Dmx

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?

VCM Database

The Symmetrix Volume Configuration Management (VCM) database stores access configurations that are used to grant host access to logical devices in a Symmetrix storage array.

The VCM database resides on a special system resource logical device, referred to as the VCMDB device, on each Symmetrix storage array.

Information stored in the VCM database includes, but is not limited to:

Host and storage World Wide Names SID Lock and Volume Visibility settings Native logical device data, such as the front-end directors and storage ports to which they

are mapped

Masking operations performed on Symmetrix storage devices result in modifications to the VCM database in the Symmetrix array. The VCM database can be backed up, restored, initialized and activated. The Symmetrix SDM Agent must be running in order to perform VCM database operations (except deleting backup files).

Regarding the VCMDB, now this DB resides on the the two SFS (Symmetrix File System) volumes that are automatically created when binfile is build. You can identify them easily on bin. A small volume called still called VCM must still be created but it will be used just as a normal gatekeeper

· 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?

Common Interview Questions

· Tell me about your self?

· What are the day to day activities?

· What are your roles and responsibilities?

· What is the first thing you will do at office?

· What is your storage environment?

· What are the SAN, Storage and Replication management tools you are using?

· How you will monitor the Storage environment?

· How you will get the tickets?

· Explain step by step procedure to close the received ticket?

· When you initiate the change what are your responsibilities?

· Explain step by step procedure to close the received ticket?

SAN Interview Questions

· What is zoning?

· What is hard and soft zoning and Explain?

· What is the difference between zone and zone set?

· Explain step by step procedure for creating soft zoning?

· Explain step by step procedure for creating hard zoning?

· What is VSAN and how to create?

· What is ISL?

· What is F,E and FL Port?

· What are the management tools for Switches?

· How do you troubleshoot the SFP failure?

· How do you upgrade the firmware?

· What are the general switch problems?

TimeFinder Interview Questions

Define Business Continuity? What are the Business Continuity tools available for symmetrix? What is RPO and RTO? What are the different types of Device Groups? What is the difference between TimeFinder Mirror and Clone? What is the advantage of TimeFinder Snapshots? What are the commands used for TimeFinder Mirror, Clone and Snapshot? Explain step by step procedure for TimeFinder Mirror Operations? What is the status of Source and Target devices at the time of Establish, Split and

Restore? How many Mirrors can create with single source concurrently? What is default option while performing establish? What is Power path Split? What is ECA (Enginuity Consistent Assist) split? What are the precautions we have to take while restoring a mirror? What is Protected BCV Establish?

What is reverse split? What is Protected BCV Restore? How many BCVs can be supported in multi BCV functionality? How many BCVs can be Established concurrently to the standard volume/ Is TimeFinder Mirror Supports concurrent restores? Is the Mirror can be mounted to the source host? One device can be a member of how many device groups? Device Groups are host based or Array based? What is fore ground and back ground instant split? Explain Step by step procedure for TimeFinder Clone Operations? What are the available options with Clone Creation and Explain? What is the status of source and target devices while create, activate, restore and

terminate? Can we use STDs as a target for Clone? How many CopyOnAccess session clone will support? How many concurrent Full copied session clone will support? Clone session can use BCVs as a source volume? What will happen if we establish a clone session? Explain Step by step procedure for TimeFinder Snap Operations? How many snapshots can be created from a single source volume? How many save devices can contain in a save pool? What is the recommended size of VDEV? How do you create the SAVE and VDEVs? How do you monitor the free space in Save pool? How do restore the snapshots? How the data will be stored in save devices in a save pool?

Clariion Interview Questions

Explain Clariion architecture Hardware Models of Clariion What are the differences between Clariion CX-3 series and CX-4 Series What are the Hardware components of Clariion What are the management tools for Clariion How to Initialize Clariion Array What is Access Logix and How do you enable it? Why Access Logix has to be enabled What are Vault drives and how much capacity they use? What is CMI? Clariion Message Interface What are the I/O Operations in Clariion Use of SPs What is Storage array in Clariion? Create Storage group How to manually restore failed paths in Clariion How do you gather SP Collects? How do you upgrade the NaviSphere Manager? What are steps to assign a LUN to existing Host?

Explain step by step procedure for storage provision to the new host? How do create capacity planning reports in Clariion? What is HEAT report? How do you enter into the Engineering Mode and what are the activities we can perform

in Engineering Mode? How do you create a meta LUN? Explain step by step procedure for LUN migration? What is Private LUN Pool? What is Reserved LUN Pool? How do you deregister the hosts from NaviSphere? How do you create a user and assign access rights? How do you monitor Clariion alerts? What is the recommended ration of Read and Write cache?

DMX-4 Storage Provisioning Step by Step

Step by Step Procedure for storage provisioning & Reclamation in DMX-4

Storage Provisioning

Creating STD device Forming Meta Device Mapping Masking

Storage Reclamation

Unmasking Write Disable Un-mapping Dissolve meta Deleting hypers

Step by Step Procedure for storage provision in DMX-4

Creating STD device · Verify the Symmetrix status

symconfigure –sid 4282 verify

· If any hung activities found abort

symconfigure –sid 4282 abort

· Verify the available free space

symconfigure -sid SymmID [-v | -freespace [-units cylinders | MB]] list

or

symdisk –sid 4282 list –disk_group 2

· Create Command file

Create dev count=8, size=12394, data_member_count=3, emulation=FBA, config=RAID-5, disk_group=2;

· Verify the command line syntax by performing PREVIEW using Symconfigure command

Symconfigure –sid 4282 –f Create_hypers.txt –v –noprompt preview

· Verify the Array readiness by performing PREPARE using Symconfigure command

Symconfigure –sid 4282 –f Create_hypers.txt –v –noprompt prepare

· Execute COMMIT using Symconfigure command

Symconfigure –sid 4282 –f Create_hypers.txt –v –noprompt commit

· Verify the newly created devices

Symdev –sid 4282 list –noport

Forming Meta Device o Verify the Symmetrix status

symconfigure –sid 4282 verify

o If any hung activities found abort

symconfigure –sid 4282 abort

o Create Command file

Form meta from dev 26CA, config=striped, stripe_size=1920;

add dev 26CB:26E4 to meta 26ca;

o Verify the command line syntax by performing PREVIEW using Symconfigure ommand

Symconfigure –sid 4282 –f meta.txt –v –noprompt preview

o Verify the Array readiness by performing PREPARE using Symconfigure command

Symconfigure –sid 4282 –f meta.txt –v –noprompt prepare

o Execute COMMIT using Symconfigure command

Symconfigure –sid 4282 –f meta.txt –v –noprompt commit

o Verify the newly created meta devices


Mappping

· Find the host connected Director and Port details

symcfg –sid 4282 list –connections

o Find the available addresses on that port

symcfg –sid 4282 list –address –available –dir 7d –p 0

o Create a command file for mapping

map dev 26ca to dir 7d:0, lun=036;

o Verify the command line syntax by performing PREVIEW using

Symconfigure command

symconfigure –sid 4282 –f create_hypers.txt –v –nop preview

o Verify the Array readiness by performing PREPARE using

Symconfigure command

symconfigure –sid 4282 –f create_hypers.txt –v –nop prepare

o Execute COMMIT using Symconfigure command

symconfigure –sid 4282 –f create_hypers.txt –v –nop commit

o Check the device have been mapped

symcfg –sid 4282 list –address –available –dir 7d –p 0

Mappping

o Masking devices to the host

symmaskdb –sid 4282 –wwn 10000000c93f62cf –dir 7d –p 0 add devs 26ca –nop

Symmask –sid 4282 –refresh

o Check whether devices have masked

symmaskdb -sid 4282 list database -dir 7d -p 0

Step by Step Procedure for Storage Reclamation

Unmaskingo Unmasking devices from the host

symmaskdb –sid 4282 –www 10000000c93f62cf –dir 7d –p 0 remove devs 26ca

o Refresh the Symmetrix Array

Symmask –sid 4282 –refresh

Write Disableo Write Disable the devices before unmapping from the Director and from port

symdev -sid 4282 write_disable 26ca -sa 7d -p 0 -noprompt

Un-mappingo Create a cmd/txt file with the following line

Unmap dev 26ca from dir all:all;

o Perform preview operation using symconfigure command

Symconfigure –sid 4282 –f unmap.txt –v –nop preview

o Perform prepare operation using symconfigure command

Symconfigure –sid 4282 –f unmap.txt –v –nop prepare

o Perform Commit operation using symconfigure command

Symconfigure –sid 4282 –f unmap.txt –v –nop commit

o Verify that the device has been unmapped

Symdev –sid 4282 list -noport

Dissolve metao To Dissolve meta create a cmd/txt file with the following line

Dissolve meta dev 26ca;


Symconfigure –sid 4282 –f dissolve.txt –v –nop preview


Symconfigure –sid 4282 –f dissolve.txt –v –nop prepare


Symconfigure –sid 4282 –f dissolve.txt –v –nop commit

o Verify that the meta has been Dissoved.


Deleting hypers

o To delete the hypers create a cmd/txt file with the following line.

Delete dev 26ca:26d1;


Symconfigure –sid 4282 –f dissolve.txt –v –nop preview


Symconfigure –sid 4282 –f dissolve.txt –v –nop prepare


Symconfigure –sid 4282 –f dissolve.txt –v –nop commit

o Verify that Hypers have been deleted.

Symdev –sid 4282 list -noport

SymCli 7 Commands brief description

Symmetrix Command Line Interface Commands Brief Description

SYMCLI BASE Commands

symapierr - Used to translate SYMAPI error code numbers into SYMAPI error messages.

symaudit - List records from a Symmetrix audit log file.

symbcv - Perform BCV support operations on Symmetrix BCV devices.

symcfg - Discover or display Symmetrix configuration information.

Refresh the host's Symmetrix database file or remove

Symmetrix info from the file. Can also be used to view

or release a 'hanging' Symmetrix exclusive lock.

symchg - Monitor changes to Symmetrix devices or to logical

objects stored on Symmetrix devices.

symcli - Provides the version number and a brief description of

the commands included in the Symmetrix Command Line

symdev - Perform operations on a device given the device's

Symmetrix name. Can also be used to view Symmetrix device locks.

symdg - Perform operations on a device group (dg).

symdisk - Display information about the disks within a Symmetrix.

symdrv - List DRV devices on a Symmetrix.

symevent - Monitor or inspect the history of events within a Symmetrix.

symgate - Perform operations on a gatekeeper device.

symhost - Display host configuration information and performance stats

syminq - Issues a SCSI Inquiry command on one or all device interface

symipsec - Administers IPSec encryption on Gigabit Ethernet connections

symlabel - Perform label support operations on a Symmetrix device.

symld - Perform operations on a device in a device group (dg).

symlmf - Registers SYMAPI license keys.

sympd - Perform operations on a device given the device's physical name.

symsg - Perform operations on a storage device group (sg).

symstat - Display statistics information about a Symmetrix,

a Director, a device group, or a device.

symreturn - Used for supplying return codes in pre-action and

post-action script files.

SYMCLI CONTROL Commands

symaccess - Administer Symmetrix Access Logix.

symacl - Administer Symmetrix access control information.

symauth - Administer Symmetrix user authorization information.

symcg - Perform operations on an composite group (cg).

symchksum - Administer checksum checks when an Oracle database writes

data files on Symmetrix devices.

symclone - Perform Clone control operations on a device group or on a

device within the device group.

symconfigure - Perform modifications on the Symmetrix configuration.

symconnect - Setup or Modify Symmetrix Connection Security functionality.

symfast - Administer Symmetrix FAST (Fully Automated Storage Tiering)

policies, associations, and the FAST Controller.

symmask - Setup or Modify Symmetrix Device Masking functionality.

symmaskdb - Backup, Restore, Initialize or Show the contents of

the device masking database.

symmigrate - Migrates the physical disk space associated with a

Symmetrix device to a different data protection scheme,

or to disks with different performance characteristics.

symmir - Perform BCV control operations on a device group or on a


symoptmz - Perform Symmetrix Optimizer control operations.

symqos - Perform Quality of Service operations on Symmetrix Devices.

symrcopy - Perform Symmetrix Rcopy control operations on devices in a device file.

symrdf - Perform RDF control operations on a device group or on a


symrecover - Perform automated SRDF session recovery operations.

symreplicate - Perform automated, consistent replication of data given

a pre-configured SRDF/Timefinder setup.

symsan - List ports and LUNs visible on the SAN

symsnap - Perform Symmetrix Snap control operations on a device

group or on devices in a device file.

symstar - Perform SRDF STAR management operations.

symtier - Create and manage storage tiers within a Symmetrix.

SYMCLI SRM(Mapping) Commands

symhostfs - Display information about a host File, Directory,

or host File System.

symioctl - Send IO control commands to a specified application.

symlv - Display information about a volume in Logical Volume Group (vg).

sympart - Display partition information about a host device.

symrdb - Display information about a third-party Relational Database.

symrslv - Display detailed Logical to Physical mapping information

about a logical object stored on Symmetrix devices.

symvg - Display information about a Logical Volume Group (vg).

Sex is…. "Duty"-if done with your Wife..... "Art"-if done with your Lover..... "Education"-if done with a Virgin..... "Social Work"- if done with a Divorce....

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#2 unahb1 unahb1

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Posted 03 May 2011 - 05:17 PM thanks Pramod, do you have answers as well ?

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#3 kumar4tsm kumar4tsm

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Posted 04 May 2011 - 04:17 AM Pramod do you have Answer ?

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#4 VirtualMatrix VirtualMatrix

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Posted 04 May 2011 - 05:45 AM

Thanks Pramod. Like others I am also looking for the answers.

And reputation goes from my end. Back to top


#5 raghavkamath82 raghavkamath82

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Posted 04 May 2011 - 06:04 AM Pramod,

It is lazy to ask, but can u also post the doc version of questions with answers? raghavkamath82, proud to be a member of IT Certification Forum since Oct 2008.

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#6 S0cialW0rker S0cialW0rker

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Posted 05 May 2011 - 02:28 AM

raghavkamath82, on 04 May 2011 - 06:04 AM, said:Pramod,

It is lazy to ask, but can u also post the doc version of questions with answers?

Hi Raghav....

I am trying to prepare a doc with answers.Soon i will post it.

Till u people help me by posting the answers of the questions which u know. Sex is…. "Duty"-if done with your Wife..... "Art"-if done with your Lover..... "Education"-if done with a Virgin..... "Social Work"- if done with a Divorce....

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#7 montecito montecito

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Posted 06 May 2011 - 02:53 AM I will answer all SAN related questions while I am in office that will be in another 2- 3 hours.

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Posted 10 May 2011 - 02:14 PM create a zone and place it in the vsan # zone name testzone1 vsan 4add a member (port wwn example) # member pwwn 10:00:00:00:c9:21:40:b8 (port on the host)add a member (fabric port wwn example) # member fwwn 10:01:10:01:10:ab:cd:ef (port on the switch)add a member (FCID example - hard zoning) # member fcid 0x7f0000 (24 bit address)add a member (FC alias example) # member fcalias payroll

MDS-series common commandsdisplay logged in WWN, display vsan information # show flogi databasedisplay the specific vsan logins # show fcns database vsan 4activatng a zoneset # zoneset activate name zone1 vsan 4delete a zoneset # clear zone dataabse vsan 4configure the default zone # zone default-zone permit vsan 4display zones and zonsets # show zoneset active# show zoneset# show zoneset active vsan 4copy active zone set to the full zone set # zone copy active-zoneset full-zoneset vsan 4distribute the full zoning database to others switches # zoneset distribute full vsan 4 ========================================================================================================Creating zone by WWN zonecreate "zone1", "20:00:00:e0:69:40:07:08 ; 50:06:04:82:b8:90:c1:8d"Create a zone configuration cfgcreate "test_cfg", "zone1 ; zone2"saving the zone configuration cfgsave (this will save across reboots)enable the zone configuration cfgenable "test_cfg"saving the zone configuration cfgsaveview zoning information zoneshow or cfgshow

If you want you can create alias for zone members as well with "alicreate" and use cfgadd command to add zones to the active configuration.

Let me know if i missed something Edited by montecito, 10 May 2011 - 02:42 PM.

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#9 Nayak Nayak

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Posted 13 May 2011 - 03:02 PM Its been quite some time since I worked with EMC products, but to the best of my knowledge here are the answers

DMX-4 Interview Questions

· Explain Rule 17 in DMX?The Rule of 17 is to make sure that redundancy is in place so that the host does not lose access in case of a FA/DA director failure. The director cage of DMX can have16 director cards numbering from 1-16. Two director cards are paired in such a way that the total adds up to 17. Example when a host is connected/lun is mappedto the FA it is mapped to directors 1 and 16 or to directors 10 and 7.

· What are the Management Tools for DMX?CLI -- Solution Enabler various version depending on the Enginuity codeGUI -- SMC (Symmetrix Management console)

·· How do you calculate number of cylinders for 50GB LUN?A cylinder is roughly 1 mb in size and 0.937mb to be precise

· What is the maximum hyper size in DMX-4?60Gb and in case of Vmax 240Gb

· How many hypers can create in a Single disk?255 and in case of Vmax 512

· How many members can contain in one meta?Max 255 members

· How many LUN IDs available per port?Technically speaking 2048. Per port pair 4096, however this is flexible meaning either one can have all the 4096 devices or 2048 each or any combination which does notexceed 4096. However this is not a good practice.

· What Dynamic LUN addressing?Once the lun id on the port crosses 255 the host will not be able to see the lun and hence lun offset has to be used which has to be implemented carefully if not wouldlead to host losing access to devices(luns). In order to overcome this dynamicl lun addressing is used in which the luns are numbered in the ascending order to the HostHBA

· How do you add a new member to the existing Meta?using the add command

add dev 1234 to meta 4567 and then run the symconfigure command.

· What is stripping and what is Concatenating?

· What are the DMX-4 supported disk types, no. of disks and maximum capacity?FC,SATA. SSD is not supported. Capacity and number of disks vary from configuration to configuration.

· Briefly explain the DMX-4 supported Device types?

· What are the RAID levels DMX-4 Supports? RAID 0 -unprotectedRAID 1 - 2-way MirrorRAID 5RAID 6RAID 10 - 2 way Mirror Meta (Striped)

· What are Vault drives and Hot Spare?

· What is Preview, Prepare and Commit while using Symconfigure command?Preview - verifies the command syntaxPrepare - ensured that sufficient system resources are avialble and also checks for any existing locksCommit- commits the configuration. This can be run directly as it performs both the Preview and prepare actions as well.

· How do you check the back-end Operations on Symmetrix Array?

· How do you check the failed disks in the Symmetrix Array?symdisk list -failed

or symdev list -servcie_state failed and then run a symdev show on that device

· What are the service states of a deviceRWNRWrite_disabled

· How do you reserve the devices?

using reserve dev and then running the symconfigure command

· What is Tiering and how do you create the Disk GroupsTiering is the process of grouping the disks based on their size, speed and Technology (Tier consisting of 1TB SATA or 400GB FC 10K Disks)

· How do you check the free space by Disk group and Array as whole?

symconfigure list -freespace or more accurate is symdisk list -dskgrp_summary

· 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?1. Zoning/masking not done2. Correct Flags not set at the FA level3. HBA does not have correct driver or firmware4. Multipathing issues 5. Lun offset might not have been done in case of old DMX

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Posted 20 May 2011 - 12:46 PM What are the DMX-4 supported disk types, no. of disks and maximum capacity?FC,SATA. SSD is not supported. Capacity and number of disks vary from configuration to configuration.

=====================

This is not correct. DMX-4 does support SSD and in DMX world it is at times referred to as Flash drives.

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#11 theenagar theenagar

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Posted 25 May 2011 - 09:02 PM Folks,

U ppl are doing a great Job!!! Keep it up Back to top

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#12 mac4techs mac4techs

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1 thanks Posted 16 December 2011 - 07:09 AM Thanks for the efforts, Does someone have Hitach1 and netapp storage interview questions as well

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