Thank you for the replies, guys. That vgchange command makes all logical volumes within the Volume Group (vg01) unavailable, correct? There is a live/production filesystem within vg01, unfortunately.
Here are the command results:
$ sudo lsof /dev/mapper/vg01-lvol21
$ sudo lsof /dev/vg01/lvol21
$ cat /proc/mounts
rootfs / rootfs rw 0 0
/dev/root / ext3 rw,data=ordered 0 0
/dev /dev tmpfs rw 0 0
/proc /proc proc rw 0 0
/sys /sys sysfs rw 0 0
/proc/bus/usb /proc/bus/usb usbfs rw 0 0
devpts /dev/pts devpts rw 0 0
/dev/vg00/lvol5 /usr ext3 rw,data=ordered 0 0
/dev/vg00/lvol4 /opt ext3 rw,data=ordered 0 0
/dev/vg00/lvol9 /oarchive ext3 rw,data=ordered 0 0
/dev/vg00/lvol6 /usr/local ext3 rw,data=ordered 0 0
/dev/vg00/lvol3 /tmp ext3 rw,data=ordered 0 0
/dev/vg00/lvol8 /oracle ext3 rw,data=ordered 0 0
/dev/vg00/lvol7 /var ext3 rw,data=ordered 0 0
/dev/vg00/lvol2 /home ext3 rw,data=ordered 0 0
/dev/cciss/c0d0p1 /boot ext3 rw,data=ordered 0 0
tmpfs /dev/shm tmpfs rw 0 0
/dev/vg01/lvol20 /u01 ext3 rw,data=ordered 0 0
/dev/vg01/lvol22 /db_backups ext3 rw,data=ordered 0 0
/dev/vg00/lvol10 /tmp1_mnt ext3 rw,data=ordered 0 0
none /proc/sys/fs/binfmt_misc binfmt_misc rw 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw 0 0
/etc/auto.misc /misc autofs rw,fd=6,pgrp=4746,timeout=300,minproto=5,maxproto=5,indirect 0 0
-hosts /net autofs rw,fd=12,pgrp=4746,timeout=300,minproto=5,maxproto=5,indirect 0 0
nfsd /proc/fs/nfsd nfsd rw 0 0
aspt5db1:/oarchive_nfs /oarchive_nfs nfs rw,vers=3,rsize=32768,wsize=32768,hard,proto=tcp,timeo=600,retrans=2,sec=sys,addr=aspt5db1 0 0
$ mount
/dev/mapper/vg00-lvol1 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/mapper/vg00-lvol5 on /usr type ext3 (rw)
/dev/mapper/vg00-lvol4 on /opt type ext3 (rw)
/dev/mapper/vg00-lvol9 on /oarchive type ext3 (rw)
/dev/mapper/vg00-lvol6 on /usr/local type ext3 (rw)
/dev/mapper/vg00-lvol3 on /tmp type ext3 (rw)
/dev/mapper/vg00-lvol8 on /oracle type ext3 (rw)
/dev/mapper/vg00-lvol7 on /var type ext3 (rw)
/dev/mapper/vg00-lvol2 on /home type ext3 (rw)
/dev/cciss/c0d0p1 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
/dev/mapper/vg01-lvol20 on /u01 type ext3 (rw)
/dev/mapper/vg01-lvol22 on /db_backups type ext3 (rw)
/dev/mapper/vg00-lvol10 on /tmp1_mnt type ext3 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
nfsd on /proc/fs/nfsd type nfsd (rw)
aspt5db1:/oarchive_nfs on /oarchive_nfs type nfs (rw,rsize=32768,wsize=32768,hard,addr=209.82.230.121)
$ grep -i lvol21 /etc/mtab /proc/mounts
$
