Hot-add qcow2 [virtio-scsi] devices doesn't work in SlLES-11-SP2guest

[chandrashekar shastri]

The hot-adding virtio-scsi devices doesn't get recognized the sles guest even after running the rescan-scsi-bus.sh or echo ' - - - ' > /sys/class/scsi_host/host#/scan commands. It requires a reboot to get recognized.

This issue is not observed in case of rhel64-64 guests, soon after adding if we run the echo ' - - - ' > /sys/class/scsi_host/host#/scan, the devices gets recognizes.

Sles Guest kernel : 3.0.13-0.27-default

qemu-version : 1.5.50

Host kernel : 3.10.0-rc5+

Steps to reproduce:

1. Install the sles guest
2. Run the script to add the devices

#!/usr/bin/bash
if [ x$1 != x ]; then
cmd=$1
c=1
while [ $c -le 2 ]
do
qemu-img create -f qcow2 /home/virtio-scsi$c.qcow2 1G
#sleep 1
i="`cat file | head -$c | tail -1`"
virsh attach-disk $cmd /home/images/virtio-scsi$c.qcow2 $i --persistent --cache writethrough --sourcetype file --driver qemu --subdriver qcow2
#virsh detach-disk $cmd $i
 ((c++))
done
else
echo "enter the vm name"
fi

3. Run the rescan-scsi-bus.sh or echo ' - - - ' > /sys/class/scsi_host/host#/scan commands, inside the guest.

######################################################
rescan-scsi-bus.sh
Host adapter 0 (ata_piix) found.
Host adapter 1 (ata_piix) found.
Host adapter 2 (sym53c8xx) found.
Host adapter 3 (sym53c8xx) found.
Host adapter 4 (sym53c8xx) found.
Host adapter 5 (sym53c8xx) found.
Host adapter 6 (sym53c8xx) found.
Host adapter 7 (sym53c8xx) found.
Host adapter 8 (sym53c8xx) found.
Host adapter 9 (sym53c8xx) found.
Host adapter 10 (sym53c8xx) found.
Host adapter 11 (sym53c8xx) found.
Host adapter 12 (sym53c8xx) found.
Host adapter 13 (sym53c8xx) found.
Host adapter 14 (sym53c8xx) found.
Host adapter 15 (sym53c8xx) found.
Host adapter 16 (sym53c8xx) found.
Host adapter 17 (sym53c8xx) found.
Host adapter 18 (sym53c8xx) found.
Host adapter 19 (sym53c8xx) found.
Host adapter 20 (sym53c8xx) found.
Host adapter 21 (sym53c8xx) found.
Host adapter 22 (sym53c8xx) found.
Host adapter 23 (sym53c8xx) found.
Host adapter 24 (sym53c8xx) found.
Host adapter 25 (sym53c8xx) found.
Host adapter 26 (sym53c8xx) found.
Scanning SCSI subsystem for new devices
Scanning host 0 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
 Scanning for device 0 0 0 0 ...
OLD: Host: scsi0 Channel: 00 Id: 00 Lun: 00
      Vendor: ATA Model: QEMU HARDDISK Rev: 1.5.
      Type: Direct-Access ANSI SCSI revision: 05
Scanning host 1 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
 Scanning for device 1 0 0 0 ...
OLD: Host: scsi1 Channel: 00 Id: 00 Lun: 00
      Vendor: QEMU Model: QEMU DVD-ROM Rev: 1.5.
      Type: CD-ROM ANSI SCSI revision: 05
Scanning host 2 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 3 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 4 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 5 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 6 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 7 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 8 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 9 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 10 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 11 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 12 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 13 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 14 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 15 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 16 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 17 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 18 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 19 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 20 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 21 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 22 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 23 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 24 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 25 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
Scanning host 26 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs
0 new device(s) found.
0 device(s) removed.
################################################

4. At this point the devices should recognize, but it won't

Note: " fdisk -l /dev/sd* | grep -v /dev/sda " only after rebooting the guest.

[John Kizer (johnandmegh)]

Hi - does this bug still affect a currently supported version of Ubuntu?

Thanks!

[Launchpad Janitor (janitor)]

[Expired for Ubuntu because there has been no activity for 60 days.]