NetApp NetApp Certifications NS0-155 Questions & Answers

• Question 131:

  Which three attributes would you specify when creating a LUN? (Choose three)

  A. The host operating system of the system attached to LUN.

  B. The version of Data ONTAP

  C. The size of the LUN.

  D. The path to the LUN.

  Correct Answer: ACD

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

  The usage for lun create is shown below. Options not in brackets are mandatory. lun create -s size -t ostype [ -o noreserve ] [ -e space_alloc ] lun_path This usage of the lun create command should be employed to create a new LUN of given size, with initially zero contents. The LUN is created at the lun_path given. No file should already exist at the given lun_path. The directory specified in the lun_path must be a qtree root directory.

  The size is specified in bytes. Optionally, a number followed by a one-character multiplier suffix can be used: c (1), w (2), b (512), k (1024), m (k*k), g (k*m), t (m*m). The size of the created LUN could be larger than the size specified, in order to get an integral number of cylinders while reporting the geometry using SAN protocols.

  The size of the LUN actually created is reported if it is different from that specified in the command. The mandatory ostype argument is one of: solaris (the LUN will be used to store a Solaris raw disk in a singleslice partition), windows (the LUN will be used to store a raw disk device in a single-partition Windows disk using the MBR (Master Boot Record) partitioning style), hpux (the LUN will be used to store HP-UX data), aix (the LUN will be used to store AIX data), vld (the LUN contains a SnapManager VLD), linux (the LUN will be used to store a Linux raw disk without any partition table), netware (the LUN will be used to store NetWare data), vmware (the LUN will be used to store VMware data), windows_gpt (the LUN will be used to store Windows data using the GPT (GUID Partition Type) partitioning style), windows_2008 (the LUN will be used to store Windows data for Windows 2008 systems), openvms (the LUN will be used to store Open-VMS data), xen (the LUN will be used to store Xen data), hyper_v (the LUN will be used to store Hyper-V data), solaris_efi (the LUN will be used to store Solaris_EFI data).

  By default, the LUN is space-reserved. To manage space usage manually, -o noreserve can be specified. Using this option will create a LUN without any space being reserved. Provisioning threshold events can be enabled by specifying -e space_alloc option. This option has to be used in conjunction with -o noreserve.

• Question 132:

  Which three are valid LUN commands? (Choose three)

  A. lun clone

  B. lun copy

  C. lun move

  D. lun rename

  E. lun snap

  Correct Answer: ACE

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

  The following commands are available in the lun suite:

  

• Question 133:

  Which three /etc/snapmirror.conf entries will support synchronous or semi-synchronous SnapMirror?

  A. FilerA:source_vol FilerB:destination_vol visibility_interval = lhr, outstanding = 3ms, cksum=crc32 syns

  B. FilerA:source_vol FilerB:destination_vol 0-55/5 * * *

  C. FilerA:source_vol FilerB:destination_vol sync

  D. FilerA:source_vol FilerB:destination_vol outstanding=3s sync

  Correct Answer: ACD

  https://library.netapp.com/ecmdocs/ECMP1196979/html/man5/na_snapmirror.conf.5.html Each relationship entry of the /etc/snapmirror.conf file is a single line containing space-separated fields.

  The entry has this format:

  Source destination arguments schedule schedule

  This is the schedule used by the destination node for updating the mirror. It informs the SnapMirror scheduler when transfers will be initiated. The schedule field can contain the word sync to specify fully synchronous mirroring, semi-sync to

  specify semi-synchronous mirroring, or a cron-style specification of when to update the mirror.

  visibility_interval

  The value for this argument is a number optionally followed by the suffixes: s (seconds), m (minutes) or h (hours). If a suffix is not specified, value is interpreted as seconds. This argument controls the amount of time before an automatic

  snapshot is created on the source volume that is synchronously mirrored. The value is the number of seconds between automatically created snapshots. The default value is 3 minutes. A small number here can negatively affect the

  performance of the mirror. This argument is ignored for asynchronous mirrors.

  Outstanding (deprecated)

  This argument controls the performance versus synchronicity trade-off for synchronous mirrors. The value for this argument is a number followed by the suffixes: ops (operations), ms (milliseconds) or s (seconds). Setting a value less than 10s

  configures the mirror to run in fully synchronous mode. Setting a value greater than or equal to 10s configures the mirror to run in semi-synchronous mode. This argument is ignored for asynchronous mirrors. Please note that this is a

  deprecated option. Use the schedule field to specify the synchronous mode for the mirror.

  cksum

  This controls which checksum algorithm is used to protect the data transmitted by SnapMirror. Currently supported values are "none", "crc32c", and "crc32c_header_only". The value "crc32c_header_only" has been added only for volume

  SnapMirror and is not supported for synchronous SnapMirror and qtree SnapMirror.

• Question 134:

  If you believe you create FC SAN performance problem, which NatApp utility would gather both your Solaris host and storage system data for analysis?

  A. sio_ntap.exe

  B. prestart

  C. poststat

  D. perfstat

  Correct Answer: D

  https://communities.netapp.com/docs/DOC-1059

  Performance and Statistics Collector (perfstat) is a data collection tool with several key properties:

  Captures all needed performance information with one command Captures information from host(s) and filer(s)

  Captures all information simultaneously for cross correlation Operates on all host platforms and all filer platforms

  All captured data is recorded in a single plain-text output file

  Perfstat comes in exactly two flavors:

  Unix/Linux version (perfstat.sh) Windows version (perfstat.exe)

  Supported platforms: Unix: AIX, HP-UX, Linux, OSF1, Solaris, FreeBSD Windows: 2000/XP/2003

• Question 135:

  When running deduplication on SnapVault destinations, which three statements are true?

  A. The target SnapVault controller deduplicates inline.

  B. The source SnapVault data is deduplicated inline on the target before it is written to disk.

  C. Deduplication internally synchronizes with the SnapVault schedule on the destination.

  D. The source (primary) system sends duplicated data even if the source data is deduplicated.

  E. Deduplication with SnapVault creates a snapshot, deduplicates, then deletes and recreates the snapshot to effectively deduplicate savings.

  Correct Answer: CDE

  https://library.netapp.com/ecmdocs/ECMP1196986/html/GUID-E5AD37DE-2F44-47DB-90A3- C8E115FCBFB7.html SnapVault replicates at the file level not the block level. Deduplication is always a post-processed activity for Data OnTap, while compression is an inline process. The deduplication schedule depends on the SnapVault update schedule on the destination system. A new Snapshot copy replaces the archival Snapshot copy after deduplication finishes running on the destination system. (The name of this new Snapshot copy is the same as that of the archival copy, but the Snapshot copy uses a new timestamp, which is the creation time.) The SnapVault update recognizes the deduplicated blocks as changed blocks. Thus, when deduplication is run on an existing SnapVault source for the first time, all saved space is transferred to the destination system.

• Question 136:

  Which MetroCluster configuration procedure is recommended for re-establishing a mirrored volume that was in a level-0 resynchronization state when it failed?

  A. Determine which volumes are at the remote and disaster sites.

  B. Re-create the synchronous mirror.

  C. Rejoin the two volumes.

  D. Turn on power to the cluster node at the disaster site.

  Correct Answer: B

  https://library.netapp.com/ecmdocs/ECMP1210206/html/GUID-A865DB95-9418-4ED2-A993- 74F347F674A0.html

  1.

  Validate that you can access the remote storage by entering the following command:

  aggr status -r

  Note: A (level-0 resync in progress) message indicates that a plex cannot be rejoined.

  2.

  Turn on the power to the node at the disaster site. After the node at the disaster site boots up, it displays the following:

  Waiting for giveback...(Press Ctrl-C to abort wait)

  3.

  If the aggregates at the disaster site are online, take them offline by entering the following command for each aggregate that was split:

  aggr offline disaster_aggr

  disaster_aggr is the name of the aggregate at the disaster site. Note: An error message appears if the aggregate is already offline.

  4.

  Destroy every target plex that is in a level-0 resync state by entering the following command:

  aggr destroy plex_name

  5.

  Re-create the mirrored aggregates by entering the following command for each aggregate that was split:

  aggr mirror aggr_name -v disaster_aggr

  aggr_name is the aggregate on the surviving site's node. disaster_aggr is the aggregate on the disaster site's node. The aggr_name aggregate rejoins the disaster_aggr aggregate to reestablish the MetroCluster configuration.

  6.

  Enter the following command at the partner node:

  cf giveback

  The node at the disaster site reboots.

• Question 137:

  Which statement is true about ASIS deduplication license with Data ONTAP 8.1?

  A. The existing 8.0 license key is used.

  B. A new license key is generated.

  C. The license is capacity-based.

  D. The license no longer exists.

  Correct Answer: D

  https://library.netapp.com/ecmdocs/ECMP1120690/html/frameset.html

  Changes to deduplication in 8.1 7-mode Starting with Data ONTAP 8.1, you can enable the deduplication feature without adding a license. For deduplication, no limit is imposed on the supported maximum volume size. The maximum volume size limit is determined by the type of storage system regardless of whether deduplication is enabled.

• Question 138:

  Using the output below, a co-worker determined that these are types "Solaris" LUNs. What would your destination be?

  lun show m LUN patch mapped to LUN ID ------------------------------------------------------- /vol/vol1/lun0 solaris igroup0 0 /vol/vol1/lun solaris- igroup1 0 /vol/vol1/qtree1/lun2 solaris igroup2 0 /vol/vol1/qtree1/lun3 solaris igroup3 0

  A. These are type "Solaris" LUNs.

  B. Not enough information is given here. Run the lun status command to get the information requested.

  C. Not enough information is given here. Run the lun show v command to get the information requested.

  D. Not enough information is given here. Run the lun map command to get the information requested.

  Correct Answer: C

• Question 139:

  Five minutes ago, you performed a single file SnapRestore on a large NFS file. 40% of your NFS users are now complaining about getting "stale file handles" for the file. Which is the most likely cause of this problem, and the best procedure

  to correct it?

  A. This might be due to an NFS storage system and client mismatch. Check to see that these users have the same version of the NFS client that existed at the time the snapshot was taken.

  B. NFS users why try to access a reverted file without first reopening it might get a "stale file handle" error message. Have the users try to reopen the file and see if the problem is resolved.

  C. After a single file SnapRestore, NFS users have to reboot their systems. Have them reboot their systems.

  D. These users are on a different subnet from the others. Start troubleshooting by checking their subnet.

  Correct Answer: B

  https://library.netapp.com/ecmdocs/ECMP1196991/html/GUID-35C9A4BA-02BA-4965-A366- 698C1299E29D.html

  Reverting a file to a selected Snapshot copy Using snap restore to revert a single file to a selected Snapshot copy is practical when the file is so large that you cannot copy the previous file version from the Snapshot copy to the active file system. Before you begin Ensure that you notify the network users before reverting a file so that they know that the current data in the file will be replaced by that of the selected Snapshot copy.

  Note: NFS users who try to access a reverted file without first reopening it might get a stale file handle error message after the volume reversion.

• Question 140:

  When viewing the output of the sysstat f command, which three fields are part of the output? (Choose three)

  A. FCP

  B. FTP

  C. CIFS

  D. NFS

  E. iSCSI

  Correct Answer: ACD

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

  sysstat [ -c count ] [ -s ] [ -u | -x | -m | -f | -i | -b ] [ -d ] [ interval ] -f For the default format display FCP statistics. The FCP default output format is as follows: CPU NFS CIFS FCP Net kB/s Disk kB/s FCP kB/s Cache in out read write in out age ###% ##### ##### ##### ##### ##### ##### ##### ##### ##### >##