Re: [PATCH 1/2] md bitmap bug fixes

[Michael Tokarev <mjt@tls.msk.ru>]

Peter T. Breuer wrote:
> Michael Tokarev <mjt@tls.msk.ru> wrote:
[]
>>o For md, all drives are equal, that is, for example, raid1
>>  code will balance reads among all the available drives a-la
> 
> Not necessarily so. At least part of the FR1 patch is dedicated to
> timing the latencies of the disks, and choosing the fastest disk to
> read from.
[]
>>o We all know how md "loves" to kick off "faulty" array components
>>  after first I/O error, don't we?  DRBD allows "temporary" failures
> 
> Again, the FR1 patch contains the "Robust Read" subpatch, which stops
> this happening. It's not a patch that intersects with the bitmap
> functionality at all, by the way.
[]
> 
> Well, so will FR1 (at least when run over ENBD, because FR1 contains
> a machanism that allows the disks to tell it when they have come back
> into their full gleam of health again).

Ok, you intrigued me enouth already.. what's the FR1 patch?  I want
to give it a try... ;)  Especially I'm interested in the "Robust Read"
thing...

/mjt