In the last posts in this little series we looked at how to get a ZFS file system up and running on a CentOS 7 host and how snapshots and clones can be used to simply processes such as testing and cloning PostgreSQL instances. In this post we’ll look at another feature of zfs: Compression. The current status of my…
In the last post we looked at how to get a ZFS file system up and running on a CentOS 7 host and how to enable the auto mount of the ZFS file systems. In this post we’ll look at two of the features ZFS provides: Snapshots and clones. A ZFS snapshot is a read only copy of a file…
ZFS for Solaris is around for several years now (since 2015). But there is also a project called OpenZFS which makes ZFS available on other operating systems. For Linux the announcement for ZFS being production ready was back in 2013. So why not run PostgreSQL on it? ZFS provides many cool features including compression, snapshots and build in volume management.…
In this article we’ll going to explore on how to extend a partition which resides in a Logical Volume. LVM (Logical Volume Manager) is a great tool for managing your storage devices on a Linux host. Lets start with some vocabulary. In the order of the lowest layer (hard disks) towards the highest layer (the file system): Your hard disks…
We discovered a strange behavior in the Alert Log when the Fast Recovery Area (FRA) is full and the database wants to write something inside it (for example an archivelog). This case concern Oracle 11.2.0.3 databases and higher. Here is a demo with a 12c database (12.1.0.2) : First, to reproduce the behavior, I set a very small size to the FRA :…
