Daily Archives: March 24, 2019

mysql 8.0 task list

# mysql [-h hostname] -u root -p Create a database mysql> create database [databasename]; List all databases . mysql> show databases; Switch to a database mysql> use [db name]; List tables in the db. mysql> show tables; To see database’s […]

OpenZFS: ZFS on RHEL 7 CentOS 7

OpenZFS is the open source implementation of ZFS which is an advanced and highly scalable storage platform. Although ZFS was originally designed for Sun Solaris, you can use ZFS on most of major Linux distributions with the help of the […]

ZFS on RHEL7 CentOS 7

ZFS, the short form of Zettabyte Filesystem is an advanced and highly scalable filesystem. It was originally developed by Sun Microsystems and is now part of the OpenZFS project. With so many filesystems available on Linux, it is quite natural […]

Installing ZFS on RHEL 7 CentOS 7

Instructions By default, ZFS is not available in the standard CentOS repository. We will need to include some 3rd party repositories here. sudo rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm sudo rpm -Uvh http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm sudo rpm -Uvh https://forensics.cert.org/cert-forensics-tools-release-el7.rpm sudo rpm -Uvh http://download.zfsonlinux.org/epel/zfs-release.el7_6.noarch.rpm sudo yum […]

ZFS Performance: Mirror vs RAIDZ vs RAIDZ2 vs RAIDZ3 vs Striped

Performance difference among different ZFS types, such as mirror, RAIDZ, RAIDZ2, RAIDZ3, Striped, two RAIDZ vdevs vs one RAIDZ2 vdev etc… Background CPU: Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz / quard cores / 8 threads OS: CentOS Linux release 7.3.1611 […]

How to fix ZFS after updating to a newer kernel

Step 1: Clean up and Reinstall DKMS Modules Most of the time, the ZFS on Linux messes up the DKMS modules after the update. I suggest to clean up and reinstall DKMS modules once again. As of December 12, 2018, […]

Improving ZFS performance

A Good 64-bit CPU + Lots of Memory Traditionally, we are told to use a less powerful computer for a file/data server. That’s not true for ZFS. ZFS is more than a file system. It uses a lot of resources […]