new barriers - 2
Subsystems (2)
Quoted 6 lines
Here I announce 2nd version my new barrier support patches:
http://people.redhat.com/mpatocka/patches/kernel/barriers/They are against 2.6.29-rc3.
The most important enhancement is that with these patches, device mapper is able to send barrier requests to lower devices.
I guess it still won't work for those using LVM on md (Linux software RAID) because md lacks barrier support? Do you know if someone is working on it?
Signature · 2 lines
Tomasz Chmielewski http://wpkg.org
Quoted 10 lines · Tomasz Chmielewski
Quoted 7 lines
Here I announce 2nd version my new barrier support patches:
http://people.redhat.com/mpatocka/patches/kernel/barriers/They are against 2.6.29-rc3.
The most important enhancement is that with these patches, device mapper is able to send barrier requests to lower devices.
I guess it still won't work for those using LVM on md (Linux software RAID) because md lacks barrier support? Do you know if someone is working on it?
md raid1 has supported barriers since 2.6.17
But I'm not aware of any md work being done to support barriers in other raid levels. Judging by Neil Brown's thoughts on the matter (from 2006) it would seem unlikely he is putting effort to it, please see the following thread:
http://marc.info/?l=linux-raid&m=115321319003578&w=2
http://marc.info/?l=linux-raid&m=115335249503450&w=2
cc'ing linux-raid to see if others have more insight.
Quoted 16 lines · Mike Snitzer
Quoted 11 lines · Tomasz Chmielewski
Quoted 8 lines
Here I announce 2nd version my new barrier support patches:
http://people.redhat.com/mpatocka/patches/kernel/barriers/They are against 2.6.29-rc3.
The most important enhancement is that with these patches, device mapper is able to send barrier requests to lower devices.
I guess it still won't work for those using LVM on md (Linux software RAID) because md lacks barrier support? Do you know if someone is working on it?
md raid1 has supported barriers since 2.6.17
Quoted 9 lines
But I'm not aware of any md work being done to support barriers in other raid levels. Judging by Neil Brown's thoughts on the matter (from 2006) it would seem unlikely he is putting effort to it, please see the following thread:
http://marc.info/?l=linux-raid&m=115321319003578&w=2
http://marc.info/?l=linux-raid&m=115335249503450&w=2cc'ing linux-raid to see if others have more insight
Neil, Hannes,
Is Mike's assumption above still true - no plans/thoughts about doing barrier support for RAID5/6 and so on?
At least some things (the null barrier op) are in place now since your summary of a couple years back, does this make it easier?
Thanks!
Ric