Re: Hi! Strange issue with LSR -- bitmaps hadn't been used during 2 of 3 RAIDs resync

[Igor M Podlesny <for.poige+lsr@xxxxxxxxx>]

On 26 June 2012 16:55, Igor M Podlesny <for.poige+lsr@xxxxxxxxx> wrote:
> On 26 June 2012 14:18, NeilBrown <neilb@xxxxxxx> wrote:
>> On Wed, 20 Jun 2012 10:49:32 +0800 Igor M Podlesny <for.poige+lsr@xxxxxxxxx>
>> wrote:
> […]
>>>    Here it is: http://pastie.org/4118133
>>
>> This doesn't appear to show the "start to end" that I suggested, just 10% to
>> 30%, but it does suggest that the bitmap isn't speeding things up at all, at
>> least for that part of the array... That is assuming you are talking about
>
>   Well, I decided that's enough to be "pasted", but anyway, I can
> assure you — it took ~ 1 hour, as it was estimated, so yeah — no use
> of bitmap. For sure.
>
>> md124.  I note that md125 doesn't have a bitmap.  Is that what you are
>> referring to?
>
>   Yeah, md125 is legacy RAID which is not being in use for a long
> time, it's just hanging around till re-layout happens.
>>
>> The next thing to do would be to look at the bitmap immediately after reboot
>> to see how many bits are set.  Maybe lots are set for some reason.

   That would more than unlikely due to:
   — it's prepended with several sync-sleeps
   — there's no intensive I/O
   — kernel should have flush all buffers on suspend as well

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