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Now that your hard drive is tuned for better performance, let s look at how you can tune the file system that acts as the interface to your disks Because Linux uses the ext2 file system, I will discuss tuning issues for that file system in the next section
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For years the ext2 file system has been the de facto file system for Linux It is not the greatest file system in the world, but it works reasonably well One of the ways you can improve the ext2 file system s performance is by changing the default block
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Part VI Tuning for Performance and Scalability
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size from 1024 to a multiple of 1024 (usually less than 4096) for servers with mostly large files Let s look at how you can change the block size
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Changing the block size of the ext2 file system
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To find out what kind of files (in terms of size) you have on a particular ext2 partition do the following: 1 su to root and change to the top directory of the ext2 partition 2 Run the following command, which is really a small script that uses the find and awk utilities This command-line script displays all the files and their sizes, and finally provides a total and average size of the entire partition
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find -type f -exec ls -l {} \; | \ awk BEGIN {tsize=0;fcnt=1;} \ { printf( %03d File: %-060s size: %d bytes\n ,fcnt++, $9, $5); \ tsize += $5; } \ END { printf( Total size = %d\nAverage file size = %02f\n , \ tsize, tsize/fcnt); }
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3 After you know the average size of the file system you can determine whether you should change the block size Say you find out your average file size is 8192, which is 2 4096 You can change the block size to be 4096 4 Unfortunately, you cannot alter the block size of an existing ext2 filesystem without rebuilding it So, you have to backup all your files from the filesystem and then rebuild it using the /sbin/mke2fs /dev/partition -b 4096 command For example, if you have backed up the /dev/hda7 partition and want to change the block size to 4096, use the /sbin/mke2fs /dev/hda7 -b 4096 command
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Changing the block size to a higher number than the default (1024) may yield significant performance in raw read speed as a result of a reduction in the number of seeks, as well as a potentially faster fsck session during boot, less file fragmentation, and the like However, increasing the block size blindly (that is, without knowing the average file size) can result in wasted space If the average file size is 2010 bytes on a system with 4096-byte blocks, each file will waste on average 2086 bytes (4096 2010)! So know your file size before messing with the block size
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To tune the ext2 file system, you need to install the e2fsprogs utility package as follows: 1 Download the e2fsprogs-versionsrcrpm (replace version with the latest version number) source distribution from wwwrpmfindnet I downloaded the e2fsprogs-119-0srcrpm package You can also get the source from the e2fsprogs project site at http://e2fsprogssourceforgenet su to root
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23 Creating a High-Availability Network
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2 Run the rpm -ivh e2fsprogs-versionsrcrpm command to extract the source into a /usr/src/redhat/SOURCES/ directory The source RPM drops a e2fsprogs-versiontargz file, which needs to be extracted with the tar xvzf e2fsprogs-versiontargz command This creates a subdirectory called e2fsprogs-version 3 Change to the new subdirectory e2fsprogs-version 4 Run mkdir build to create a new subdirectory and then change to that subdirectory 5 Run /configure script to configure the source tree Then run the make utility to create the binaries Then run make check to ensure that everything is built correctly Finally, run the make install command to install the binaries After you have installed the e2fsprogs utilities you can start using them as discussed in the following section
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