[Bug 1831386] Re: "fake" RAID 0 or RAID10, dmraid -tay reports incorrect size

[Martina Nunvarova]

*** This bug is a duplicate of bug 599255 ***
    https://bugs.launchpad.net/bugs/599255

** This bug has been marked a duplicate of bug 599255
   dmraid fails to read promise RAID sector count larger than 32-bits

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Title:
  "fake" RAID 0 or RAID10, dmraid -tay reports incorrect size

Status in dmraid package in Ubuntu:
  New

Bug description:
  Follow-up on:

  https://askubuntu.com/questions/113561/how-to-modify-fix-incorrectly-
  detected-dmraid-fakeraid-raid-10-array

  I am not certain that dmraid is the cause of this error but it may be
  the best place to start looking for it.

  This issue was raised on askubuntu 7 years ago without a meaninful
  reaction - therefore i do not want to rely on escalation from there.

  -----------
  (live CD)

  Description:	Ubuntu 18.04.2 LTS
  Release:	18.04
  -----------
  dmraid:
    Installed: 1.0.0.rc16-8ubuntu1
    Candidate: 1.0.0.rc16-8ubuntu1
    Version table:
   *** 1.0.0.rc16-8ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status
  -----------
  expected to see my RAID 10 in the system
  -----------
  RAID10 was not detected automaticaly, instead, the 4 individual drives are displayed in GParted.
  Attempted to add the RAID manually (dmraid -ay), dmraid recognises there is a raid, but reports incorrect size and checksum error

  Reconfigured RAID to RAID0 and RAID1 to test, both RAID found
  automatically, RAID0 has incorrect size, checksum correct in both
  cases

  *************
  sdb,sdc : Seagate 2TB
  sdd,sde : Toshiba 2TB

  3907029168 sectors each HDD
  *************

  #dmraid -tay

  pdc_bagjfgcja: 0 3518828800 striped 2 128 /dev/sdb 0 /dev/sdc 0
  pdc_bffcfgdcc: 0 3906898048 mirror core 2 131072 nosync 2 /dev/sdd 0 /dev/sde 0 1 handle_errors

  *************

  #dmraid -s

  *** Active Set
  name   : pdc_bagjfgcja
  size   : 3518828800
  stride : 128
  type   : stripe
  status : ok
  subsets: 0
  devs   : 2
  spares : 0
  *** Active Set
  name   : pdc_bffcfgdcc
  size   : 3906898048
  stride : 128
  type   : mirror
  status : ok
  subsets: 0
  devs   : 2
  spares : 0

  --------------
  #dmraid -n /dev/sdb

  /dev/sdb (pdc):
  0x000 promise_id: "Promise Technology, Inc."
  0x018 unknown_0: 0x20000 131072
  0x01c magic_0: 0xe1e2e3e4
  0x020 unknown_1: 0xdddedfe0 3722371040
  0x024 magic_1: 0xd9dadbdc
  0x028 unknown_2: 0xd7d8 55256
  0x200 raid.flags: 0xfdfeffc0
  0x204 raid.unknown_0: 0x7 7
  0x205 raid.disk_number: 0
  0x206 raid.channel: 0
  0x207 raid.device: 0
  0x208 raid.magic_0: 0xcd0602
  0x20c raid.unknown_1: 0x0 0
  0x210 raid.start: 0x0 0
  0x214 raid.disk_secs: 3906898096
  0x218 raid.unknown_3: 0xffffffff 4294967295
  0x21c raid.unknown_4: 0x1 1
  0x21e raid.status: 0xf
  0x21f raid.type: 0x0
  0x220 raid.total_disks: 2
  0x221 raid.raid0_shift: 7
  0x222 raid.raid0_disks: 2
  0x223 raid.array_number: 0
  0x224 raid.total_secs: 3518828800
  0x228 raid.cylinders: 65534
  0x22a raid.heads: 254
  0x22b raid.sectors: 63
  0x22c raid.magic_1: 0x6600602
  0x230 raid.unknown_5: 0x0 0
  0x234 raid.disk[0].unknown_0: 0x7
  0x236 raid.disk[0].channel: 0
  0x237 raid.disk[0].device: 0
  0x238 raid.disk[0].magic_0: 0xcd0602
  0x23c raid.disk[0].disk_number: 0
  0x240 raid.disk[1].unknown_0: 0x207
  0x242 raid.disk[1].channel: 1
  0x243 raid.disk[1].device: 0
  0x244 raid.disk[1].magic_0: 0xce0602
  0x248 raid.disk[1].disk_number: 65536
  0x7fc checksum: 0x87c487f9 Ok

  --------------

  3518828800 is 2*3906898048 with the most significant of the 33 bits
  ignored.

  Hence the assumption that a 32 bit integer is used for the number of
  sectors somewhere.

  Thank you for looking into this.

  Regards,
  Martina.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: dmraid 1.0.0.rc16-8ubuntu1
  ProcVersionSignature: Ubuntu 4.18.0-15.16~18.04.1-generic 4.18.20
  Uname: Linux 4.18.0-15-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  CasperVersion: 1.394
  Date: Sun Jun  2 19:38:05 2019
  LiveMediaBuild: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: dmraid
  UpgradeStatus: No upgrade log present (probably fresh install)

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