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Oracle Linux 6 Advanced System Administration

Question No: 51

What is the purpose of thekpartxcommand?

  1. It is a graphical XWindows application to manipulate kernel partition tables.

  2. It is a graphical XWindows application to manipulate partition tables on disk.

  3. It prints virtual disk partition tables.

  4. It manipulates and prints virtual disk partition tables.

  5. It creates device maps from partition tables.

Answer: E Explanation:

The kpartx command creates device maps from partition tables. Each guest storage image has a partition table embedded in the file

Question No: 52

Which two occur when you run the command: [root@FAROUT/root] rndc reload

  1. They key file/etc/rndc.keyis reloaded.

  2. The configuration file/etc/named.confis reloaded.

  3. Only new zones are reloaded.

  4. All zones are reloaded.

  5. Only changed zones are reloaded.

  6. Only new keys are reloaded.

  7. All keys are reloaded.

Answer: A,E

Question No: 53

You have a mounted mirroredbtrfsfile system in RAID-1 on/btrfs:

# btrfs filesystem show

Label: ‘Btrfs’uuid:7bfe3239-47ee-442b-b9f8-49f88b6b1be4 Total devices2 FS bytes used 250.46MB

devid2 size 4.88GB used 1.54GB path /dev/sdd devid1 size 4.88GB used 1.54GB path /dev/sdc You found an error on one device:

#btrfs scrub start -B -d -r /btrfs scrub device /dev/sdc (id 1) done

scrub started at Wed Aug 21 15:33:05 2013 and finished after 6 seconds total bytes scrubbed: 250.34MB with 0 errors

scrub device /dev/sdd (id2) done

scrub started at Wed Aug 21 15:33:05 2013 and finished after 6 seconds total bytes scrubbed: 250.39MB with 26 errors

error details: read=13 csum=13

corrected errors: 13, uncorrectable errors: 0, unverified errors: 0 Which statements repairs the corrupted blocks?

  1. fsck.btrfs -f /dev/sdd

  2. fsck -t btrfs /btrfs

  3. btrfs scrub/dev/sdc

  4. btrfs scrub start /dev/sdd

Answer: D

Question No: 54

Examine the D scrypt: syscall::read:entry, syscall::write:entry

/pid == $1/

{

ts[probefunc] = timestamp;

}

syscall::read:return, syscall::write:return

/pid == $1 amp;amp; ts[probefunc] != 0/

{

printf(“%d nsecs”, timestamp – ts[probefunc]);

}

Which statement is true about this script?

  1. It produces aggregations of system calls made by the process whose PID is passed as a command-line argument represented by $1. You see which system calls are issued, and how many times, over a fixed interval.

  2. It produces elapsed times for reads and writes to the entry and returns DTrace probes for the process whose PID is passed as a command-line argument represented by $1.

  3. It produces elapsed times between entry and return of read and write system calls for the process whose PID is passed as the first command-line argument to the D script, represented by $1.

  4. It produces a measure of useful time spent in read and write system calls for the process whose PID is passed as a command-line argument represented by $1.

Answer: A

Question No: 55

Examine the two commands and theoutput produced: [root@host03 ~]# iscsiadm -m session

iscsiadm: No active sessions. [root@host03 ~]# iscsiadm -m node

192.0.2.1:3260,1 iqn.2013-03.com.example.mypc:3

192.0.2.1:3260,1 iqn.2013-03.com.example.mypc:2

192.0.2.1:3260,1 iqn.2013-03.com.example.mypc:1

Which option represents the correct command or commands to establish iSCSI sessions with the target portal192.0.2.1:3260?

  1. iscsiadm-m session -1

  2. iscsiadm-m node -1

  3. iscsiadm-m discovery -t st -p 192.0.2.1 iscsiadm-m session -1

  4. iscsiadm-m discovery -t st -p 192.0.2.1 iscsiadm-m host -1

Answer: C

Question No: 56

What are two ways to invoke the rescue procedure for Oracle Linux while booting from the installation media?

  1. Press theEsckey on the Oracle Linux Boot Menu screen.

  2. Press theEsckey on thegrubloader menu.

  3. selecting “Rescue Installed System” on the Oracle Linux Boot Menu screen.

  4. selecting “Rescue Installed System” on thegrubloader menu.

  5. Press the Shift Ctrl keys on thegrubloader menu.

  6. Press the Shift Ctrl keys on the Oracle Linux Boot Menu screen.

Answer: C,F

Question No: 57

Which three statements are true aboutBtrfs copy -reflink?

  1. Itworks only on the samebtrfsfile system.

  2. It works only on the same subvolumes.

  3. It creates a new link pointing to an existing inode.

  4. It creates a new inode that shares the same disk blocks as the original.

  5. It creates a clone file and disk blocks are duplicated.

Answer: A,B,C

Reference:https://blogs.oracle.com/OTNGarage/entry/save_disk_space_on_linux

Question No: 58

Identify the two commands that can be used to set SELinux file labels back to their default values.

  1. chcon

  2. fixfiles

  3. semanage fcontext

  4. restorecon

  5. matchpathcon

  6. opdate_selinux

Answer: A,D

Question No: 59

What statement describes the iSCSI client system’s iSCSI database?

  1. The client maintains a text formatted file,/etc/iscsi/iscsi.db.

  2. The client can use either a local database in the form of a Berkeley DB formatted file in/etc/iscsior a distributed database in the form of Internet StorageNaming Service (iSNS) as its database. It is a decision for the System and StorageAdministration team.

  3. The client maintains a local database in the form of a directory tree structure in/var/lib/iscsi.

  4. The client maintains a local database in the form of a directory tree structure in/etc/iscsi/db.

Answer: A

Question No: 60

After creating empty mount point/xfs1, you execute the command:

# mkfs -t xfs -L /xfs1 -l logdev=/dev/sdd1 /dev/sdh1

Which two statements are true about the effects of executing themkfscommand?

  1. It fails if there is an existing XFS file system on/dev/sdh1.

  2. It fails if there is an existing XFS log on/dev/sdd1.

  3. It fails if there is an existing XFS file system on/dev/sdd1.

  4. It fails because there is no size specified for the XFS log.

  5. Thexfs1file system is mounted automatically during system startup.

  6. It creates and mounts the/xfs1file system.

Answer: D,F

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