[Lustre-devel] Fwd: Disk rebuild
Nikita Danilov
nikita.danilov at clusterstor.com
Tue Dec 1 07:00:39 PST 2009
Hello,
On 03 Feb 2009 Jody McIntyre wrote:
> It is possible to significantly reduce resync (but not recovery) times
> using bitmaps, but these have been shown to hurt performance
> significantly. Another approach, journal-guided resynchronization, was
> studied in a 2005 paper but has never been merged into the kernel. The
> paper shows improvements in resync times from 254 seconds to 0.21
> seconds (for a 1 GB test array) with under 5% performance impact. This
> is an option if we're willing to develop and maintain the patches to do
> it.
what is the status of this? Is ext3 guided resync code (RHEL 5 version
was posted on lkml in October) used by Lustre?
>
> Cheers,
> Jody
Thank you,
Nikita.
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