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Re: [Qemu-block] megasas: Unexpected response from lun 1 while scanning,

From: Hannes Reinecke
Subject: Re: [Qemu-block] megasas: Unexpected response from lun 1 while scanning, scan aborted
Date: Wed, 27 Mar 2019 12:31:37 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1

On 3/26/19 5:47 PM, Dongli Zhang wrote:
I am reporting an error that the scsi lun cannot initialize successfully when I
am emulating megasas scsi controller with qemu.

I am not sure if this is issue in qemu or linux kernel.

When 'lun=1' is specified, there is "Unexpected response from lun 1 while
scanning, scan aborted".

Everything works well if 'lun=0' is specified.

Below is the qemu cmdline involved:

-device megasas,id=scsi0 \
-device scsi-hd,drive=drive0,bus=scsi0.0,lun=1 \
-drive file=/home/zhang/img/test.img,if=none,id=drive0,format=raw

Below is the syslog related to 'scsi|SCSI'

# dmesg | grep SCSI
[    0.392494] SCSI subsystem initialized
[    0.460666] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 
[    0.706788] sd 1:0:0:0: [sda] Attached SCSI disk
# dmesg | grep scsi
[    0.511643] scsi host0: Avago SAS based MegaRAID driver
[    0.523302] scsi 0:2:0:0: Unexpected response from lun 1 while scanning, 
scan aborted
[    0.540364] scsi host1: ata_piix
[    0.540780] scsi host2: ata_piix
[    0.702396] scsi 1:0:0:0: Direct-Access     ATA      QEMU HARDDISK    2.5+ 
PQ: 0 ANSI: 5

When 'lun=1' is changed to 'lun=0', there is no issue.

Thank you very much!

That's an artifact from the megasas emulation in quemu.
Megasas (internally) can't handle LUN numbers (the RAID part only knows about 'disks'), so I took the decision to not expose devices with LUN != 0.
Please use a different SCSI target number, not a non-zero LUN number.


Dr. Hannes Reinecke                Teamlead Storage & Networking
address@hidden                                 +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Mary Higgins, Sri Rasiah
HRB 21284 (AG Nürnberg)

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