1. Reboot gave display this message: “Kernel Panic – Not Syncing: VFS: Unable To Mount Root FS”
2. Was able to boot into a past kernel. This gave me hope that it was just going to be a problem relating to the latest kernel installation
3. I discovered that the latest kernel files were not all completely created. Particularly boot/initramfs-4.1.12-124.24.3.el6uek.x86_64.img
4. I used dracut to build the image file:
   dracut /boot/initramfs-4.1.12-124.24.3.el6uek.x86_64.img 4.1.12-124.24.3.el6uek.x86_64
5. I also ran yum-complete-transaction to force yum to finish installing the rest of the files that were interrupted
6. I rebooted again and got the same error.
7. We discovered that the /boot/grub/grub.conf file did not create correctly. Problem: title Oracle Linux Server Unbreakable Enterprise Kernel (4.1.12-124.24.3.el6uek.x86_64) root (hd0,0) kernel /vmlinuz-4.1.12-124.24.3.el6uek.x86_64 ro root=/dev/mapper/vg_servername-lv_root rd_NO_LUKS LANG=en_US.UTF-8 rd_LVM_LV=vg_servername/lv_root rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=vg_servername/lv_swap KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet numa=off transparent_hugepage=never '''initrd /initramfs-4.1.12-61.1.28.el6uek.x86_64.img''' It appears that during the Kernel configuration build since /boot/initramfs-4.1.12-124.24.3.el6uek.x86_64.img was missing, it pointed to an incoreect initramfs file. This file boots the hard drive. Corrected: title Oracle Linux Server Unbreakable Enterprise Kernel (4.1.12-124.24.3.el6uek.x86_64) root (hd0,0) kernel /vmlinuz-4.1.12-124.24.3.el6uek.x86_64 ro root=/dev/mapper/vg_servername-lv_root rd_NO_LUKS LANG=en_US.UTF-8 rd_LVM_LV=vg_servername/lv_root rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=vg_servername/lv_swap KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet numa=off transparent_hugepage=never initrd /initramfs-4.1.12-124.24.3.el6uek.x86_64.img

/usr/sbin/asmtool -C -l /dev/oracleasm -n DATA1 -s /dev/mapper/3624a9370cabaece1c2594c9500011af1

Verify the asm disk was created:
oracleasm listdisks

Get baseline:
dmsetup info -c -o name,blkdevname,devnos_used,blkdevs_used,UUID

rescan:
iscsiadm -m session –rescan

Check for additions:
dmsetup info -c -o name,blkdevname,devnos_used,blkdevs_used,UUID

/var/lib/iscsi

# tree /var/lib/iscsi
.
├── ifaces
├── isns
├── nodes
│   └── iqn.2010-06.com.purestorage:flasharray.67f4936d72ed7e6
│       ├── 10.1.206.14,3260,1
│       │   └── default
│       ├── 10.1.206.15,3260,1
│       │   └── default
│       ├── 10.1.206.16,3260,1
│       │   └── default
│       └── 10.1.206.17,3260,1
│           └── default
├── send_targets
│   └── 10.1.206.14,3260
│       ├── iqn.2010-06.com.purestorage:flasharray.67f4936d72ed7e6,10.1.206.14,3260,1,default -> /var/lib/iscsi/nodes/iqn.2010-06.com.purestorage:flasharray.67f4936d72ed7e6/10.1.206.14,3260,1
│       ├── iqn.2010-06.com.purestorage:flasharray.67f4936d72ed7e6,10.1.206.15,3260,1,default -> /var/lib/iscsi/nodes/iqn.2010-06.com.purestorage:flasharray.67f4936d72ed7e6/10.1.206.15,3260,1
│       ├── iqn.2010-06.com.purestorage:flasharray.67f4936d72ed7e6,10.1.206.16,3260,1,default -> /var/lib/iscsi/nodes/iqn.2010-06.com.purestorage:flasharray.67f4936d72ed7e6/10.1.206.16,3260,1
│       ├── iqn.2010-06.com.purestorage:flasharray.67f4936d72ed7e6,10.1.206.17,3260,1,default -> /var/lib/iscsi/nodes/iqn.2010-06.com.purestorage:flasharray.67f4936d72ed7e6/10.1.206.17,3260,1
│       └── st_config
├── slp
└── static

cat /var/log/messages | grep “I/O error”

multipath -ll

dmsetup info -c -o name,blkdevname,devnos_used,blkdevs_used,UUID

lsscsi

ls -l /dev/disk/by-path/

iscsiadm -m session