Messages in this thread | | | Subject | Re: Out-of-order writing by disk drives | Date | Tue, 14 Apr 2009 18:33:50 +0200 (CEST) | From | "Anton Ertl" <> |
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Andi Kleen wrote: > > "Anton Ertl" <anton@mips.complang.tuwien.ac.at> writes: > > > > /dev/md2 /home ext3 defaults,barrier=1 1 2 > > Just make sure /dev/md2 is a RAID1, MD RAID0/5/10 don't support barriers.
Thank you. I added the following to the README:
|Note that, as of this writing (2009-04), not all Linux devices support |barriers, in particular md devices only support them in RAID 1 mode; |the kernel will reportedly warn about the lack of barriers if you try |to use ext3 with barriers on a device that does not support barriers |(look in, e.g., dmesg).
> See also my general treatise of multiple device barriers earlier today.
I guess you mean <878wm3903h.fsf@basil.nowhere.org> in the "dm-multipath and write request ordering" thread. Thank you for the pointer.
- anton
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