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CONFIG_EXT3_DEFAULTS_TO_ORDERED: Default to 'data=ordered' in ext3 (legacy option)

General informations

The Linux kernel configuration item CONFIG_EXT3_DEFAULTS_TO_ORDERED has multiple definitions:

Default to 'data=ordered' in ext3 (legacy option) found in fs/ext3/Kconfig

The configuration item CONFIG_EXT3_DEFAULTS_TO_ORDERED:

Help text

If a filesystem does not explicitly specify a data ordering mode, and the journal capability allowed it, ext3 used to historically default to 'data=ordered'.

That was a rather unfortunate choice, because it leads to all kinds of latency problems, and the 'data=writeback' mode is more appropriate these days.

You should probably always answer 'n' here, and if you really want to use 'data=ordered' mode, set it in the filesystem itself with 'tune2fs -o journal_data_ordered'.

But if you really want to enable the legacy default, you can do so by answering 'y' to this question.

Default to 'data=ordered' in ext3 found in fs/ext3/Kconfig

The configuration item CONFIG_EXT3_DEFAULTS_TO_ORDERED:

Help text

The journal mode options for ext3 have different tradeoffs between when data is guaranteed to be on disk and performance. The use of "data=writeback" can cause unwritten data to appear in files after an system crash or power failure, which can be a security issue. However, "data=ordered" mode can also result in major performance problems, including seconds-long delays before an fsync() call returns. For details, see:

http://ext4.wiki.kernel.org/index.php/Ext3_data_mode_tradeoffs

If you have been historically happy with ext3's performance, data=ordered mode will be a safe choice and you should answer 'y' here. If you understand the reliability and data privacy issues of data=writeback and are willing to make that trade off, answer 'n'.

Hardware

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