[gentoo-user] LVM and moving things around

[Dale]

Howdy,

I sort of started this on another thread but wanted to nail a few things
down first.  I'm wanting to encrypt some parts of my data on /home. 
This is what I got hard drive wise.


root@fireball / # pvs
  PV         VG     Fmt  Attr PSize    PFree
  /dev/sda7  OS     lvm2 a--  <124.46g 21.39g
  /dev/sdb1  Home2  lvm2 a--    <5.46t     0
  /dev/sdc1  Home2  lvm2 a--    <7.28t     0
  /dev/sdd1  Home2  lvm2 a--    <7.28t     0
  /dev/sde1  backup lvm2 a--   698.63g     0
root@fireball / #


I've done some checking on sizes of things I want to encrypt and am
weighing options.  I use LVM which should help make things easier.  I've
downloaded and printed some howtos regarding shrinking the file system
and LVM thingys.  It seems I need to shrink the file system while my
/home partition is unmounted.  Then move the data off whichever drive I
want to remove and then remove the drive itself.  After that I can
encrypt the just removed drive and start moving files over, using rsync
is my plan.  I think that is the basic steps.

My question now comes to this.  When I encrypt one of the drives, can I
then expand that drive with it being encrypted or is that not a option? 
I plan to encrypt two of the drives as one volume group and leave one
other volume group as normal.  I just want to be sure whether or not I
can expand a encrypted LVM drive the same as a normal LVM since both
uses LVM.  I use cryptsetup commands to accomplish the encryption if
that matters.  So as a example, I start with one 7TB drive encrypted,
move some data to it, then want to add either the 5TB or 7TB drive.  Can
I just expand it like a normal LVM or does it being encrypted change
things? 

Thoughts?  My remove steps look sensible?  Expanding encrypted LVM
possible?

Dale

:-)  :-)