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EMC Interview Questions For Storage


1) Network FailSafe device is controlled by which switch protocol?
None
2) Which NetWorker feature enables multiple storage nodes to use the same device?
Dynamic drive sharing
3) What value has the address space been increased to with the introduction of IPv6?
128 bits
4) What is a role of a NetWorker storage node?
Manages backup devices
5) Which protocol is used by open systems hosts to access storage in Fiber Channel SANs?
SCSI
6) A read cache miss operation on a Symmetrix has several steps. The first step is that the host
sends a read request. What is the next step?
The Channel Director checks the track table.
7) What are two CLARiioN High Availability features?
Dual LCCs, Dual storage processor
8) What do VLANs reduce?
The number of packets processed by clients
9) What does EtherChannel link aggregation do?
Disables links of a different speed to the majority of links in the trunk
10) What is used by NetWorker to manage its configuration?
Resource directory
11) In Asynchronous transmissions how are characters transmitted?
Single characters are transmitted at a time
12) What is UDP?
Connectionless base protocol
13) What is VDMs?
VDMs are isolated CIFS servers with their own environments
14) What generates the Content Address for a Centera?
Hashing algorithm
15) Which level of backup is performed during a NetWorker consolidated backup?
1
16) In a NetWorker browsable recovery, what is true about the destination client?
Must also be the administering client
17) In a NetWorker recovery, which client role performs the recovery?
Administering
18) What is Celerra Replicator?
Is an asynchronous data replication solution
19) What is the default subnet mask for an IPv4 Class B address?
255.255.0.0
20) Which event occurs in a NetWorker server-initiated backup but NOT in a client-initiated
backup?
Data life-cycle policies are enforced
21) How many octets in a default Class C IPv4 address make up the network portion?
3
22) Which NetWorker resource is used to determine the backup level for a client?
Schedule
23) What is a characteristic of Centera?
Guaranteed content authenticity
24) What load balancing policies are available in PowerPath?
No Redirect, Round robin
25) Which of the following Symmetrix connectivity options can you use with Open Systems and Windows Hosts?
Fibre Channel and SCSI
26) Which of the following allows you to use ControlCenter Automated Resource Manager Storage Provisioning Services?
Storage pools and storage policies
27) In Celerra TimeFinder/FS Far Copy how does replication happen?
Source and Target are asynchronously replicated
28) In a Centera, what is a supported replication topology?
Star
29) How many optical network ports are available on a NS500 DataMover?
None
30) What does the OSI Physical layer provide?
The media specification
31) What is a function of the API for Centera?
Separates the BLOB from the metadata
32) What is true about FTP and TFTP ?
FTP uses port 21 and TFTP uses port 69
33) When is Celerra SRDF used?
Is implemented over a campus distance
34) How is free maintained in the CLARIION write cache?
Cache is flushed to the driver during I/O only the least -recently used page are flushed
35) Which symmetric presents devices to hosts?
Channel Director
36) What dose the control Center storage agent monitor?
CLARIION
37) When is the Port Bypass Card used on a Symmetrix DMX?
When the Disk Director fails
38) Which of the Celerra data replication options provides a point-in-time filesystem copy over IP?
Celerra Replicator
39) What does ISL aggregation do?
Enables distribution of traffic over the combined bandwidth of two or more ISLs and increases
availability
40) What are features of Celerra Replicator?
Synchronous data recovery, Point-in-time copy over an IP network
41) Which protocol does open systems hosts use to access storage in Fibre Channel SANs?
SCSI
42) Which NetWorker host performs the backup of the bootstrap save set?
Server during a server-initiated backup
43) Which product is used to create Logical Volumes on a Symmetrx system?
Control Center Symmetrix Manager
44) Which Symmetrix connectivity options can be used with mainframe hosts?
ESCON and FICON
45) Which control center view provides a single graphical view of the whole environment, including
consolldated alters and threshold charts?
At A Glance
46) Which set component is requires for write caching to be enable in a CLARIION array?
2 power supplies, 2 storage processors,2 LCC cards and at least one standby power supply
47) What is a benefit of using zoning in a SAN?
Security at the switch port level
48) What is a characteristic of enterprise directors?
Fully redundant components
49) Which java based interface manages standalone MDS-Series switches?
Fabric manger
50) Which protocol is used by open system hosts to access block level storage over IP?
ISCSI
51) What is a characteristic of a Content Address in Centera?
Globally unique
52) What is use of Internet Control Message Protocol ICMP?
Sends administrative information between network devices
53) What is the purpose of storage groups in a CLARiiON storage array?
LUN masking

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EMC interview questions for technical support


1) What statement best describes TimeFinder/Mirror Clone?
Uses copy on access
2) Which of the views in ControlCenter Console displays Front EndDirectors, Disk Directors, and all the devices for a Symmetrix array?
Visual Storage
3) Which is a feature of TimeFinder/Snap related to data accessibility after snap session is initiated?
Data is accessible on the Snap copy immediately after the Snap session is initiated
4) What is the difference between theNSXXXG and the NSXXX?
NSXXXG allows the sharing of back-end storage with other hosts
5) Which views in the ControlCenter Console can be used to monitor the environment?
Relationship, Topology
6) Which is monitored by the ControlCenter Host agent?
Windows 2000 disk
7) What is a benefit of SRDF/Automated Replication solution?
The SRDF/Automated Replication solution provides a copy of the data on the Target device, which will be several minutes to hours behind the Source
8) What is correct sequence for starting a ControlCenter component?
Repository, Server, Store
9) What is the purpose of a TimeFinder/Mirror reverse split operation?
The BCV will synchronize from its mirror
10) After a client has presented information to be stored on Centera, what is the next step?
Unique Content Address is calculated
11) What is the purpose of Dynamic Mirror Service Policy for Symmetrix?
It uses both M1 and M2 mirrors to fulfill read requests as quickly as possible.
12) Is routing same on all operating systems?
No. Routing is not the same on all operating systems
13) Is routing same on all UNIX OS?
No. Routing is not the same on UNIX operating systems
14) Will all switches route multicast traffic by default ?
No. Not all switches will route multicast traffic by default.
15) What command will you make use of to get details on routing table in windows or Linux systems?
To observe the routing table on a UNIX/Linux or Windows server, you should use the netstate – nr command
16) What information is displayed on the Availability Tracking screen?
The amount of planned downtime of a managed resource.
17) What causes the data source to report an unknown state?
The agent failed or shut down
18) How should you determine which ports to use for the AAM installation?
Use the ft_setup script to view available ports during installation
19) What tasks can occur on a secondary agent?
Restart the backbone, Maintain a copy of the database
20) A system administrator is monitoring the AAM domain and notices that a Resource Group is in the unknown state. What does this state indicate?
The agent on the node hosting the Resource group is in the failed state.
21) What is a key requirement of Content Addressed Storage?
Longevity
22) What failover and failback does Celerra SRDF/A support?
Supports a manual failover and failback process
23) What are Virtual DataMovers also called as VDMs ?
They are dedicated CIFS servers
24) In a Centera, what is the minimum node configuration of Generation 4 Hardware?
4
25) Which statement about WINS is correct?
Resolves UNC names to IP address
26) With an IP network address of 132.15.0.0 and a subnet mask of 255.255.240.0 without
enabling 1 bit subnetting, what would be the broadcast address on the first subnet?
132.15.31.255
27) With a subnet mask of 255.255.240.0, how many subnets are possible without enabling 1
bit subnetting?
14
28) Which statement about NetBIOS is correct?
It is a non-routable protocol, without encapsulation into another protocol
29) What is an operation of the OSI Transport layer?
Provides a reliable message stream to the user interface
30) Which statement about Network backup is correct?
The tape device is directly attached to the backup server
31) Which port is the default port used by HTTP Web Browsers?
80
32) What is a function of NetWorker?
Protect critical business data
33) Which statement about Layer 3 devices is correct?
Connect two different logical networks together
34) Which Centera GUI tool is used to configure site specific information?
Centera Viewer
35) In Network backup are permissions on NFS and CIFS files simultaneously preserved?
NFS and CIFS permissions on the same file system are not simultaneously preserved
36) What is a NetWorker remote device?
A device managed by a storage node other than the NetWorker server
37) What are features of a NetWorker storage node?
Manages devices, generates tracking data, and supports multiplexing
38) In a Centera, what is an Access Profile?
Used by applications to authenticate to a Cluster
39) What is a characteristic of Centera?
Single instance storage
40) What is the Address Resolution Protocol responsible for resolving in Direct Routing?
The MAC address of a known IP address
41) Which statement about Synchronous transmissions is correct?
Multiple characters are transmitted at a time
42) What is the Address Resolution Protocol responsible for resolving in Indirect Routing?
The MAC address of the Default gateway
43) What is a function of NetWorker?
Centralize and automate backup and recovery
44) With IP version four IPv4 addresses, how many octets make up the address?
4
45) With IPv6, what is the size of the address space?
128 bits
46) What is the maximum number of DataMovers supported in the NS5XX range of equipment?
2
47) For what purpose are Class D IPv4 addresses used?
Multicast
48) Which event occurs in a NetWorker server-initiated backup but NOT in a client-initiated
backup?
Bootstrap save is created
49) Which of the following protocols is used to share the filesystem to clients in the
Windows environment?
CIFS
50) What is the purpose of the TimeFinder/SRDF QoS Task Bar in ControlCenter?
Performance Management
51) Which of the following is the last step of retrieving an object in the Centera environment?
Centera delivers object authentically
52) How many octets in a default Class B IPv4 address make up the network portion?
2
53) What is the maximum number of Blades supported in the NSX range of equipment?
8
54) How many optical network ports are available on a NSX Blade?
2
55) What does SNMP normally use?
The non-guaranteed services of UDP

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EMC Interview Questions


1) What information is displayed on the Availability Tracking screen?
The amount of planned downtime of a managed resource.
2) What causes the data source to report an unknown state?
The agent failed or shut down
3) How should you determine which ports to use for the AAM installation?
Use the ft_setup script to view available ports during installation
4) Which two tasks can occur on a secondary agent in EMC environment?
Restart the backbone, Maintain a copy of the database
5) A system administrator is monitoring the AAM domain and notices that a Resource Group is in the unknown state. What does this state indicate?
The agent on the node hosting the Resource group is in the failed state
6) Where is the initial microcode program load file – IMPL.bin – stored in Symmetrix?
Service Processor and Director boards
7) How are disks accessed by UNIX hosts?
Using device special files
8) What are iSCSI naming conventions?
iQN, EUI
9) How does TimeFinder/Snap save disk space while providing full access to theoriginal data on the snapshot copy?
It creates pointers to the original data
10) What is the difference between theNSXXXG and the NSXXX?
NSXXXG allows the sharing of back-end storage with other hosts
11) Which is monitored by the ControlCenter Host agent?
Windows 2000 disk
12) What is the benefit of SRDF/Automated Replication solution ?
The SRDF/Automated Replication solution provides a copy of the data on the Target device, which will be several minutes to hours behind the Source
13) What is the purpose of a TimeFinder/Mirror reverse split operation?
The BCV will synchronize from its mirror
14) What is the correct sequence for starting a ControlCenter component?
Repository, Server, Store
15) After a client has presented information to be stored on Centera, what is the next step?
Unique Content Address is calculated
16) What is the purpose of Dynamic Mirror Service Policy for Symmetrix?
It uses both M1 and M2 mirrors to fulfill read requests as quickly as possible
17) Which views in the ControlCenter Console can be used to monitor the environment?
Relationship, Topology
18) What is a feature of both TimeFinder/Mirror and TimeFinder/Mirror Clone?
Identical storage capacity as the Source device
19) How many octets in a default Class B IPv4 address make up the network portion?
2
20) What is the maximum number of Blades supported in the NSX range of equipment?
8
21) How many optical network ports are available on a NSX Blade?
2
22) learnersreference.com has a primary CX600 array and a secondary CX400 array. learnersreference.com wants to do data backup on the secondary site while the applications are still running on the primary site. How can bellbang.com accomplish this goal?
MirrorView and SnapView
23) Which best describes a Fan-out Ratio for a SAN attached array?
The qualified maximum number of initiators that can access a single Target port through a SAN
24) Which web interfaces can be used to manage standalone M-Series switches?
EWS
25) Which components are required in order to enable write caching in a CLARiiON array?
2 power supplies, 2 storage processors, 2 LCC cards and at least one standby power supply
26) Which is not a CLARiiON High Availability feature?
Dual consoles
27) What are Celerra Replicator features?
Point-in-time copy over an IP network, Only sends changed data over the IP network
28) Which types of disk drives are currently used on CLARiiON CX series storage systems?
Dual ported Fibre Channel disk drives and ATA disk drives
29) What is the function of the Control Center infrastructure?
Stores data for objects
30) What are characteristics of cache memory on a CLARiiON array?
Write cache is always mirrored, Page size is set for the array
31) In a Symmetrix, what is Parity RAID?
Difference data that are results of XOR calculation passed between drives by Das
32) Which protocol uses TCP/IP to tunnel Fibre Channel frames?
FCIP
33) Which network based backup solution maintains both NFS and CIFS attributes?
NDMP based backups
34) Which types of disk drives are currently used on CLARiiON CX series storage systems?
Dual ported Fibre Channel disk drives and ATA disk drives
35) What are features of Celerra Replicator?
Synchronous data recovery, Point-in-time copy over an IP network
36) What is the function of the Control Center infrastructure?
Stores data for objects
37) What are characteristics of cache memory on a CLARiiON array?
Write cache is always mirrored. Page size is set for the array
38) Which protocol uses TCP/IP to tunnel Fibre Channel frames?
FCIP
39) Which network based backup solution maintains both NFS and CIFS attributes?
NDMP based backups
40) Which product is used to create Logical Volumes on a Symmetrx system?
Control Center Symmetrix Manager
41) Which Symmetrix connectivity options can be used with mainframe hosts?
ESCON and FICON
42) Which control center view provides a single graphical view of the whole environment, including consolldated alters and threshold charts?
At A Glance
43) What is a benefit of using zoning in a SAN?
Security at the switch port level
44) What is a characteristic of enterprise directors?
Fully redundant components
45) Which protocol is used by open system hosts to access block level storage over IP?
ISCSI
46) How is free maintained in the CLARIION write cache?
Cache is flushed to the driver during I/O only the least -recently used page are flushed
47) Which symmetric presents devices to hosts?
Channel Director
48) In a Centera, what is an Access Profile?
Used by applications to authenticate to a Cluster
49) What is a characteristic of Centera?
Single instance storage
50) What is the Address Resolution Protocol responsible for resolving in Direct Routing?
The MAC address of a known IP address
51) How are characters transmitted in Synchronous transmissions ?
Multiple characters are transmitted at a time
52) What is the Address Resolution Protocol responsible for resolving in Indirect Routing?
The MAC address of the Default gateway
53) What is a function of NetWorker?
Centralize and automate backup and recovery
54) What are features of a NetWorker storage node?
Manages devices, generates tracking data, and supports multiplexing
55) With IP version four (IPv4) addresses, how many octets make up the address?
4
56) With IPv6, what is the size of the address space?
128 bits
57) How is metadata passed in NDMP2D backup ?
Metadata passes over the network infrastructure
58) A Windows client must perform which operation to access a NAS advertised connection point?
Map
59) A Windows client must perform which operation to access a NAS advertised connectionpoint?
Map
60) What is the final step when retrieving an object in the Centera environment?
Centera authenticates request and delivers object
61) What is the first step or event when storing an object in a Centera environment?
Unique Content Address is calculated
62) What is a characteristic of a Content Address in a Centera?
Location-independent
63) What do VLANs reduce?
The router traffic overhead in the network infrastructure
64) What is a characteristic of Centera fixed content?
Unalterable
65) How does NetBIOS handle name resolution?
Makes use of an /mhosts/file for local administration of name resolution
66) What is the second step or event when storing an object in a Centera environment?
Object is sent to Centera via Centera API over IP
67) What best describes the TimeFinder Full Establish operation between a Standard and BCV device pair?
Change the status of the BCV to Not Ready; copy the entire contents of the Standard device to the BCV
68) What is the purpose of Dynamic Mirror Service Policy for Symmetrix?
It uses both M1 and M2 mirrors to fulfill read requests as quickly as possible.
69) What are the data types supported in NAS?
File level
70) Which views in ControlCenter Console displays Front End Directors, Disk Directors, and all the devices for a Symmetrix array?
Visual Storage
71) What is the purpose of the Masking ControlCenter Task Bar in ControlCenter?
Storage Allocation
72) Which NetWorker servers can NetWorker Management Console manage?
All NetWorker servers in the enterprise
73) What does the OSI Data Link layer provide?
Data encapsulation
74) What tool is used by service personnel to troubleshoot the Centera?
Centera Viewer
75) Is AVM used by default when creating volumes with the GUI?
Yes. It is used by default when creating volumes with the GUI
76) Give name of a dynamic routing protocol :-
OSPF
77) What is a feature of SnapView Clones?
Copy requires same space as Source LUN
78) In a CLARRiiON array, a read cache operation begins when host requests data. What is the next step in the process?
The storage processor recognizes that the requested data is an cache memory, and retrieves the data
79) Which access method id used for file sharing over an IP network?
NAS
80) Which is a valid Fibre Channel Topology?
Switched Fabric
81) A read cache miss operation on a Symmetrix has several steps. The first step is that the hostsends a read request. What is the next step?
The Channel Director checks the track table.
82) At what percentage of cache capacity does high water mark cache flushing initiate in a CLARiiONsystem at the default setting?
80%
83) In a CLARRiiON array, a read cache operation begins when host requests data. What is the nextstep in the process?
The storage processor recognizes that the requested data is an cache memory, and retrieves the data
84) In ControlCenter, what does the Masking ControlCenter Task Bar do?
Storage Allocation
85) What determines the order data is flushed from Symmetrix Global Cache Memory?
Age-link-chain
86) Which two types of storage connectivity are associated with block level data?
DAS and SAN
87) Which protocol is used by open systems hosts to access block level storage over IP?
ISCSI
88) What is a characteristic of file level host storage access?
Data is accessed using NFS, CIFS, and FTP
89) Which Symmetrix connectivity options can be used with Open Systems and Windows Hosts?
Fibre Channel and SCSI
90) What are characteristics of a Content Address in a Centera?
Location-independent, Globally unique
91) Which Symmetrix system uses a two bus architecture that consists of an “X” nad a “Y” bus?
Symmetrix 4.8
92) What is a characteristic of Connectrix enterpise directors?
Fully redundant components
93) Which load balancing policy available in PowerPath relates to path failover only?
Request
94) What is Windows NT security account manager?
It is the database containing the identity of the users and their credentials
95) What is the function of the Automated Resource Manager – Storage Provisioning Services
component of ControlCenter?
Reports key historical performance data
96) In a Symmetrix, what is Dynamic Sparing?
One or more disk drives that used when Symmetrix detects a potentially failing or failed device
97) How does TimeFinder/Snap save disk space while providing full access to the original data on the snapshot copy?
It creates pointers to the original data
98) Can NAS clients access data that are physically separate?
Yes. They can access data irrespective of their physical locality
99) Give name of network topology popularly adopted in storage infrastructure?
Ring,Bus
100) Which is a feature of both TimeFinder/Mirror andTimeFinder/Mirror Clone?
Identical storage capacity as the Source device