NetApp NetApp Certifications NS0-155 Questions & Answers

• Question 151:

  What are two methods of protecting LUN overwrites using Snapshot copies on a volume with fractional reserve set to 0%? (Choose two)

  A. Snap Autodelete

  B. iGroup throttle

  C. LUN reset

  D. Volume AutoSize

  Correct Answer: AD

  https://communities.netapp.com/groups/chris-kranz-hardware-pro/blog/2009/03/05/fractional- reservation-- lunoverwrite

  From the article:

  "If you reduce the Fractional Reservation to 0, you need to make sure the rate of change is within the volume size, or you need to make sure the volume can auto-grow when required or even snap auto- delete to reduce the reserved blocks

  and free up space (although I am not a huge fan of snap auto-delete for various reasons)."

• Question 152:

  Which NetApp Storage Tier component works aggregate-wide on a FAS controller?

  A. Flash Pool

  B. Flash Disk

  C. Flash Cache

  D. Flash Accel

  E. Flash IO

  Correct Answer: A

  http://www.netapp.com/us/system/pdf-reader.aspx?m=ds-3177-0512.pdfandcc=us http://www.netapp.com/ us/products/platform-os/flashpool.aspx Flash Pool utilizes SSDs to enhance performance of disk aggregates. Flash Cache is a

  controller-attached PCIe intelligent caching solution.

  Flash Accel is a host-attached caching solution.

  Flash Disk and Flash IO are ambiguous terms.

• Question 153:

  Which NetApp Storage Tier component works controller-wide on a FAS controller?

  A. Flash Pool

  B. Flash Disk

  C. Flash Accel

  D. Flash Cache

  E. Flash IO

  Correct Answer: D

  http://www.netapp.com/us/system/pdf-reader.aspx?m=ds-3177-0512.pdfandcc=us http://www.netapp.com/ us/products/storage-systems/flash-cache/index.aspx? ref_source=ntp141p359372brg-c-26967a63-442e- c7e9-6a7300002efa4dd6andgclid=CLLdsqWKrbkCFS4aOgodb1AAuA

  Flash Cache is a controller-attached PCIe intelligent caching solution.

  Flash Accel is a host-attached caching solution.

  Flash Pool utilizes SSDs to enhance performance of disk aggregates (implicitly not controller-wide).

  Flash Disk and Flash IO are ambiguous terms.

• Question 154:

  UNIX allows file access based on___________.

  A. NT ACLs and UNIX permissions.

  B. NT ACLs and SID.

  C. GID or UID and UNIX permissions.

  D. GID or UID and ACLs.

  Correct Answer: C

  http://hd.kvsconsulting.us/netappdoc/801docs/html/ontap/smg/GUID-866DD79D-D2A6-4FBA- B0BDA63560FECEFF.html

  In OnTap 8.0, when UNIX security style is selected, only UNIX security objects can be used. The correct answer is GID, UID and UNIX permissions.

  Basic UNIX permissions are organized into three classes: user, group, and others. UNIX operating systems identify users with a numerical value: a user identifier, also known as a UID or User ID. Each user is a member of a group of the

  same name as the user. Like UIDs, groups (GIDs) are also specified using a numerical value.

• Question 155:

  When will a Volume SnapMirror (VSM) from a 64-bit source to a 32-bit destination volume fail?

  A. When the 64-bit volumes has Volume Guarantee disabled

  B. When the 64-bit volume has compression enabled

  C. When the 64-bit volume has FlexShare enabled

  D. When the 64-bit volume has ASIS enabled

  Correct Answer: B

  https://library.netapp.com/ecmdocs/ECMP1196986/html/GUID-87340429-8F4A-4AA6-B081- 0F5040089C78.html Data compression requires 64-bit aggregates.

• Question 156:

  What is the correct format for the scheduling component of a SnapVault schedule?

  A. cnt[@day_list][@hour_list]

  B. YYYY-MM-DD

  C. Crontable format

  D. List of dates in ISO Date format

  Correct Answer: A

  https://library.netapp.com/ecmdocs/ECMP1196979/html/man1/na_snapvault.1.html http:// www.geekyfacts.com/index.php?option=com_contentandview=articleandid=64:snapvault snapvault snap sched [ -f ] [ -x ] [ -o options ] [ volname

  [ snapname [ schedule ]]] schedule is cnt[@day_list][@hour_list] or cnt [@hour_list][@day_list] In the schedule, cnt tells SnapVault how many of the snapshots to keep for primaries and for non- SnapLock secondary volumes. The snapshots

  will be numbered newest to oldest from 0 to cnt-1. When creating a new snapshot, SnapVault will delete the oldest snapshots, increment by one the number on the remaining snapshots and then create a new number 0 snapshot. If a

  snapshot is missing from the sequence (e.g. sv.0, sv.1, and sv.3 exist but sv.2 does not), only snapshots that need to be renumbered to make room for the new sv.0 snapshot will be renumbered. In the example, sv.0 and sv.1 would be

  renamed to sv.1 and sv.2, but sv.3 would remain unchanged.

  The cnt in the schedule is interpreted differently for SnapVault secondary SnapLock volumes. For SnapLock secondary volumes, snapshots are created with a name that includes an encoded date and time of when the snapshot is created.

  These snapshots are never renamed and they are never automatically deleted. These snapshots may be deleted using snap delete after the retention period of the snapshot has expired. If cnt is 0, no snapshots will be taken. If cnt is any nonzero value, snapshots will be taken and no snapshots will be automatically deleted. If specified, the day_list specifies which days of the week the snapshot should be created. The day_list is a comma-separated list of the first three letters of

  the day:

  mon, tue, wed, thu, fri, sat, sun. The names are not case sensitive. Day ranges such as mon-fri can also be given. The default day_list is mon-sun, i.e. every day.

  If specified, the hour_list specifies which hours of the day the snapshot should be created, on each scheduled day. The hour_list is a comma-separated list of the hours during the day, where hours are integers from 0 to 23. Hour ranges such

  as 8-17 are allowed. Also, step values are allowed in conjuction with ranges. For example, 0-23/2 means "every two hours". The default hour_list is 0, i.e.

  midnight on the morning of each scheduled day.

• Question 157:

  Which Data ONTAP option sets system-wide for all transfers?

  A. Options transfers.wide.enable

  B. Options transfer.throttle.enable.

  C. Option replication.wide.enable

  D. Options replication.throttle.enable

  Correct Answer: D

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

  replication.throttle.enable Enables global network throttling of SnapMirror and SnapVault transfers.

  The default value for this option is off.

  replication.throttle.incoming.max_kbs

  This option specifies the maximum total bandwidth used by all the incoming (applied at destination) SnapMirror and SnapVault transfers, specified in kilobytes/sec. The default value for this option is unlimited, which means there is no limit on

  total bandwidth used. This option is valid only when the option replication.throttle.enable is on.

  replication.throttle.outgoing.max_kbs

  This option specifies the maximum total bandwidth used by all the outgoing (applied at source) SnapMirror and SnapVault transfers specified in kilobytes/sec. The default value for this option is unlimited, which means there is no limit on total

  bandwidth used. This option is valid only when the option replication.throttle.enable is on.

• Question 158:

  Which two commands can be used to enable LUN reservations? (Choose two)

  A. lun set reservation

  B. lun reservation set

  C. lun map

  D. lun create

  Correct Answer: AD

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

  lun set reservation lun_path [ enable | disable ]

  Enables or disables the space reservation on the LUN. If no arguments are supplied after the lun_path, then the space reservation status of the given lun_path is displayed. 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

  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.

  lun map [ -f ] lun_path initiator_group [ lun_id ]

  Maps a LUN to all the initiators in the supplied group. If a LUN ID is not specified, the smallest number that can be used for the various initiators in the group is automatically picked. Note that this command can be used multiple times to

  configure multiple maps for a LUN, or for an initiator group. Once created, you can use lun show -m to list all the LUN mappings. The optional -f argument disables checking with the HA partner for LUN mapping conflicts.

• Question 159:

  How does the NetApp Remote Agent (RSA) connect to NetApp Support?

  A. NetApp Support initiates a non-secure connection to the RSA.

  B. NetApp Support initiates a secure connection to the RSA.

  C. The RSA initiates a secure connection to NetApp Support.

  D. The RSA initiates a non-secure connection to NetApp support.

  Correct Answer: C

  https://library.netapp.com/ecm/ecm_download_file/ECMP1200040

  Remote Support Agent is the facility to provide NetApp Support Engineers with the ability to remotely trigger AutoSupport.

  Remote Support Agent uses HTTP or HTTPS to communicate with the storage controller to initiate commands and to collect files. It uses HTTPS to send system logs and core files from the Data ONTAP root volume to Remote Support Enterprise on the NetApp Support side. NetApp RSA is not related to the RSA public key encryption algorithm.

• Question 160:

  Which two will allow you to read and analyze a packet trace file generated by the storage system? (Choose two)

  A. WireShark

  B. Pktt

  C. Netmon

  D. Eternal View

  Correct Answer: AC

  pktt is part of the Data OnTap command set.

  The output of pktt is not very human-readable, but it utilizes the tcpdump format which many traffic analyzers can read or import. Only two such analyzers have been offered here.

  Wireshark is the successor of Etherreal, and available for several platforms. Netmon is a Microsoft project, available for Windows, soon to be deprecated by the Microsoft Message Analyzer project.