Infusion Technology Solutions Blog
Technology related solutions, tips, tricks, and other interesting topics
Sometimes after inserting a new SSD ExpressCard device into your Vista computer for the first time you may see the following message under the device’s “ReadyBoost” tab: “Device interface is not supported”. Do the following to enable ReadyBoost for the device (assuming the device is ReadyBoost compatible):
- Start up the “Disk Management” manager under: Right-click over Computer in the Start menu->Manage->Storage->Disk Management
- Find the SSD device and right-click over it to bring up its properties
- Select the Policies tab
- Choose the option “Optimize for performance”
- Drive will remount and ReadyBoost should now be enabled for the device
Note: You can change the policy back to the default of “Optimize for quick removal” and the ReadyBoost option will still be enabled for the device. So the fact that you have to initially change the policy for the device just to enable ReadyBoost is probably a bug. This behavior was observed on an HP Pavilion DV6871US notebook computer with an 8GB Lexar ExpressCard SSD.
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- Tags: disk management, dv6871us, hp, lexar, readyboost, ssd, vista
If you notice Sendmail hanging up for many minutes while starting up at boot or while being used such as sending an email from a PHP script, it is probably a DNS lookup problem. Ensure your /etc/hosts file has the appropriate entries for your server that sendmail is running on:
127.0.0.1 localhost localhost.localdomain 192.168.1.80 www.foo.com www 192.168.1.80 www.foo.com.
Replace “www.foo.com” and “www” with your server’s fully qualified domain name and host name respectively. Replace “192.168.1.80″ with the IP address of your server. The last entry with the “.” at the end is critical so don’t forget it.
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- Tags: boot, centos, dns lookup, hang, linux, php script, redhat, rhel, sendmail, unix
Mysqldump Error 29
In: General IT Info
16 Feb 2009If you try to backup a MySQL database with a lot of tables using mysqldump, you may get an error similar to the following:
mysqldump: Got error: 29: File './test/test.MYD' not found (Errcode: 24) when using LOCK TABLES
To fix the problem you can add the –skip-lock-tables option to your mysqldump command line like so:
mysqldump --skip-lock-tables -u root -p db_foo > db_foo_backup_13FEB09.sql
Or you can permanently fix the problem by increasing the number of open files allowed by your MySQL service by specifying a sufficiently large value for the open_files_limit setting in your MySQL server configuration file. The open_files_limit needs to be placed under the [mysqld] section of the MySQL server configuration file. On CentOS 5 the default location of the MySQL service configuration file is /etc/my.cnf. Try specifying a value of 8192 like so:
[mysqld] open_files_limit = 8192
After you make the change to the MySQL server configuration file you’ll need to restart the MySQL service to put the changes into effect. On CentOS 5 you can restart the MySQL service with the following command:
service mysqld restart
How to Mirror A Directory Locally Using Rsync
12 Feb 2009Most of the instructions for mirroring a directory with Rsync involve mirroring the data to a different server. You can also use Rsync to sync or mirror a directory on the same computer as the source directory.
Here is an example command on how to mirror two directories locally. In this example, /home/apache/public_html is the source directory and /home/apache/public_html_bak is the destination directory. Forward slashes at the end of the directory names in the rsync command are important so don’t forget them. The sync is one-way in that the destination will mirror the source:
rsync -avr --delete --links /home/apache/public_html/ /home/apache/public_html_bak/
If you need to preserve ACLs and Extended attributes then you need to add the -A and -X switches:
rsync -avrAX --delete --links /home/apache/public_html/ /home/apache/public_html_bak/
If you want to just do a dry run to see what will happen when you run Rsync, then add the -n switch:
rsync -avrAXn --delete --links /home/apache/public_html/ /home/apache/public_html_bak/
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- Tags: backup, linux, mirror, rsync, source directory, sync
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This blog is about technology related topics. It will primarily contain problems and solutions to IT problems that I encounter on a day-to-day basis. In addition interesting things I come across either on or off the internet will be posted here as well. I will also include step-by-step tutorials to common tasks people may need to do with their computers.
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