On Tue, 15 Feb 2011 15:47:37 -0500 Joe Landman <joe.landman@xxxxxxxxx> wrote:
> On 02/15/2011 03:37 PM, NeilBrown wrote:
> > On Tue, 15 Feb 2011 10:16:15 -0500 Joe Landman<joe.landman@xxxxxxxxx> wrote:
> >
> >> As a tie in to the Linux RAID list, we use md raid for our OS drives
> >> (SSD pairs), and other utility functions within the unit, as well as
> >> striping over our hardware accelerated RAIDs. We would like to use
> >> non-power of two chunk sizes, but haven't delved into the code as much
> >> as we'd like to see if we can make this work.
> >>
> >
> > md/raid0 (striping) currently supports non-power-of-two chunk sizes, though
> > it is a relatively recent addition.
> > (raid4/5/6 doesn't).
>
> Cool! We need to start playing with this ...
>
> Which kernels have the support?
It was enabled by commit fbb704efb784e2c8418e34dc3013af76bdd58101
so
$ git name-rev fbb704efb784e2c8418e34dc3013af76bdd58101
fbb704efb784e2c8418e34dc3013af76bdd58101 tags/v2.6.31-rc1~143^2~18
2.6.31 has this support.
However I note that mdadm still checks that the chunk size is a power of two:
if (chunk < 8 || ((chunk-1)&chunk)) {
I should fix that...
NeilBrown
>
> --
> Joe
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