmetrix array?
·         What is Symmetrix ACL?
·         Explain step by step to setup the access controls on symmetrix array?
·         How do you take the backup of ACLs?
·         What is Symmetrix User Authorization?
·         Explain step by step to setup user authorization on symmetrix array?
·         How do you perform backup and restore user authorization information?
·         What is Read Hit and Write Miss?
·         What is the purpose of bin file in SAPAPI database?
·         What are the services of symcli?
·         Explain step by step procedure to setup new host?
·         What are the Symcli Base Management Commands?
·         How do you prepare the Storage Capacity planning reports by host wise?
·         What are the Symmetrix Business Continuity Tool
·         By using what symcli command we can check the HBA details and physical details
·         What are the business continuity tools for symmetrix array?
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