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[Bug 579572] Re: Lucid: Gave up waiting for root device (mptsas) resolved by rootdelay

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From: Launchpad Bug Tracker <579572@xxxxxxxxxxxxxxxxxx>
Date: Sat, 15 Feb 2014 04:18:05 -0000
Reply-to: Bug 579572 <579572@xxxxxxxxxxxxxxxxxx>
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[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/579572

Title:
  Lucid: Gave up waiting for root device (mptsas) resolved by rootdelay

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  I found this bug after doing a fresh install of Ubuntu 10.04 LTS server (amd64) on a Dell PowerEdge R410, with hardware RAID (SCSI storage controller SAS1068E PCI-Express Fusion-MPT SAS (LSI Logic / Symbios Logic)). Before installing Ubuntu 10.04, this server was booting without a problem with CentOS 5.4 (Linux 2.6.18). When the installation is over and after the first reboot, I get this error message:
  Gave up waiting for root device.
  ...
  ALERT! /dev/disk/by-uuid/[mydiskUUID here] does not exit. Dropping to a shell!
  Busybox v1.13.3 (Ubuntu 1:1.13.3-1ubuntu11) built-in shell (ash)
  (initramfs)

  If I wait between 10 and 20 seconds, I see:
  35.538649] sd 4:1:0:0: [sda] 584843264 512-byte logical blocks: (299 GB/278 GiB)
  [ 35.539484] sd 4:1:0:0: [sda] Write Protect is off
  [ 35.539555] sd 4:1:0:0: [sda] Mode Sense: 03 00 00 08
  [ 35.540034] sd 4:1:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
  [ 35.541687] sda: sda1 sda2 sda3 sda4 < sda5 >
  [ 35.560048] sd 4:1:0:0: [sda] Attached SCSI disk
  [ 36.521418] Adding 2096472k swap on /dev/sda3. Priority:-1 extents:1 across:2096472k
  [ 36.761904] EXT3 FS on sda2, internal journal
  [ 37.181651] EXT3 FS on sda1, internal journal
  "

  Then, I type exit and the boot resumes normally. I could reproduce
  this bug after every reboot.

  WORKAROUND: I solved this issue by adding to /etc/default/grub :
  GRUB_CMDLINE_LINUX_DEFAULT="rootdelay=50"

  and running update-grub

  Unlike Bug #576302 , I can solve the problem with rootdelay=50 and I
  don't use mptspi kernel module.

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