NS0-155 Exam Dumps - Data ONTAP 7-Mode Administrator

http://www.netapp.com/us/system/pdf-reader.aspx?m=ds-3366.pdf &cc=us

Flash Accel utilizes server-based flash storage as cache for the host.

https://library.netapp.com/ecmdocs/ECMP1196991/html/GUID-D4D7C7F0-9063-4099-B5CA-8FEE619EEF1D.html

SyncMirror is a feature of Data OnTap used to mirror data to two separate aggregates. It allows for real-time mirroring of data to matching aggregates physically connected to the same storage system.

SyncMirror provides for synchronous mirroring of data, implemented at the RAID level. You can use SyncMirror to create aggregates that consist of two copies of the same WAFL file system. The two copies, known as plexes, are simultaneously updated. Therefore, the copies are always identical. The two plexes are directly connected to the same system.

The following provides information about the activities of SyncMirror:

SyncMirror can be used to mirror aggregates and traditional volumes. (A traditional volume is essentially an aggregate with a single volume that spans the entire aggregate.)

SyncMirror cannot be used to mirror FlexVol volumes. However, FlexVol volumes can be mirrored as part of an aggregate.

SyncMirror is different from synchronous SnapMirror.

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)."

http://www.netapp.com/us/system/pdf-reader.aspx?m=ds-3177-0512.pdf &cc=us

http://www.netapp.com/us/products/storage-systems/flash-cache/index.aspx?ref_source=ntp141p359372brg-c-26967a63-442e-c7e9-6a73-00002efa4dd6 &gclid=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.

https://library.netapp.com/ecmdocs/ECMP1196991/html/GUID-75BD4540-A103-4E2B-8B0A-E6BBC0D3F43F.html

http://backdrift.org/man/netapp/man5/na_snapmirror.conf.5.html

Two multipath methods are supported:

The multiplexing mode causes snapmirror to use both paths at the same time. If one should fail, it will switch to use the remaining path only and use both again should the failing path be repaired.

Failover mode causes snapmirror to use the first path as the desired path and only use the second path should problems arise with the first path.

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.

All the network ports should be assigned correct port roles, and all the network ports should be in the same subnet.

https://library.netapp.com/ecm/ecm_download_file/ECMP1196907

iscsi status - displays current status of the iSCSI service.

http://wafl.co.uk/iscsi/#sthash.GzOHA2Tj.dpuf

https://communities.netapp.com/servlet/JiveServlet/previewBody/4791-102-2-13466/tr-3466.pdf

Pg 17

OSSV hosts listen for communications from NDMP manager applications on port 10000 by default.

Open Systems Snap Vault runs on servers, so the objects that can be selected for backup will be host-based.

Qtrees are objects on the storage system.

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

fcp show initiator [ -v ] [ adapter ]

If no adapter name is given, information about all initiators connected to all adapters are shown.

The command displays the portname of initiators that are currently logged in with the Fibre Channel target adapters. If the portname is in an initiator group setup through the igroup command, then the group name is also displayed. Similarly, all aliases set with the fcp wwpn-alias command for the portname are displayed as well.

If the -v flag is given, the command displays the Fibre Channel host address and the nodename/portname of the initiators as well.

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

###% ##### ##### ##### ##### ##### ##### ##### ##### ##### >##

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

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

-s

Display a summary of the output columns upon termination, descriptive columns such as `CP ty' will not have summaries printed. Note that, with the exception of `Cache hit', the `Avg' summary for percentage values is an average of percentages, not a true mean of the underlying data. The `Avg' is only intended as a gross indicator of performance. For more detailed information use tools such as na_nfsstat, na_netstat, or statit.

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

nfs.per_client_stats.enable

Enables/disables the collection and display of perclient NFS statistics, as described in na_nfsstat(1). Valid values for this option are on or off. The default value for this option is off.

https://library.netapp.com/ecmdocs/ECMP1196890/html/man1/na_ifstat.1.html

ifstat - display device-level statistics for network interfaces

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.

After you revert a volume to a selected Snapshot copy, you lose all the Snapshot copies that were taken after the selected Snapshot copy.

https://library.netapp.com/ecmdocs/ECMP1196991/html/GUID-80FEDAF8-75FA-4E43-B683-58C1F66B61E2.html

http://www.redbooks.ibm.com/redpapers/pdfs/redp4268.pdf

When you are using SnapVault in combination with Volume SnapMirror, it is important to understand their relationship with Snapshot. You cannot utilize SnapVault to protect a Volume SnapMirror destination, because SnapVault and SnapMirror both use the same Snapshot copies; they cannot run simultaneously. Schedules must be managed to accommodate the interlock that keeps SnapVault and SnapMirror from stepping on each other.

Both ‘warn you that there are no available spares from the proper pool’ and ‘halt after 24 hours if spare disk are not added to the proper pool’ are correct answers. However, since Data ONTAP alerts you first, 'warn you that there are no available spares' is the best answer.

https://library.netapp.com/ecm/ecm_download_file/ECMP1196912

https://communities.netapp.com/servlet/JiveServlet/previewBody/4803-102-1-6405/tr-3548.pdf

It is important to remember that this is the case only when a complete site is lost. In the case of a failed controller at one of the sites, a normal cluster failover occurs. Due to the operation of SyncMirror, there is also added protection from multidrive or complete shelf failures. When a storage controller fails in an active-active configuration, the partner detects the failure and automatically (if enabled) performs a takeover of the dataserving responsibilities from the failed controller. Part of this process relies on the surviving controller being able to read information from the disks on the failed controller. If this quorum of disks is not available, then automatic takeover won’t be performed. In a MetroCluster configuration, manually executing a single command will allow a takeover to occur in spite of the lack of a quorum of disks. This "forced takeover" process breaks the mirrored relationships in order to bring the failed controller’s volumes on line.

forcetakeover -d is very dangerous. Not only can it cause data corruption, if not used carefully, it can also lead to a situation where both the node and its partner are operational (split brain). As such, it should only be used as a means of last resort when the takeover and forcetakeover commands are unsuccessful in achieving a takeover. The operator must ensure that the partner node does not become operational at any time while a node is in a takeover mode initiated by the use of this command. In conjunction with RAID mirroring, it can allow recovery from a disaster when the two nodes in the HA pair are located at two distant sites.