Question : How To Check FC Brocade HBA Firmware in linux? Answer : You can use the “systool” command or else the file “/sys/class/scsi_host/host0/firmware_version” to check the firmware version of your Brocade FC HBA. Example: # systool -c fc_host -v | grep -i symbolic_name symbolic_name = “Brocade Brocade-415 FV2.0.0.0 DV2.0.0.0” or # cat /sys/class/scsi_host/host0/firmware_version 2.0.0.0 […]
Archives for June 2016
CentOS / RHEL 7 : How to start / Stop or enable / disable Firewalld
Question : How to Start or stop firewalld (iptables in earlier version) in CentOS / RHEL 7? Solution : The iptables service is replaced with firewalld service in Oracle Linux 7. The command iptables -L will list the set of rules that are in place on node. # iptables -L Chain INPUT (policy ACCEPT) target […]
CentOS / RHEL 6 : How to rebuild Initial Ramdisk Image
When adding new hardware to a system, or after changing configuration files that may be used earlier in the boot process, or when changing the options on a kernel module, it may be necessary to rebuild the initial ramdisk (also known as initrd or initramfs) to include the proper kernel modules, files, and configuration directives. […]
CentOS / RHEL 5 : How to rebuild Initial Ramdisk Image
When adding new hardware to a system, or after changing configuration files that may be used earlier in the boot process, or when changing the options on a kernel module, it may be necessary to rebuild the initial ramdisk (also known as initrd or initramfs) to include the proper kernel modules, files, and configuration directives. […]
RHEL / CentOS : How to rebuild LVM from Archive (metadata backups)
Problem : The filesystem was corrupted and the LVM volumes could not be mounted, with the lvm partitions are lost. Solution : Metadata backups and archives are automatically created on every volume group and logical volume configuration change unless disabled in the lvm.conf file. By default, the metadata backup is stored in the /etc/lvm/backup file […]