Making New Linux Disk Visible Without a Reboot

I was having trouble today getting Linux to see my new partition space that I added in vSphere without rebooting the host. The new disk space was made visible by re-scanning the SCSI bus (below) and then the new partition was made visible by using the partprobe command (below).

 

I asked VMWare to provision my disk to be larger and then asked Linux to refresh the kernel info:

 $ echo 1 > /sys/class/scsi_device/0\:0\:3\:0/device/rescan 
 $ dmesg
 sdd: Write Protect is off 
 sdd: Mode Sense: 61 00 00 00 
 sdd: cache data unavailable 
 sdd: assuming drive cache: write through 
 sdd: detected capacity change from 171798691840 to 343597383680

 

I added another partition and then tried to get LVM to use it:

$ fdisk /dev/sdd
 Command (m for help): n
 Command action
 e extended
 p primary partition (1-4)
 p
 Partition number (1-4): 3

But LVM couldn’t see it:

 $ pvcreate /dev/sdd3
 Device /dev/sdd3 not found (or ignored by filtering).
 $ pvcreate -vvvv /dev/sdd3
 #device/dev-cache.c:578 /dev/sdd3: stat failed: No such file or directory
 #metadata/metadata.c:3546 
 #device/dev-cache.c:578 /dev/sdd3: stat failed: No such file or directory

The solution was to use partprobe to inform the OS of partition table changes:

 $ partprobe /dev/sdd
 $ pvcreate /dev/sdd3
 dev_is_mpath: failed to get device for 8:51
 Writing physical volume data to disk "/dev/sdd3"
 Physical volume "/dev/sdd3" successfully created

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