Patrick Spinler wrote:
One other bit of news, for what it's worth, are these:
http://lkml.org/lkml/2008/2/15/126
~ and
http://lkml.org/lkml/2008/2/15/166
So, for device mapper (e.g. lvm) devices, a solution is in the works.
Well in the works for 2.6.25.
Now the real question is what is in the works for back-porting for
SLES-10 and RHEL-5 ?
Assuming that patches for dm to support barriers make it through there
is still the ominous comment from Andrew Morton regarding the use of
barriers and why they made the Linux default to not use barriers:
"Last time this came up lots of workloads slowed down by 30% so I
dropped the patches in horror. I just don't think we can quietly go and
slow everyone's machines down by this much..."
If up to 30% slowdown of a filesystem is true, then workarounds such as
moving the Journal onto a separate disk start to look attractive........
mark
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