December 2002
Intermediate to advanced
260 pages
9h 18m
English
Content preview from Managing RAID on LinuxBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Tuning ext2 Filesystems
As I mentioned in the previous section, tune2fs can configure variables associated with an already initialized ext2 filesystem. In addition, there are a number of other tactics that you can use to improve the performance of an ext2 partition: software-RAID-specific options for mke2fs, mount options, and filesystem attributes.
Reserved space
ext2 sets aside a fixed amount of space, by default, for the super-user. This reserved space is supposed to ensure that essential processes, usually running with a UID or GID of root, are able to continue writing data, even after the filesystem becomes full for normal users. In practice, nonprivileged users and processes are often able to unintentionally bypass this safeguard, so it’s not really a reliable security mechanism.
By default, 5 percent of the total disk space is reserved when an ext2 filesystem is created. Using the -m flag, users can adjust this percentage to meet their needs. An integer value between 1 and 100 must be used. In this example, 10 percent of the total disk space is reserved:
# mke2fs -m 10 /dev/md0It might also be useful to change the user who is allowed to write data to the reserved disk space. Since security is such a well-publicized issue these days, many programs no longer run as root. Therefore, you might find it useful to allow the user account under which your database runs, for instance, to have access to the reserved areas on certain partitions. Use the tune2fs command to modify the reserved ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.