Category Archives: Storage

Back-up of /home of a running system using lv snapshot

By | October 21, 2017

Following is a simple and easy way to do a consistent back-up of the /home directory (usually mounted in a separate partition) on a running system. We do not have the luxury of being able to stop the operations of a server and unmount the home partition to make sure no changes are done during… Read More »

Validate and Investigate a live #DRBD replicated Oracle Instance using LVM clone

By | October 19, 2017

This is another post related to the DRBD replication setup I describe in post #DRBD based disk replication of a production cluster to a remote site cluster on RHEL 6. Sometimes we need to be able to mount the offline replicated Oracle database instance for investigations. This can be done by using logical volume snapshots.… Read More »

Linux Cluster with #DRBD replication: solving “HA LVM requires Only one logical volume per volume group” issue

By | April 24, 2017

I have a RHEL 6 Linux cluster setup where the main database storage is replicated on a remote site using DRBD. In case of a failure of the primary site the decision is taken to move operations on the remote site. When the production site is back online sometimes the administrator is too eager to… Read More »

Storage: Optimize SSDs with fstrim

By | January 10, 2017

Using SSD drives is no longer an exception, they are used in home systems but also in server systems to hold at least the OS, or other resources that need more speed than space. As any other storage disk a SSD can become fragmented as successive write/delete operations will try to use the available storage.… Read More »

#DRBD: Synchronization of sites after the failed DR (disaster recovery) site is recovered

By | April 24, 2017

This is a follow-up tutorial on the DRBD replication posts about resynchronization of sites after the failed DR site is recovered. More than a year ago I described in a long tutorial how to use DRBD in a real production environment and the challenges associated to it. See: DRBD based disk replication of a production… Read More »