NetApp NetApp Certifications NS0-155 Questions & Answers

• Question 161:

  Host multi-pathing describes a ____________ solution that has at least two distinct ______________ paths to a LUN.

  A. Token ring, physical

  B. FC SAN, virtual

  C. FC or IP SAN, virtual

  D. FC or IP SAN, Physical

  Correct Answer: D

  http://en.wikipedia.org/wiki/Multipath_I/O

  Fiber Channel (FC), FCoE and iSCSI encapsulate SCSI-3. FCoE and iSCSI further encapsulate the transport within IP; hence the term IP SAN.

  In computer storage, multipath I/O is a fault-tolerance and performance enhancement technique whereby there is more than one physical path between the CPU in a computer system and its mass storage devices through the buses,

  controllers, switches, and bridge devices connecting them.

  A simple example would be a SCSI disk connected to two SCSI controllers on the same computer or a disk connected to two Fibre Channel ports. Should one controller, port or switch fail, the operating system can route I/O through the

  remaining controller transparently to the application, with no changes visible to the applications, other than perhaps incremental latency.

• Question 162:

  If you were troubleshooting and wanted to look at SnapMirror log files, what is the path to these files?

  A. /vol/vol0/etc/log/snaplog/

  B. /vol/vol0/etc/snapmirror/

  C. /vol/vol0/etc/snaplog/

  D. /vol/vol0/etc/log/

  Correct Answer: D

  https://library.netapp.com/ecmdocs/ECMP1196979/html/man1/na_snapmirror.1.html The root volume is always vol0 and etc is contained therein. When exporting the root volume via NFS, the path is/vol/vol0; so the full path to snapmirror log

  files is /vol/vol0/etc/log.

  /etc/log/snapmirror.

  This file logs SnapMirror activity. Log file for current week. /etc/log/snapmirror.[0-5] SnapMirror log files for previous weeks.

• Question 163:

  Which statement describes the results of the SnapMirror resynce command?

  A. Resynchronization finds the newest common snapshot shared by the two volumes or qtree, and removes all newer information on the storage system on which the command is run.

  B. Resynchronization will cause the loss of all data written to the destination after the original base snapshot was made.

  C. Resynchronization will update the snapshot on the destination filer.

  D. Resynchronization will update the snapshot on the source filer.

  Correct Answer: A

  https://library.netapp.com/ecmdocs/ECMP1196979/html/man1/na_snapmirror.1.html

  snapmirror resync

  [ -n ] [ -f ] [ -S source ] [ -k kilobytes ] [ -s src_snap ] [ -c create_dest_snap ] [ -w ] destination Resynchronizes a broken-off destination to its former source, putting the destination in the snapmirrored state and making it ready for update

  transfers. The resync command must be issued on the destination node.

  The resync command can cause data loss on the destination. Because it is effectively making destination a replica of the source, any edits made to the destination after the break will be undone.

  For formerly mirrored volumes, the resync command effectively performs a SnapRestore (see na_vol (1)) on the destination to the newest snapshot which is common to both the source and the destination. In most cases, this is the last

  snapshot transferred from the source to the destination, but it can be any snapshot which is on both the source and destination due to SnapMirror replication. If new data has been written to the destination since the newest common snapshot

  was created, that data will be lost during the resync operation.

• Question 164:

  There are three phases of Non Disruptive Volume Movement (NDVM). What is the correct sequence of these phases?

  A. Setup Phase, Mirror Phase, Cutover Phase

  B. Initialization phase, Copy Phase, Migrate Phase

  C. Begin Phase, Move Phase, Complete Phase

  D. Setup Phase, Data Copy Phase, Cutover Phase

  Correct Answer: D

  https://communities.netapp.com/servlet/JiveServlet/previewBody/9734-102-1- 17848/ PDF_Tips_Data_Motion_0211.pdf

  Non-disruptive Volume Movement is called DataMotion. DataMotion uses SnapMirror for volume migration. A DataMotion migration occurs in three phases:

  1.

  Setup

  2.

  Data copy

  3.

  Cutover

• Question 165:

  Which two cp types would indicate a busy storage system? (Choose two).

  A. cp_from_log_full

  B. cp_from_busy

  C. cp_from_cp

  D. cp_from_timer

  Correct Answer: AC

  http://backdrift.org/man/netapp/man1/na_sysstat.1.html

  http://redhunter.com/blog/2010/02/11/netapp-consistency-points-in-cacti/ cp_from_log_full (log full) - the current NVRAM bank is full and the system switches to the other one and starts writing this to disk. Very heavy write activity.

  cp_from_cp (aka Back to Back) - filer is overloaded. The write traffic is coming in faster than it can be written and the filer is running out of NVRAM capacity in one bank before the data in the other bank can be written.

  cp_from_busy is not a real cp type

  cp_from_timer - 10 seconds since the last CP it means the system is pretty idle write-wise.

• Question 166:

  Is NetApp storage Encryption supported in Data ONTAP 8.1.1 Cluster-Mode?

  A. No, but you can file a PVR to request support.

  B. No. it is targeted for a future release of Data ONATP.

  C. Yes, only with a special license installed.

  D. Yes, it has been supported since 8.0.1.

  Correct Answer: D

  http://www.ntapgeek.com/2011/03/netapp-storage-encryption-available.html March, 2011: "With the recent release of Data ONTAP 8.0.1, NetApp now offers full disk encryption to prevent unauthorized access to data at rest."

• Question 167:

  Which exportfs command will temporally export the resource while ignoring the options specified in the / etc/exports file?

  A. exportfs v

  B. exportfs u

  C. exportfs a

  D. exportfs i

  Correct Answer: D

  https://library.netapp.com/ecmdocs/ECMP1196890/html/man1/na_exportfs.1.html exportfs [ -v ] [ -io options ] path -i Ignores the options specified for a file system path in the /etc/exports file. If you do not specify the I option with the -o option, Data ONTAP uses the options specified for the file system path in the /etc/ exports file instead of the options you specify on the command line.

• Question 168:

  What is the maximum distance between a standard clustered pair at 2Bbps?

  A. 100 meters

  B. 10 meters

  C. 50 meters

  D. 500 meters

  Correct Answer: D

• Question 169:

  For each Open Systems platform directory to be backed up to the SnapVault secondary storage system you must execute _____________.

  A. An initial baseline copy

  B. A temporary copy

  C. An incremental copy

  D. A scheduled update copy

  Correct Answer: A

  https://library.netapp.com/ecmdocs/ECMP1196991/html/GUID-EEBC8B52-BEA9-4B49-874F- 7EC78D3F602E.html

  Each open systems platform, when prompted by the secondary system, transfers initial base images of specified directories to qtree locations on the secondary system. Note: There are no primary-side Snapshot copies in Open Systems SnapVault.

• Question 170:

  What does it signify if the disks are "not owned" in a FAS2020 system?

  A. The disks are mailbox disks.

  B. The disks are spare disks.

  C. The disks are data disks.

  D. The disks are not used.

  Correct Answer: D

  Disks must be assigned to an aggregate to be used as raid group members or spares. Unassigned disks are displayed as "not owned".