[linux-lvm] Meaning of strict allocation

[sachin]

Hi

when I  executed the lvdisplay command  i get the following output

--- Logical volume ---
LV Name                /dev/vg/lv1
VG Name                vg
LV Write Access        read/write
LV Status              available
LV #                   1
# open                 0
LV Size                4 GB
Current LE             1024
Allocated LE           1024
Stripes                4
Stripe size (KByte)    16
Allocation             next free
Read ahead sectors     1024
Block device           58:0

Can any one tell  me what that ALLOCATION next free means
and also what strict allocation means.

I also tried lvdisplay  with -v option

it gives me read and writes
What that exactly means 
      1. No of read and write operation
      2  No of blocks transferd 
      3. No of sectors read or written 

One more thing  this io statics is from which time 
     1. bootup time
     2. lv creation time

Thanks
Sachin.