Category: Linux Disk Management

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Linux Admin Reference – Understand Device Mapper and DM-Multipath – Red Hat Enterprise Linux

Device-mapper is a very important component of Linux 2.6 kernel. It is used for many critical storage related applications, such as LVM2, Linux native multipath tool device-mapper-multipath, device-mapper software RAID, etc. A solid understanding of device-mapper helps system administrators to investigate various kinds of issues with...

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Linux – Online configuration of new SAN disks to create new sybase raw volumes, using LVM.

As part of regular System Admin task we were asked to configure new storage to an existing sybase server without disturbing the existing storage and expecting no downtime for the existing production server. All necessary storage LUNS were already allocated by the Storage team as mentioned...

0

Linux : Identifying Disk Errors in Linux

Below procedure can be used to identify the hard disk errors in linux operating system. Execute the following command to identify the available disk configuration   # /bin/more /proc/scsi/scsi Output will include all the currently available disks to the linux, and the output vary depending on...

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Linux Admin Reference – Device Mapper Multipath ( DM-Multipath) Configuration – Red Hat Enterprise Linux 6

In Enterprise Linux Environment, External storage often permits devices to be accessed by multiple physical paths. This improves redundancy and availability. SAN environment Red Hat Enterprise Linux provides the device-mapper-multipath component to manage multipath capable storage and to present multipath devices to applications running on the...

0

Working with kpartx Command in Red Hat Enterprise Linux

This tool, derived from util-linux’ partx, reads partition tables on specified device and create device maps over partitions segments detected. It is called from hotplug upon device maps creation and deletion. kpartx [-a | -d | -l] [-v] wholedisk Usage Example To mount all the partitions...

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Working with mdadm Command in RHEL7

Introduction RAID devices are virtual devices created from two or more real block devices. This allows multiple devices (typically disk drives or partitions thereof) to be combined into a single device to hold (for example) a single filesystem. Some RAID levels include redundancy and so can...

Linux Administration Information Center

Booting Tasks Read – Unexpected Server Reboots of RHEL servers on HP Read – Linux Admin Reference – RedHat Linux Grub Loader Storage Responsibilities Read – Understand Device Mapper and DM-Multipath Read – Identifying Disk Errors in Linux Read – Identify if linux was installed on...

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Linux Admin Reference – SUDO Configuration in RedHat Enterprise Linux

Sudo is different from the su command and is more flexible and more secure. The sudo command allows users to do tasks on a Red Hat Enterprise Linux system as another user. One significant advantage is that it can log usage. By default the program saves...

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