Category Archives: FileSystem

EXT4 vs XFS: large volumes with low-end RAID controller

Posted on January 12, 2012 by admin

Some months ago, I wrote an article comparing EXT3, EXT4, XFS and BTRFS filesystem performances with a Fedora 14 x86_64 installation done on a Dell Latitude D620 laptop. While the results were quite interesting (especially to evaluate BTRFS performance), they … Continue reading →

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alloc_sem of Ext4 block group

Posted on January 10, 2012 by admin

Yesterday Amir Goldstein sent me an email for a deadlock issue. I was in Chinese New Year vacation, could not have time to check the code (also I know I can not answer his question with ease). Thanks to Ted, … Continue reading →

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Debian / Ubuntu Linux: Setup NFSv4 File Server

Posted on September 13, 2011 by admin

How do I install and configure NFS version 4 server under Debian or Ubuntu Linux server operating systems using host-based authentication? You need to install the following packages in Debian / Ubuntu Linux server: nfs-kernel-server: Linux kernel NFS version 3 … Continue reading →

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RHEL / CentOS Linux: Mount and Access NTFS Partition

Posted on September 13, 2011 by admin

How to enable NTFS support on CentOS Linux version 5 or 6? How do I mount ntfs partition under RHEL 5 or 6? First, you need to install EPEL repo as described here. The following command will turn in EPEL … Continue reading →

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Linux 3.0 scrubs up Btrfs, gets more Xen

Posted on August 3, 2011 by admin

Linux 3.0 was released, featuring a storage backend for Xen virtualization and a scrubbed up antifrag version of the Btrfs filesystem. Meanwhile, Thomas Gleixner released a major new, real-time Linux patch to match Linux 3.0 for highly-deterministic applications. Timed for … Continue reading →

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Switching from GlusterFS to DRBD and OCFS2

Posted on November 19, 2010 by admin

As my uptime reports have shown, and as some of you have reported, my blog’s load time has increased steadily over the past few weeks. It turns out that one of my VM’s was on a physical machine that had … Continue reading →

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Setting Up An NFS Server And Client On OpenSUSE 11.3

Posted on September 17, 2010 by admin

This guide explains how to set up an NFS server and an NFS client on OpenSUSE 11.3. NFS stands for Network File System; through NFS, a client can access (read, write) a remote share on an NFS server as if … Continue reading →

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Creating An NFS-Like Standalone Storage Server With GlusterFS On Ubuntu 10.04

Posted on September 10, 2010 by admin

This tutorial shows how to set up a standalone storage server on Ubuntu 10.04. Instead of NFS, I will use GlusterFS here. The client system will be able to access the storage as if it was a local filesystem. GlusterFS … Continue reading →

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Updated snapadm.pl file for ZFS Snapshots

Posted on September 7, 2010 by admin

In my post OpenSolaris Backup Solution with Rsync and ZFS Snapshots I provided a link to a script from Sun – snapadm.pl. I found a bug where if you were using the recursive function then the old snapshots would never … Continue reading →

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GlusterFS on the cheap with Rackspace’s Cloud Servers or Slicehost

Posted on August 23, 2010 by admin

High availability is certainly not a new concept, but if there’s one thing that frustrates me with high availability VM setups, it’s storage. If you don’t mind going active-passive, you can set up DRBD, toss your favorite filesystem on it, … Continue reading →

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