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[Kalpana S Shetty <kalshett@xxxxxxxxxx>]

Today's build (mar 17) I installed on a NFS shared location and after
the installation while bringing up the VM I see message "sda2: WRITE
SAME failed. Manually zeroing." console and even dmesg has this message
logged.

Attached the dmesg.?field.comment=Today's build (mar 17) I installed on
a NFS shared location and after the installation while bringing up the
VM I see message "sda2: WRITE SAME failed. Manually zeroing." console
and even dmesg has this message logged.

Attached the dmesg.?field.comment=Today's build (mar 17) I installed on
a NFS shared location and after the installation while bringing up the
VM I see message "sda2: WRITE SAME failed. Manually zeroing." console
and even dmesg has this message logged.

Attached the dmesg.

** Attachment added: "dmesg_write_same.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1266737/+attachment/4028748/+files/dmesg_write_same.log

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https://bugs.launchpad.net/bugs/1266737

Title:
  error sda: WRITE SAME failed when installing package

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Description:
  ==========
  Was installing perl packages using apt-get install command. I saw WRITE SAME failed displayed during the process.

  Command used : apt-get install perl* 
  on my Ubuntu guest to install all perl packages.

  I saw the message as below
  .
  .
  .
  .
  Setting up perlindex (1.606-1) ...
  Generating index (this may take a while)...sda: WRITE SAME failed. Manually zeroing.
   done.

  it took few seconds to complete  and later on the process continued.

  
  Environment:
  ============

  Host: Power8
  Guest : ubuntu hosted on Power8

  used below qemu command :

  [root@localhost ubuntu_alpha1]# cat kvmg.p8.h
  KERNEL=trusty-server-cloudimg-ppc64el-vmlinuz-generic
  #FSIMAGE=trusty-server-cloudimg-ppc64el.img
  FSIMAGE=trusty-server-cloudimg-ppc64el.img.qcow2
  MEM=8G
  qemu-system-ppc64 \
          -enable-kvm -M pseries -cpu POWER8 -smp cores=4,threads=1 -m $MEM \
          -net nic -net user \
          -device spapr-vscsi -drive file=$FSIMAGE \
          -kernel $KERNEL \
          -append "earlyprintk root=/dev/sda console=hvc0 --no-sessions" \
          -nographic

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