[Bug 599255] Re: dmraid fails to read promise RAID sector count larger than 32-bits

[Phillip Susi]

You should bear in mind that fakeraid puts your data at risk.  In the
event of a crash or power failure, some data can be written to one disk
and not the other.  When the system comes back up, a proper raid system
will copy everything from the primary to the secondary disk, or at least
the parts of the disk ( if you have a write intent bitmap ) that were
dirty at the time of the crash, and only allow reads from the primary
disk until that is complete.  Fake raid does neither of these, so which
disk services a read request is a toss up so the system might read the
old data on one disk or the new data on the other disk, and this can
flip flop back and forth on a sector by sector basis, causing all sorts
of filesystem corruption.

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https://bugs.launchpad.net/bugs/599255

Title:
  dmraid fails to read promise RAID sector count larger than 32-bits

Status in dmraid package in Ubuntu:
  Triaged
Status in Baltix:
  New
Status in dmraid package in Fedora:
  New

Bug description:
  I have two amd sb7*** motherbord. I tryed two case.

  I use raid0(1.5TB x 3=4.5TB) by bios(SB7*0).

  I partitioned two array. 2.0TB(A) and 2.5TB(B).

                     win7-64
                     winxp32    ubuntu10.4 /fedora13
  ------------------------------------------------------------------
  raid-A 2.0TB   ok              ok          all capacity OK
  raid-B 2.5TB   ok (all)       no*1      only 300GB(NG)
  ------------------------------------------------------------------
  *1=ubuntu knows only 300gb. fedora too.

  ubuntu x64/Fedora13 x64,by DMRAID

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