Re: [PATCH] Online RAID-5 resizing

On Wed, Sep 21, 2005 at 01:01:42AM +1000, Neil Brown wrote:

I doubt speed is a top priority.

I just found something interesting; if I raise speed_limit_min, I get much
better speed than I initially got. My 2->4 slow IDE disk setup:

md1 : active raid5 hdg1[4] hde1[5] hdc1[1] hda1[0]
      39078016 blocks level 5, 64k chunk, algorithm 2 [4/2] [UU__]
      [==========>..........]  resync = 52.4% (20499840/39078016) finish=50.0min speed=6187K/sec

This is more than good enough for me, at least. :-)

I noticed a problem during a big test resize now, BTW; for some reason,
pdflush goes into uninterruptable sleep, and kjournald and thus the
filesystem seems to follow. I'm not sure if this is a starvation issue or
not, but it sure is a bug -- I'll look into it and see if I find something
obvious.

/* Steinar */
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