SFW providers log the removal of the device after all paths lost as seen in the Event Log:
Information Servername 801 VxSvc_pnp Device \Device\Harddiskx is removed.
The Volume Manager provider will log related messages as harddisks are removed and the constituent disks from a diskgroup are lost:
Error Servername 10001 VxSvc_vxvm vxvm provider reported physical disk Missing Disk (Diskx) was removed or is temporarily unavailable.
When the devices return to the system VXIO driver will log:
Information Servername 34 vxio vxio: Harddiskx is re-online by PnP
After the multipathing software or array firmware upgrade, the operating system detects this and reinstalls its own driver. During this process, the devices will be briefly unavailable to the server.
The process to upgrade multipathing drivers and array firmware drivers involves a reboot for the updated drivers to take effect. It is recommended to add a second reboot to the procedure to enable the updated operating system drivers to be available for the devices on system startup.
Process:
1. Perform Multipathing or Array Firmware driver upgrade/update.
2. Reboot the server as required
3. When server comes back up, reboot a 2nd time
Following the 2nd reboot, this issue should be avoided.