Frequently Asked Questions
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cd misc/ <br> | cd misc/ <br> | ||
mke2fs -E test_fs /dev/sdb1<br> | mke2fs -E test_fs /dev/sdb1<br> | ||
− | cd debugfs/ | + | cd debugfs/<br> |
− | ./debugfs -w /dev/sdb1 | + | ./debugfs -w /dev/sdb1<br> |
− | debugfs 1.40.5 (27-Jan-2008) | + | debugfs 1.40.5 (27-Jan-2008)<br> |
− | debugfs: set_super_value s_flags 4 | + | debugfs: set_super_value s_flags 4<br> |
− | debugfs: quit | + | debugfs: quit<br> |
− | blkid /dev/sdb1 | + | blkid /dev/sdb1<br> |
− | /dev/sdb1: UUID="3aa983ef-0dcd-474d-a9d3-2660ff6ef3e7" TYPE="ext4dev" | + | /dev/sdb1: UUID="3aa983ef-0dcd-474d-a9d3-2660ff6ef3e7" TYPE="ext4dev"<br> |
− | mkdir /mnt/test | + | mkdir /mnt/test<br> |
− | tune2fs -j /dev/sdb1 | + | tune2fs -j /dev/sdb1<br> |
− | mount -t ext4dev /dev/sdb1 /mnt/test | + | mount -t ext4dev /dev/sdb1 /mnt/test<br> |
− | df | + | df<br> |
=== Why do I get "EXT4-fs: sdb1: not marked OK to use with test code." in my dmesg? === | === Why do I get "EXT4-fs: sdb1: not marked OK to use with test code." in my dmesg? === | ||
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== Understanding how it works == | == Understanding how it works == | ||
− | === | + | === What are the new features in Ext4 (vs Ext2/3)? === |
− | + | === How do I test the features in Ext4? === | |
− | + | === What external tools are available for testing Ext4 FS? === | |
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− | + | === How do I benchmark the performance of Ext4 as against other FS? What are the tools available? === | |
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Revision as of 13:35, 28 March 2008
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Getting Started
Where do I get the latest version of e2fsprogs?
The latest version of e2fsprogs can be found at Soureforge or at kernel.org.
How do I build e2fsprogs?
The INSTALL file in the top of the source tree gives more detailed information, but e2fsprogs uses a standard configure script, so the standard "./configure; make" will build the e2fsprogs binaries. Note that if you wish to build the ELF shared libraries, you need to add the "--enable-elf-shlibs" option to the configure invocation.
How do I mount a fresh new storage device as ext4?
For example, if the new device has been detected as /dev/sdb1 (check "dmesg" output):
Using the newly installed e2fsprogs:
cd misc/
mke2fs -E test_fs /dev/sdb1
cd debugfs/
./debugfs -w /dev/sdb1
debugfs 1.40.5 (27-Jan-2008)
debugfs: set_super_value s_flags 4
debugfs: quit
blkid /dev/sdb1
/dev/sdb1: UUID="3aa983ef-0dcd-474d-a9d3-2660ff6ef3e7" TYPE="ext4dev"
mkdir /mnt/test
tune2fs -j /dev/sdb1
mount -t ext4dev /dev/sdb1 /mnt/test
df
Why do I get "EXT4-fs: sdb1: not marked OK to use with test code." in my dmesg?
This error arises from not executing the "mke2fs -E test_fs /dev/sdb1", which will label
How do I turned off the mballoc feature?
By default "mount" will enable mballoc feature when mounting. To turn it off:
mount -t ext4dev -o data=writeback,delalloc,extents,nomballoc /dev/sdb1 /mnt/test
How do I turned off the extent feature?
By default "mount" will enable extent feature when mounting. To turn it off:
mount -t ext4dev -o data=writeback,delalloc,noextents,mballoc /dev/sdb1 /mnt/test
CAUTION: Once extent feature has been turned on, it is not possible to mount it as ext3 anymore.
Why do I get "EXT4-fs: Unrecognized mount option "delalloc" or missing value"?
Please download the ext4 version from the git patchset, instead of using the kernel source.
What is mballoc feature? After I mounted a partition as mballoc, can I remount it as nomballoc?
Yes, it is possible, just dismount the partition first, and execute "mount" with the nomballoc feature.