All volumes attached to an instance are not shown in a Linux guest OS

Products

• VMware Integrated OpenStack

Issue/Introduction

Symptoms:

After attaching some volumes to a Linux instance, all volumes are correctly displayed in the guest OS.

For example:

• On Horizon VIO, seven volumes are attached to the instance.
• Inside Linux guest OS, only two are correctly displayed:
  
  [root@Linuxtest]# lsblk
  NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
  sda 8:0 0 12G 0 disk
  ├─sda1 8:1 0 1M 0 part
  ├─sda2 8:2 0 200M 0 part /boot
  └─sda3 8:3 0 4.8G 0 part
  └─VolGroup00-LogVol00 253:0 0 4.6G 0 lvm /
  sdb 8:16 0 10G 0 disk
  sr0 11:0 1 548K 0 rom
  
• You see this preceding result after scanning the storage interconnects, using this command:
  
  echo "1" > /sys/bus/pci/rescan

Cause

Resolution

To resolve this issue, rescab the SCSI bus.

To re-scan the SCSI bus entirely, reboot the guest operating system.

If the guest OS cannot be rebooted, perform force SCSI rescan using this command:

root@Linuxtest ]# echo "- - -" > /sys/class/scsi_host/*/scan

Where, the hyphens ""- - -" represent controller channel lun.

Therefore, – – – indicates all controllers, all channels, and all luns.

After running the preceding command, all the volumes should correctly show up in the guest OS:

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

sda 8:0 0 12G 0 disk

├─sda1 8:1 0 1M 0 part

├─sda2 8:2 0 200M 0 part /boot

└─sda3 8:3 0 4.8G 0 part

└─VolGroup00-LogVol00 253:0 0 4.6G 0 lvm /

sdb 8:16 0 10G 0 disk

sdc 8:32 0 1G 0 disk

sdd 8:48 0 5G 0 disk

sde 8:64 0 1G 0 disk

sdf 8:80 0 10G 0 disk

sdg 8:96 0 10G 0 disk

sr0 11:0 1 604K 0 rom

[root@vio-poc-nfscommon-0<mailto:root@vio-poc-nfscommon-0> ~]# lsscsi

[0:0:0:0] disk ATA VMware Virtual I 0001 /dev/sda

[0:0:1:0] cd/dvd NECVMWar VMware IDE CDR01 1.00 /dev/sr0

[2:0:0:0] disk VMware Virtual disk 2.0 /dev/sdb

[2:0:1:0] disk VMware Virtual disk 2.0 /dev/sdc

[2:0:2:0] disk VMware Virtual disk 2.0 /dev/sdd

[2:0:3:0] disk VMware Virtual disk 2.0 /dev/sde

[2:0:4:0] disk VMware Virtual disk 2.0 /dev/sdf

[2:0:5:0] disk VMware Virtual disk 2.0 /dev/sdg

Additional Information

Windows guest OS should pick up all the attached volumes and all the change in the discs when running a rescan directly on Disk Management pane.

Alternative method for disk rescanning using the command line:

1. Start a command prompt and type diskpart.
2. At diskpart prompt, type rescan.