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?