Remove SCSI LUN with sg number of opens at 2?

[Bruen, Mark]

I'm trying to remove a SCSI lun using:
echo "scsi remove-single-device 1 0 1 100" > /proc/scsi/scsi
It will not remove as seen in cat /proc/scsi/scsi:
Host: scsi1 Channel: 00 Id: 01 Lun: 100
  Vendor: 3PARdata Model: VV               Rev: 0000
  Type:   Direct-Access                    ANSI SCSI revision: 03

cat /proc/scsi/sg/devices shows it has 2 opens:
host   chan  id      lun     type   opens  qdepth  busy   online
1      0     1       100     0      2      30      0      1

Any way to find out what has it opened so it can be closed and removed
without a reboot?

Thanks.
    -Mark