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March 2, 2022 – 2:00 pm

Books have been written on the subject of awk and sed. Here’s a small sample of commands I put together over the years that are useful for everyday system administration tasks. Most of these tasks …

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Articles tagged with: filesystem

How to Really Kill Computer Viruses

February 21, 2010 – 6:34 am

How do you know if your computer has a virus? Is it connected to the Internet? Then it has a virus. Many computer viruses and other malicious applications are very resilient and will actively resist any attempts to deactivate and remove them. Some viruses can even delete your antivirus application or prevent it from working properly. Many viruses cannot be effectively removed once they are loaded in memory and active.

Copying Data: Are We There Yet?

December 27, 2009 – 7:12 pm

I am sure this will sound familiar: you are copying a large amount of data – either locally or over the network – and you are wondering how long it will take and if there is a way to make things go faster.You may be surprised, but it does matter what type of files you are copying: 1Gb-worth of many small files will take considerably longer to copy than two 500Mb files. The hardware you are using is an important consideration, but it’s not the only factor limiting data transfer speed.

Filesystem Monitoring

April 21, 2008 – 11:43 am

Filesystem monitoring and notification tool for users.

Dealing with ReiserFS bad blocks

March 24, 2008 – 6:42 pm
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The following is a procedure for recovering a ReiserFS filesystem with bad blocks. If this is a system FS and cannot be unmounted, the box needs to be booted from the latest version of Knoppix …

ReiserFS Filesystem Recovery

March 21, 2008 – 3:55 pm
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The this is a description of a method for recovering ReiserFS filesystems from failed disks with bad blocks, when other recovery methods (reiserfsck) will not work. For this example, the failed server is called node1 …

Veritas HSM Maintenance

February 12, 2008 – 11:22 am
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When resizing a VXFS filesystem on a server that has HSM running, it is necessary to place HSM in maintenance mode for that particular filesystem. Failing to do so may cause the VFS resize operation …

Linux performance tuning

August 22, 2007 – 2:40 pm
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Linux Performance Tuning
April | May 2007 | by Jaqui Lynch
Note: This is the second article in a two-part series. The first installment was published in the February/March issue.
In last issue’s article I introduced basic Linux* …

Mountpoint permission problem in Solaris

May 4, 2006 – 6:45 pm
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The following condition was originally discovered in OpenSolaris 11 (Bug ID: 4697677). This problem occurs when you do mkdir -m 700 on a mountpoint before mounting it. This superceeds whatever permissions you might give to …

Creating large AIX JFS filesystems

April 21, 2006 – 12:01 pm
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A quick note on creating large JFS filesystems on AIX: if the filesystem is 64Gb or might be expanded to over 64Gb any time in the future, make sure the NBPI (Number of Bytes Per …

Solaris One-Liners

March 21, 2006 – 12:41 pm
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Useful Solaris commands for system administrators

Command-line backup methods

November 22, 2005 – 6:01 pm
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The following is a brief overview of standard Unix comman-line utilities used for data backup on Solaris systems. Most of the information below is also applicable to other unixoid systems.

Using rsync to copy files

November 21, 2005 – 4:00 pm
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In the following example we need to make sure that /export/home on server host2 looks exactly like /export/home on host1. Thus, our SOURCE is host1:/export/home and our TARGET is host2:/export/home
There are two ways of using …

Fsck operations

November 19, 2005 – 10:36 pm
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The following is a collection of examples using fsck command. It is important to unmount VXFS before running fsck on Veritas filesystem.