How To Measure Linux Filesystem I/O Performance With iozone
IOzone is a filesystem benchmark tool. The benchmark generates and measures a variety of file operations. Iozone has been ported to many systems and runs under many operating systems including Windows,...
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CentOS / Red Hat Enterprise Linux 5.2 Poor NFS Performance and Solution
A few days ago I noticed that NFS performance between a web server node and NFS server went down by 50%. NFS was optimized and the only thing was updated Red Hat kernel v5.2. I also noticed same trend...
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Seagate Barracuda: 1.5TB Hard Drive Launched
Wow, this is a large size desktop hard disk for storing movies, tv shows, music / mp3s, and photos. You can also load multiple operating systems using vmware or other software for testing purpose....
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RAID 5 vs RAID 10: Recommended RAID For Safety and Performance
A Redundant Array of Independent Drives (or Disks), also known as Redundant Array of Inexpensive Drives (or Disks) (RAID) is an term for data storage schemes that divide and/or replicate data among...
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Linux VMWare Server 2: Start / Stop VMs From a Shell Prompt
You can easily start / stop / pause or take a snapshot from a shell prompt under a Linux / Windows host using vmrun command. This is useful if you do not want to run web interface for starting and/or...
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Linux tgtadm: Setup iSCSI Target ( SAN )
Linux target framework (tgt) aims to simplify various SCSI target driver (iSCSI, Fibre Channel, SRP, etc) creation and maintenance. The key goals are the clean integration into the scsi-mid layer and...
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Parallel NFS: Read / Write Hundreds of Gigabytes Per Second
NFS is pretty old file sharing technology for UNIX based system and storage systems. However, it suffers from performance issues. NFSv4.1 address data access issues by adding a new feature called...
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mount forcedirectio: Disable Linux CIFS / NFS Client Caching
If your network is heavily loaded you may see some problem with Common Internet File System (CIFS) and NFS under Linux. By default Linux CIFS mount command will try to cache files open by the client....
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Linux: Should You Use Twice the Amount of Ram as Swap Space?
Linux and other Unix-like operating systems use the term "swap" to describe both the act of moving memory pages between RAM and disk, and the region of a disk the pages are stored on. It is common to...
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Linux: Boot a 2TB+ partition or Larger Array Using Grub
I've already written about creating a partition size larger than 2TB under Linux using GNU parted command with GPT. In this tutorial, I will provide instructions for booting to a flat 2TB or larger...
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Top 10 Linux Virtualization Software
Virtualization is the latest buzz word. You may wonder computers are getting cheaper every day, why should I care and why should I use virtualization? Virtualization is a broad term that refers to the...
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VMWare ESX4 and ESX3.5: SCSI timeout For Linux Guest
Recently, I noticed that the timeout values differ on CentOS v5.x and RHEL Linux 5.x guests on VMWare ESX4 and ESX3.5.
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Linux Convert ext3 to ext4 File system
Some time ago ext4 was released and available for Linux kernel. ext4 provides some additional benefits and perforce over ext3 file system. You can easily convert ext3 to ext4 file system. The next...
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Oracle To Purchase Sun Microsystems for $7.4b
Look like combined company will give a tough time to both IBM and HP. Sun Microsystems and Oracle Corporation announced yesterday that they have entered into a definitive agreement under which Oracle...
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Poll: Common Causes Of Downtime In Your Data Center
Unplanned downtime may be the result of a software bug, human error, equipment failure, power failure, and much more. Last week was a bad one. We faced three different downtime:First, there was a...
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Increase Your VMware Virtual Hard Disk Size ( vmdk file )
I've Windows Vista installed as a guest under Ubuntu Linux using VMWARE Workstation 6.0. This is done for testing purpose and browsing a few site that only works with Internet Explorer. Since I only...
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Software Vs Hardware RAID
A redundant array of inexpensive disks (RAID) allows high levels of storage reliability. RAID is not a backup solution. It is used to improve disk I/O (performance) and reliability of your server or...
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Vmware Linux Guest Add a New Hard Disk Without Rebooting Guest
As a system admin, I need to use additional hard drives for to provide more storage space or to separate system data from user data. This procedure, adding physical block devices to virtualized...
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5 Tips To Speed Up Linux Software Raid Rebuilding And Re-syncing
It is no secret that I am a pretty big fan of excellent Linux Software RAID. Creating, assembling and rebuilding small array is fine. But, things started to get nasty when you try to rebuild or...
View ArticleHP Releases Tru64 UNIX Advanced File System ( AdvFS ) Source Code
AdvFS is a file system that was developed by Digital Equipment Corp and continues to be part of HP's Tru64 operating system. AdvFS has been released under GPL v2.
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