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linux

RedHat / CentOS : Managing software RAID with mdadm

by admin

Basics mdadm (multiple devices admin) is an extremely useful tool for running RAID systems. It’s is a tool for creating, managing, and monitoring RAID devices using the md driver. It can be used as a replacement for the raidtools, or as a supplement. You can use whole disks (/dev/sdb, /dev/sdc) or individual partitions (/dev/sdb1, /dev/sdc1) […]

Filed Under: Linux Tagged With: linux, mdadm, software RAID

Beginners guide to Device Mapper (DM) multipathing

by admin

Multipathing Overview A path is a connection between a server and the underlying storage. The path can be severed due to many reasons like faulty HBA, faulty cable etc. To avoid such single point of failures, multipathing exists. Multipathing ensures that the system uses multiple physical paths to provide redundancy and increased throughput. There are […]

Filed Under: CentOS/RHEL 6, CentOS/RHEL 7, Linux Tagged With: device mapper multipathing, linux

CentOS / RedHat : Beginners guide to log file administration

by admin

The system log daemon is responsible for logging the system messages generated by applications or kernel. The system log daemon also supports the remote logging. The messages are differentiated by facility and priority. In principle, the logs handled by syslog are available in the /var/log/ directory on Linux system : # ls /var/log acpid cron.1 […]

Filed Under: Linux Tagged With: linux, log file administration, log rotate

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