[Lustre-devel] Fwd: Disk rebuild

Nikita Danilov nikita.danilov at clusterstor.com
Tue Dec 1 07:00:39 PST 2009


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,

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