Are there recommended SCSI timeout values for using raw devices on Linux VMs?
VMware Tools creates a udev rule to change the timeout for devices classified by Vendor "VMware" or attribute "Virtual Disk" from 30 seconds to 180 seconds. This rule does not apply to raw devices since they do not appear as virtual disks to the VM.
[root@server1 ~]# lsscsi
[2:0:0:0] disk VMware Virtual disk 1.0 /dev/sda
[2:0:1:0] disk VMware Virtual disk 1.0 /dev/sdb
[2:0:2:0] disk VMware Virtual disk 1.0 /dev/sdc
[2:0:3:0] disk DGC VRAID 0532 /dev/sdd
[2:0:4:0] disk VMware Virtual disk 1.0 /dev/sde
[2:0:5:0] disk VMware Virtual disk 1.0 /dev/sdf
[2:0:6:0] disk VMware Virtual disk 1.0 /dev/sdg
[3:0:0:0] disk DGC VRAID 0532 /dev/sdh
[3:0:1:0] disk DGC VRAID 0532 /dev/sdi
[3:0:2:0] disk DGC VRAID 0532 /dev/sdj
[root@server1 ~]# find /sys/class/scsi_device/*/device/timeout -exec grep -H . '{}' \;
/sys/class/scsi_device/2:0:0:0/device/timeout:180
/sys/class/scsi_device/2:0:1:0/device/timeout:180
/sys/class/scsi_device/2:0:2:0/device/timeout:180
/sys/class/scsi_device/2:0:3:0/device/timeout:30
/sys/class/scsi_device/2:0:4:0/device/timeout:180
/sys/class/scsi_device/2:0:5:0/device/timeout:180
/sys/class/scsi_device/2:0:6:0/device/timeout:180
/sys/class/scsi_device/3:0:0:0/device/timeout:30
/sys/class/scsi_device/3:0:1:0/device/timeout:30
/sys/class/scsi_device/3:0:2:0/device/timeout:30
Does VMware recommend changing these to 180 as well or leaving them to the default settings? Does it matter if the RDM is in virtual or physical mode? (RDM-V vs. RDM-P)