[linux-lvm] Allocation Policy for Cloud Computing needed
Sebastian Riemer
sebastian.riemer at profitbricks.com
Tue Feb 21 09:48:51 UTC 2012
On 20/02/12 23:41, Ray Morris wrote:
> Since you're using RAID anyway, consider testing RAID 10, which will
> distribute IO across spindles.
I've already tested RAID-10 with MD as well as letting LVM do the
striping. This is total equal: There are too many IO processes on all
spindles for good performance. All r/w-heads in RAID-10 have to be
repositioned over and over again.
Even in random IO this only reads from a single spindle per RAID-1 array.
Without striping MD RAID-1 has a good read balancing algorithm. With
that I can read from both spindles in the RAID-1 array simultaneously.
> For scripting, see Linux::LVM on CPAN. It gives you that information
> as a nice data structure. I welcome feature requests and patches.
> (Linux::LVM::Do coming soon for modifying rather than just querying
> LVM objects.)
Thanks, I'll look at that.
Cheers,
Sebastian
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