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ext4 (fourth extended filesystem) is a journalling file system for Linux, developed as the successor to ext3. Use this tag for question that are ext4 specific, generic file system related questions should use tag [filesystem]

6
votes
using, and the solution they came up with to support ext4 was to introduce the newer version as e4fsprogs (with s/2/4/ on all of the command names). To make matters worse, ext4 support on RHEL 5 is …
answered Aug 5 '11 by Steven Pritchard
3
votes
The cfq I/O scheduler tends to perform horribly in these sorts of tests. In addition to the ionice suggestion earlier, you might want to try switching to the deadline I/O scheduler (either by booting …
answered Jul 18 '11 by Steven Pritchard
4
votes
There are things (usually in the kernel, like the NFS threads, swap files, bind mounts, etc.) that can keep a filesystem busy that won't show up in fuser. If you try to fsck a filesystem that is moun …
answered Jul 31 '11 by Steven Pritchard