brain-dump/sysadmin/vmware/multipathd-sda-add-missing-path.md

Syslog: multipathd: sda: add missing path

After an OS upgrade, the following begins to spam /var/log/syslog:

multipathd: sda: add missing path
multipathd: sda: failed to get udev uid: Invalid argument
multipathd: sda: failed to get sysfs uid: Invalid argument
multipathd: sda: failed to get sgio uid: No such file or directory

Cause

• There is no link in /dev/disk/by-id for SCSI (sdx) devices
• The OS is running as a guest on VMWare ESXI
• Source: SUSE: no /dev/disk/by-id for scsi LUNs on VMWare ESX

Fix

By default VMWare doesn't provide information needed by udev to generate /dev/disk/by-id.

You can make it do so, by editing the VM's settings.

If you don't have vCenter, follow the steps from SUSE's knowledgebase.

My notes cover the vCenter resolution

1. Ensure you have a snapshot from your NAS or SAN; a vCenter/ESXI-only snapshot may not wipe this change if you do a restore (didn't have to test it!)
2. In vCenter, power down the VM
3. Right-click the VM > Edit Settings
4. Click the VM Options tab
5. Under > Advanced > Configuration Parameters > Edit Configuration
6. Click the Add Configuration Params button
   • Name: disk.EnableUUID
   • Value: TRUE
7. Click OK > Save
8. Power on the virtual machine > tail -f /var/log/syslog and wait a bit to see if it returns (it should not)