Reset HBA port in Linux

There are several commands available that allow you to reset one or more interconnects in Linux, issue_lip is one and the most recommended command. The following command can be used to find HBA device name.(in this example host1,host2): [root@unixonline ~]# systool -c fc_host -v|egrep “Device =|node_name|port_state|speed” Class Device = “host1” node_name = “0x20000032fff8dce3” port_state = … Read more

Monitoring Swap Usage for Each Process With the top Command

To monitor which process is using swap, you can use the top command:Log in to Advanced shell (bash).Type the following command to enter the top utility: # top [root@unixonline]# top top – 01:10:24 up 230 days, 9:05, 9 users, load average: 0.00, 0.01, 0.05 Tasks: 220 total, 1 running, 219 sleeping, 0 stopped, 0 zombie … Read more

How to do tape device discovery for NetBackup device configuration from RHEL Linux command line

How-To Steps: Scan and discover SCSI devices in Linux cli: scsi-rescan OR: ls -l /sys/class/scsi_host/echo “- – -” > /sys/class/scsi_host/host0/scanecho “- – -” > /sys/class/scsi_host/host1/scanecho “- – -” > /sys/class/scsi_host/host2/scanecho “- – -” > /sys/class/scsi_host/host3/scanecho “- – -” > /sys/class/scsi_host/host4/scanecho “- – -” > /sys/class/scsi_host/host5/scanecho “- – -” > /sys/class/scsi_host/host6/scan The commands to scan and … Read more

Recovering rebooted or crashed GlusterFS

checking glusterfs configurations: [root@glustertest1 ~]# gluster volume info Volume Name: test_volType: DisperseVolume ID: b23f6c11-8dfe-4d51-919d-35a30dd75100Status: StoppedSnapshot Count: 0Number of Bricks: 1 x (4 + 2) = 6Transport-type: tcpBricks:Brick1: glustertest1:/glusterfs/brick1Brick2: glustertest2:/glusterfs/brick1Brick3: glustertest3:/glusterfs/brick1Brick4: glustertest4:/glusterfs/brick1Brick5: glustertest5:/glusterfs/brick1Brick6: glustertest6:/glusterfs/brick1Options Reconfigured:transport.address-family: inetnfs.disable: on[root@glustertest1 ~]# [root@glustertest1 ~]# gluster volume statusVolume test_vol is not started if its not started: mount glusterFS: [root@glustertest1 ~]# mount … Read more

Rename a GlusterFS Peer in RHEL

Here are the steps:FYI, its not required to detach the peer. WARNING: Before proceed be sure of backup your data, and proceed with caution. Do not execute any command without understanding what it do exactly, be sure that you are in the correct path, make the correct names replacements in each command if apply (indicated … Read more

Install VectorWise DB on RHEL/CENTOS

Actian Vector (formerly known as VectorWise) is an SQL relational database management system designed for high performance in analytical database applications. It published record breaking results on the Transaction Processing Performance Council’s TPC-H benchmark for database sizes of 100 GB, 300 GB, 1 TB and 3 TB on non-clustered hardware. For Installing Vectorwise DB, download/Untar vectorwise DB binary file and start … Read more

Install and Configure Chrony server(NTP) for time adjustment in RHEL/Centos

### Install Chrony. [root@testos ~]# yum -y install chrony ### Edit/Update Chrony Configuration file [root@testos ~]# vi /etc/chrony.conf ### line 3: change servers for synchronization #server 0.centos.pool.ntp.org iburst #server 1.centos.pool.ntp.org iburst #server 2.centos.pool.ntp.org iburst #server 3.centos.pool.ntp.org iburst server <NTP1 SERVER ADDRESS> iburst server <NTP2 SERVER ADDRESS> iburst server <NTP3 SERVER ADDRESS> iburst ### line 25: … Read more

Install and Configure NTP server for time adjustment in RHEL/Centos

### Install NTPd. [root@testos ~]# yum -y install ntp ### Edit/Update NTP Configuration file [root@testos ~]# vi /etc/ntp.conf ### line 18: add the network range you allow to receive requests restrict 10.0.0.0 mask 255.255.255.0 nomodify notrap ### change servers for synchronization ### change servers for synchronization #server 0.centos.pool.ntp.org iburst #server 1.centos.pool.ntp.org iburst #server 2.centos.pool.ntp.org iburst … Read more

Public Yum Server for Oracle Linux 6,7

There is no yum repository in Oracle Linux after installation, so it’s necessary to set it in order to update the system with yum command. Oracle provides public yum server and we can use it for free to set. ⇒ Public Yum Server : http://public-yum.oracle.com/ ### Download repository file [root@testos ~]# cd /etc/yum.repos.d/ ### Oracle … Read more

Adjusting VMware ESX host Time Zone(and DST)

Details: During installation, a time zone was selected for an ESX host that does not match the desired time zone. This article provides steps to change the time zone or daylight-saving. Note: An ESX host with an incorrect date and time or time zone passes on that incorrect information. When a virtual machine boots up … Read more