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- VMware and SCSI: It is valid to believe the answer is invalid. May 21, 2019 by jhop In the world of storage you often get to work with many different operating systems, applications, hardware, protocols and so much more.
Learn how to map Linux disk to VMware disk for virtual machines hosted on VMware. This ensures you are treating the correct disk on the virtualization layer.
To do a re-scan of your SCSI bus while the Virtual Machine is running, to force it to re-read all its attached hard disks, you can issue the following command. First, find your hostbus ID. # ls /sys/class/scsihost host0. In this case, host0 is the hostbus. Next, force a rescan.
It’s always a challenge to identify the correct disk physically when it’s being used in the virtualization layer. Since disk or hardware is attached to the Host physically and made visible to the guest server. Any activity related to physical attribute which is to be done on guest machine seeks perfect mapping of hardware from guest to host. In other posts, we already explained mapping iVM disks to host disks in HPUX (HPUX virtualization). In this post, we will be seeing how to map Linux disk to VMware disk (VMware virtualization).
Like HPUX, we do not have a direct command to see the mapping of disks. In HP, both hardware (server), OS software (HPUX), and virtualization technology (iVM) all three products are owned/developed by HP. This makes it possible to integrate tasks into a single command. Since VMware, Linux is not a single vendor configuration, I think it’s not yet possible to get things done with single-line command.
Vmlite Scsi Device
To map VMware disks to Linux VM, we need to check and relate the SCSI id of disks.
In vmware :
Check VM settings and identify disk SCSI id.
As highlighted in above screenshot, identify your SCSI id. Here its 0:0
In Linux VM:
Vmlite Scsi Connector
Now login to Linux VM and execute below command :
We are filtering disk messages from syslog at the boot, to get disk SCSI id identified by the kernel. This will show us disk names along with 4 numbers. Every disk has 4 numbers displayed in the output. SCSI, channel, id, and lun. We are interested here in channel and id numbers.
For example, disk
sda in the above output has numbers
0:0:0:0 whereas disk
0:0:1:0. Look at the second and third number i.e.
0:0:1:0. Sometimes you have to check first and third fields to match numbers.
Now match this SCSI id with the id you got from VMware console (VM settings panel).
0:0 is matching that means disk
sda in Linux is what we are looking at in VMware Hard Disk 1.
Sometimes RDM disks are assigned to guests from VMware in that case above method is not sufficient to identify disks. You have another approach.
Get sg number from Linux VM :
Vmlite Scsi Interface
sgX number is always less than one from VMware “Hard Disk X” number. So sgX+1=Hard Disk X. This means in Linux disk
sg starts with
sg0 but in VMware it starts with Hard Disk 1. In the above example,
sg1 will be Hard Disk 2 in VMware.
Match numbers accordingly and you will be able to map guest disk with vmware disk!
Vmlite Scsi & Raid Devices Drivers
If you have any other method to get this task done, please drop us in comments!