interview questions on veritas volume manager

#Interview questions on veritas volume manager how to#
#Interview questions on veritas volume manager drivers#

All transmissions are sent on all slave interfaces. broadcast or 3 – Sets a broadcast mode for fault tolerance.balance-xor or 2 – Sets an XOR (exclusive-or) mode for fault tolerance and load balancing.

active-backup or 1 – Sets active-backup mode for fault tolerance.balance-rr or 0 – round-robin mode for fault tolerance and load balancing.Q:15 What are the different modes of Network bonding in Linux ?Īns: Below are the list of modes used in network bonding : Network bonding is also known as NIC Teaming. DHCP 67/UDP(dhcp server), 68/UDP(dhcp client)Īns: Network bonding is the aggregation of multiple lan cards into a single bonded interface to provide fault tolerance and high performance.FTP 20 (data transfer), 21 ( Connection established).Q:13 What are the default ports used for SMTP,DNS,FTP,DHCP,SSH and squid ? Restart the nfs service or ‘exportfs -arv’Īns: Using ‘showmount’ command we can see which directories are shared via nfs e.g ‘showmount -e ’.Using mount command we can mount the nfs share on linux machine.First edit the configuration file ‘/etc/exportfs’, add a entry like.

#Interview questions on veritas volume manager how to#

Q:11 How to share a directory using nfs ?

Mount the root file system in rw mode and then do chroot /sysroot.

Go to the end of line which starts with ‘linux’ and type ‘rd.break’ and hit enter.

Q:10 How to Boot RHEL / Rocky Linux / CentOS in Single User Mode ?Īns: Follow the beneath steps to boot RHEL / Rocky Linux / CentOS in single user mode: Q:9 How to set the umask permanently for a user?Īns: To set this value permanently for a user, it has to be put in the appropriate profile file which depends on the default shell of the user. Also with ‘lsmod’ command we can see all the installed kernel modules.Īns: umask stands for ‘User file creation mask’, which determines the settings of a mask that controls which file permissions are set for files and directories when they are created.

#Interview questions on veritas volume manager drivers#

Q:7 Where the kernel modules are located ?Īns: The ‘/lib/modules/kernel-version/’ directory stores all kernel modules or compiled drivers in Linux operating system.

Type ‘partprobe’ to instruct the kernel to re-read the partition table.

After creating partition, type w command to write the changes to the partition table.

fdisk /dev/hd* (IDE) or /dev/sd* (SCSI).

Q:6 How to create partition on the raw disk ?Īns: Using fdisk utility we can create partitions on the raw disk.

Now use the lvreduce command, e.g lvreduce -L 10G /dev/mapper/myvg-mylvĪbove Command will shrink the file system & will make the filesystem size 10 GB.

Use resize2fs command, e.g resiz2fs /dev/mapper/myvg-mylv 10G.

Umount the filesystem using umount command.

Q:5 How to reduce or shrink the size of LVM partition ?Īns: Below are the logical steps to reduce size of LVM partition :

check the size of partition using df command.

Use the lvextend command (lvextend -L +100M /dev/, in this example we are extending the size by 100MB.

Q:4 How to increase the size of LVM partition ? If CPU utilization is near 100 percent (user + nice + system), the workload sampled is CPU-bound.īy default log files of Sar command is located at /var/log/sa/sadd file, where the dd parameter indicates the current day. The default version of the sar command (CPU utilization report) might be one of the first facilities the user runs to begin system activity investigation, because it monitors major system resources. Q:3 What does Sar provides and at which location Sar logs are stored ?Īns: Sar collect, report, or save system activity information. Q:2 How to check memory stats and CPU stats ?Īns: Using ‘free’ & ‘vmstat’ command we can display the physical and virtual memory statistics respectively.With the help of ‘sar’ command we see the CPU utilization & other stats.