Only two physical drives visible.

Melvict · 19. September 2015

Linux noob:

I have create a OpenMediaVault DomU on my xenserver.
On the host I have 3 x 1TB and a 230GB drives. The host and VM's use the 230GB drive.
The 3 X 1TB drives are mapped through as per http://techblog.conglomer.net/…disk-access-on-xenserver/

On XenCenter I have attached these three drives to the OMV vm but only two of them will show up when I scan for Physical Disks.

root@openmediavault:~# ls -l
total 936
-rw-r--r-- 1 root root 208410 Sep 18 2014 openmediavault-omvextrasorg_0.6.25_all.deb
-rw-r--r-- 1 root root 208410 Sep 18 2014 openmediavault-omvextrasorg_0.6.25_all.deb.1
-rw-r--r-- 1 root root 267608 Aug 20 08:02 openmediavault-omvextrasorg_latest_all.deb
-rw-r--r-- 1 root root 267608 Aug 20 08:02 openmediavault-omvextrasorg_latest_all.deb.1

root@openmediavault:~# blkid
/dev/xvda1: UUID="a6c75686-4343-40c3-92d2-3c2a36eeed30" TYPE="ext4"
/dev/xvda5: UUID="a3e7e6a9-fb51-49de-be6b-5010850cabd0" TYPE="swap"
/dev/xvdb1: LABEL="vol01" UUID="ca7f94b9-3ffc-4350-bb75-9b8149b05f2a" TYPE="xfs"
/dev/xvdc1: LABEL="vol02" UUID="3568fc84-20af-4369-912d-1de5a2aa7b4c" TYPE="xfs"

root@openmediavault:~# df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 16G 1.2G 14G 9% /
udev 10M 0 10M 0% /dev
tmpfs 100M 412K 100M 1% /run
/dev/disk/by-uuid/a6c75686-4343-40c3-92d2-3c2a36eeed30 16G 1.2G 14G 9% /
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 343M 0 343M 0% /run/shm
/dev/xvdb1 932G 33M 932G 1% /media/ca7f94b9-3ffc-4350-bb75-9b8149b05f2a
/dev/xvdc1 932G 33M 932G 1% /media/3568fc84-20af-4369-912d-1de5a2aa7b4c

Any help would be appreciated.

Thanks in advance.

tinh_x7 · 19. September 2015

Usually when you installed OMV on a virtual machine as a guest such as Virtualbox or Proxmox, you might need to pass through the hard drives to it; in order for it to detect the drives.

Zitat

In order to get Xenserver to recognize the SATA drive we’ll need to create some symbolic links in the hypervisor’s /dev/xapi/block directory by editing the /etc/udev/rules.d/50-udev.rules
file. (The udev daemon in the kernel properly abstracts USB and SATA
while placing the appropriate node into the /dev directory).

Using /dev/sdb as the drive we wish to attach, add the following lines to /etc/udev/rules.d/50-udev.rules which are modified from similar USB mass storage detection rules.

Code

ACTION=="add", KERNEL=="sdb", SYMLINK+="xapi/block/%k", RUN+="/bin/sh -c '/opt/xensource/libexec/local-device-change %k 2>&1 >/dev/null&'"
ACTION=="remove", KERNEL=="sdb", RUN+="/bin/sh -c '/opt/xensource/libexec/local-device-change %k 2>&1 >/dev/null&'"

Zitat

You can add additional lines for additional devices (such as sdc, sdd) if you wish.

Save and reboot Xenserver. Your attached SATA hard disk should now be
recognized as a removable storage device, which can now be attached to a
virtual machine via the XenCenter console. It’ll be using an emulated
SCSI controller instead of USB, which means full read/write throughput!
Don’t forget to attach/detach the drive via XenCenter to/from the VM of
your choice – while it’s physically “hot swapable”, you can’t just yank
the physical drive out of a running VM that’s using it.

Alles anzeigen

source: http://techblog.conglomer.net/…disk-access-on-xenserver/

Melvict · 19. September 2015

@tinh_x7
What you are describing is from the link that I have attached. That is done and is working 100%.

The issue is that OMV only see two of the drives instead of three.
In the attached jpeg you can see that all three has been attached to OMV and in the original attachment you'll find that only two is recognised by OMV.

subzero79 · 20. September 2015

Does fdisk displays the disk?

do they enumerate at kernel boot all three disks? Take a detailed look at dmesg

Melvict · 20. September 2015

No, they are not displayed by fdisk.
I created a new OMV VM and then get this when I wanted to attach the third drive.
Seems that might be a limit from within XenServer.

I tried attaching those three drives to an Ubuntu vm on the same xenserver and that worked.
Very confused at the moment.

Jetzt mitmachen!