Oracle 1Z0-820 Online Practice Questions and Exam Preparation

Oracle 1Z0-820 Online Questions & Answers

• Question 11:

  You are troubleshooting the failure of a computer to mount an NFS file system hosted by a server (hostname mars) in the local area network.

  Select the three commands that will enable you to identify the problem.

  A. ping - s mars
  B. cat /etc/vfstab
  C. cat /etc/dfs/dfstab
  D. sharemgr show -v
  E. showmount -e mars
  F. rpcinfo -s mars | egrep `nfs|mountd'
  A. ping - s mars
  E. showmount -e mars
  F. rpcinfo -s mars | egrep `nfs|mountd'

  ---

  mount: mount-point /DS9 does not exist.

  To solve the mount point error condition, check that the mount point exists on the client. Check the spelling of the mount point on the command line or in the /etc/vfstab file (B) on the client, or comment outthe entry and reboot the system.

  Note: The /etc/vfstab file lists all the file systems to be automatically mounted at system boot time, with the exception of the /etc/mnttab and /var/run file systems.

  E: showmount This command displays all clients that have remotely mounted file systems that are shared from an NFS server, or only the file systems that are mounted by clients, or the shared file systems with the client access information. The command syntax is:

  showmount [ -ade ] [ hostname ]

  where -a prints a list of all the remote mounts (each entry includes the client name and the directory), -d prints a list of the directories that are remotely mounted by clients, -e prints a list of the files shared (or exported), and hostname selects the NFS server to gather the information from. If hostname is not specified the local host is queried.

  F: * mountd Daemon

  This daemon handles file-system mount requests from remote systems and provides access control. The mountd daemon checks /etc/dfs/sharetab to determine which file systems are available for remote mounting and which systems are

  allowed to do the remote mounting.

  * Commands for Troubleshooting NFS Problems

  These commands can be useful when troubleshooting NFS problems.

  rpcinfo Command

  This command generates information about the RPC service that is running on a system.

  Reference: man showmount

• Question 12:

  You have already generated a 256-bit AES raw key and named the keystore file /mykey. You need to use the key to create an encrypted file system.

  Which command should you use to create a ZFS encrypted file system named pool1/encrypt using the /mykey keystore?

  A. zfs create - o encryption = /mykey pool1/encrypt
  B. zfs create - o encryption = 256-ccm - o keysource = raw, file : ///my key pool1/encrypt
  C. zfs create - o encryption = AES keysource = /mykey pool1/encrypt
  D. zfs create - o encryption = on keystore = /mykey pool1/encrypt
  B. zfs create - o encryption = 256-ccm - o keysource = raw, file : ///my key pool1/encrypt

  ---

  Example: Encrypting a ZFS File System by Using a Raw Key

  In the following example, an aes-256-ccm encryption key is generated by using the pktool command and is written to a file, /cindykey.file.

  # pktool genkey keystore=file outkey=/cindykey.file keytype=aes keylen=256 Then, the /cindykey.file is specified when the tank/home/cindy file system is created.

  # zfs create -o encryption=aes-256-ccm -o keysource=raw,file:///cindykey.file tank/home/cindys

  Reference: Oracle Solaris ZFS Administration Guide, Examples of Encrypting ZFS File Systems

• Question 13:

  You need to set up an Oracle Solaris 11 host as an iSCSI target so that the host's disk can be accessed over a storage network. The disk device is c3t4d0.

  Which six options describe the steps that need to be taken on this host to enable an iSCSI target?

  A. Create a ZFS file system named iscsi/target.
  B. Create a zpool named iscsi with disk device c3t4d0
  C. Create zfs volume named iscsi/target.
  D. Use the stmfadm command to create a LUN using /dev/zvol/rdsk/iscsi/target.
  E. Use the stmfadm command to create a LUN using iscsi/target.
  F. Use the stmfadm command to make the LUN viewable.
  G. Use the stmfadm command to make the volume viewable.
  H. Enable the svc:/network/iscsi/target:default Service.
  I. Use the itadm command to create the iSCSI target.
  B. Create a zpool named iscsi with disk device c3t4d0
  C. Create zfs volume named iscsi/target.
  D. Use the stmfadm command to create a LUN using /dev/zvol/rdsk/iscsi/target.
  F. Use the stmfadm command to make the LUN viewable.
  H. Enable the svc:/network/iscsi/target:default Service.
  I. Use the itadm command to create the iSCSI target.

  ---

  How to Create an iSCSI LUN

  The following steps are completed on the system that is providing the storage device.

  1.Create a ZFS storage pool.

  Example: target# zpool create sanpool mirror c2t3d0 c2t4d0 (C)2. Create a ZFS volume to be used as a SCSI LUN.

  (D)3. Create a LUN for the ZFS volume.

  Example:

  target# stmfadm create-lu /dev/zvol/rdsk/sanpool/vol1 Logical unit created: 600144F0B5418B0000004DDAC7C10001

  4. Confirm that the LUN has been created.

  Example

  target# stmfadm list-lu

  LU Name: 600144F0B5418B0000004DDAC7C10001

  (F) 5. Add the LUN view.

  This command makes the LUN accessible to all systems.

  target# stmfadm add-view 600144F0B5418B0000004DDAC7C10001

  How to Create the iSCSI Target

  This procedure assumes that you are logged in to the local system will contains the iSCSI target.

  Note: The stmfadm command manages SCSI LUNs. Rather than setting a special iSCSI property on the ZFS volume, create the volume and use stmfadm to create the LUN.

  (H)

  1. Enable the iSCSI target service.

  target# svcadm enable -r svc:/network/iscsi/target:default

  (I)

  2. Create the iSCSI target.

  target# itadm create-target

  Reference: Oracle Solaris Administration: Devices and File Systems, Configuring iSCSI Devices With COMSTAR

• Question 14:

  You want the system to generate core files when an application crashes, but you want only root to be able to view the core files. The current core configuration is: global core file pattern: /var/core/core %f.%p global core file content: default init core file pattern: /var/core/pprocess/core.%f.%pp init core file content: default global core dumps: enabled per--process core dumps: enabled global setid core dumps disabled per-process setid core dumps: disabled global core dump logging disabled Select the option that describes the change that needs to be made to the core dump configuration to meet this requirement.

  A. coreadm --d process
  B. coreadm -i /var/core/core.%f %p
  C. coreadm--d global
  D. coreadm -d process -d global -e global-setid -e proc-setid
  E. Make this change to the /etc/coreadm.conf file: per-process core dumps: disabled
  A. coreadm --d process

• Question 15:

  The current ZFS configuration on serverA is: Pool1 c3t2d0 c3t3d0 Pool2 c3t4d0 c3t5d0

  The ZFS configuration on serverB is: Pool1

  mirror-0

  c3t2d0

  c3t3d0

  mirror-1

  c3t4d0

  c3t5d0

  You need to change serverA's ZFS configuration to match serverB's configuration.

  Which option should you choose to modify the configuration on serverA so that it matches serverB's configuration?

  A. zpool destroy pool2 zpool attach pool1 c3t4d0 ct3t5d0
  B. zpool destroy pool2 zpool attach pool1 c3t2d0 c3t2d0 c3t4d0 c3t5d
  C. zpool destroy pool2 zpool add pool1 c3t4d0 c3t5d0
  D. zpool destroy pool2 zpool mirror pool1 pool2
  E. zpool destroy pool2 zpool attach pool1 c3t2d0 c3t4d0 zpool attach pool1 c3t3d0 c3t5d0
  F. zpool destroy pool1 zpool destroy pool2 zpool create pool1 mirror c3t2d0 c3t3d0 c3t4d0 c3t5d0
  F. zpool destroy pool1 zpool destroy pool2 zpool create pool1 mirror c3t2d0 c3t3d0 c3t4d0 c3t5d0

  ---

  We destroy both pools. Then we recreate the mirror.

  Note: zpool attach [-f] pool device new_device Attaches new_device to an existing zpool device. The existing device cannot be part of a raidz configuration. If device is not currently part of a mirrored configuration, device automatically transforms into a two-way mirror of device and new_device. If device is part of a two-way mirror, attaching new_device creates a three-way mirror, and so on. In either case, new_device begins to resilver immediately. Reference: man zpool

• Question 16:

  You need to migrate a UFS file system named /production_ufs to a ZFS file system named /production_ufs. The /production_ufs file system cannot be taken down or be out of production during the migration, and the current /production_ufs file system must remain active until the /ptoduction_zfs file system is copied and ready.

  Which method allows you to meet both requirements?

  1.

  Copy live data from /production_ufs to /production_zfs while /production_ufs is in use.

  2.

  When the copy is complete, /production_zfs will contain an up-to date copy of /production_ufs

  A. Create a snapshot of the UFS file system. Create the new ZFS file system. Use cpio to copy data from the snapshot to the new ZFS file system.
  B. Create a new Boot Environment. Create the ZFS file system. Use lucreate -m to copy data from the Current UFS file system to the new ZFS file system.
  C. Mirror the existing UFS file system by using SVM. After both submissions are in sync, migrate one of the submissions to a ZFS file System by using Live Upgrade.
  D. Create the new ZFS file system by using zfs create import to import data from the existing UFS file system into the new ZFS file system
  E. Create the new zfs file system by using the zfs create -o shadow.
  E. Create the new zfs file system by using the zfs create -o shadow.

  ---

  Migrating Data With ZFS Shadow Migration ZFS shadow migration is a tool you can use to migrate data from an existing file system to a new file system. A shadow file system is created that pulls data from the original source as necessary.

  You can use the shadow migration feature to migrate file systems as follows:

  *

  A local or remote ZFS file system to a target ZFS file system

  *

  A local or remote UFS file system to a target ZFS file system

  Shadow migration is a process that pulls the data to be migrated:

  *

  Create an empty ZFS file system.

  *

  Set the shadow property on an empty ZFS file system, which is the target (or shadow) file system, to point to the file system to be migrated.

  For example:

  # zfs create -o shadow=nfs://system/export/home/ufsdata users/home/shadow2

  *

  Data from file system to be migrated is copied over to the shadow file system.

  Reference: Transitioning From Oracle Solaris 10 to Oracle Solaris 11, Migrating Data With ZFS Shadow Migration

• Question 17:

  You are going to create live zones on you server. Disk space is critical on this server so you need to reduce the amount of disk space required for these zones. Much of the data required for each of these zones is identical, so you want to eliminate the duplicate copies of data and store only data that is unique to each zone.

  Which two options provide a solution for eliminating the duplicate copies of data that is common between all of these zones?

  A. Create the zones by using sparse root zones.
  B. Set the dedup property to on and the dedupratio to at least 1.5 for the zpool. Create a separate ZFS file system for each zone in the zpool.
  C. Put all of the zones in the same ZFS file system and set the dedupratio property for the ZFS file system to at least 1.5.
  D. Put all of the zones in the same ZFS file system and set the dedup property for the file system to on.
  E. Put each zone in a separate ZFS file system within the same zpool. Set the dedup property to on for each ZFS file system.
  D. Put all of the zones in the same ZFS file system and set the dedup property for the file system to on.
  E. Put each zone in a separate ZFS file system within the same zpool. Set the dedup property to on for each ZFS file system.

  ---

  n Oracle Solaris 11, you can use the deduplication (dedup) property to remove redundant data from your ZFS file systems. If a file system has the dedup property enabled, duplicate data blocks are removed synchronously. The result is that only unique data is stored, and common components are shared between files.

• Question 18:

  You have set up the task.max-lwps resource control on your Solaris 11 system.

  Which option describes how to configure the system so that syslogd notifies you when the resources control threshold value for the task.max-lwps resource has been exceeded?

  A. Use the rctladm command to enable the global action on the task.max-lwpa resource control.
  B. Modify the /etc/syslog.conf file to activate system logging of all violations of task.max- lwps and then refresh then svc: /system/system-log:default service.
  C. Activate system logging of all violations of task.max-lwpp in the /etc/rctldm.conf file and then execute the rctladm-u command.
  D. Use the prct1 command to set the logging of all resource control violations at the time the task.max-lwps resource control is being setup.
  E. Use the setrct1 command to set the logging of all resource control violations for the task.max-lwps resource control.
  A. Use the rctladm command to enable the global action on the task.max-lwpa resource control.

  ---

  rctladm - display and/or modify global state of system resource controls The following command activates system logging of all viola- tions of task.max-lwps. # rctladm -e syslog task.max-lwps

  # Reference: man rctladm

• Question 19:

  Identify three options that describe the new Oracle Solaris 11 zone features.

  A. There are boot environments for zones.
  B. Administrators can delegate common administration tasks by using RBAC.
  C. Oracle Solaris 11 supports Solaris 8, 9, and 10 branded zones.
  D. You can migrate a physical Solaris 10 system and its non-global zones to a solaris10 branded zone running on an Oracle Solaris 11 system.
  E. It is possible to change the host ID of a zone.
  A. There are boot environments for zones.
  B. Administrators can delegate common administration tasks by using RBAC.
  D. You can migrate a physical Solaris 10 system and its non-global zones to a solaris10 branded zone running on an Oracle Solaris 11 system.

  ---

  A: The beadm utility includes support for creating and administering non- global zone boot environments.

  Note: A boot environment is a bootable instance of the Oracle Solaris operating system image plus any other application software packages installed into that image. System administrators can maintain multiple boot environments on their

  systems, and each boot environment can have different software versions installed.

  B: Role-based access control (RBAC) is a security feature for controlling user access to tasks that would normally be restricted to the root role. By applying security attributes to processes and to users, RBAC can divide up superuser

  capabilities among several administrators.

• Question 20:

  The core dump configuration for your system is:

  

  A user is running a process in the global zone and the process crashes. The process information is:

  User1 2663 2618 0 17:46:42 pts/2 0:00 /usr/bin/bash

  The server host name is: zeus

  What will the per-process core file be named?

  A. core.bash.2663.global
  B. core.bash.2663.zeus
  C. /var/core/core.bash.2663
  D. /var/core/core.bash.2663.global
  C. /var/core/core.bash.2663

  ---

  Note the first line:

  global core file pattern: /globalcore/core.%f.%p

  The program name is bash

  The runtime process ID is 2663

  Note: By default, the global core dump is disabled. You need to use the coreadm command with the -e global option to enable it. The -g option causes the command to append the program name(%f) and the runtime process ID (%p) to the

  core file name.

  Reference: Core Dump Management on the Solaris OS