Ordered data mode vs. writeback mode

[Gary Hawco]

Noticed that the newest set of patches in ext4-patch-queue has ordered data
mode as the default mode again. Tune2fs is now able to switch modes again.

What is the preferred mode for a home desktop system with ext4? Is
writeback still the fastest, but ordered data has more data integrity? And
does delalloc only work when writeback is enabled? And does the commit=XX
seconds still only work with writeback mode, ala ext3, or is it a valid
option with ordered data mode?

Trying to get an idea of the plethora of new options available with ext4.

Keep up the good work!

Gary



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[Andreas Dilger]

Post by Gary Hawco
What is the preferred mode for a home desktop system with ext4? Is
writeback still the fastest, but ordered data has more data integrity? And
does delalloc only work when writeback is enabled? And does the commit=XX
seconds still only work with writeback mode, ala ext3, or is it a valid
option with ordered data mode?

Using ordered mode is the default and preferred mode.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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[Mingming]

Post by Gary Hawco
Noticed that the newest set of patches in ext4-patch-queue has ordered data
mode as the default mode again. Tune2fs is now able to switch modes again.
What is the preferred mode for a home desktop system with ext4? Is
writeback still the fastest, but ordered data has more data integrity? And
does delalloc only work when writeback is enabled?

The update patch queue has patch to support delalloc on new ordered
mode. There seems an issue, Aneesh is debugging it now.

Post by Gary Hawco
And does the commit=XX
seconds still only work with writeback mode, ala ext3, or is it a valid
option with ordered data mode?

Should work for both mode.


Mingming

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