[linux-lvm] Query on PE size

[Kumar amit mehta]

Hi,

I see that a VG will set the default PE size to 4MiB, i.e.
4 * 1024 * 1024 = 4194304 
(Please correct me if I'm wrong)

<snip>
# pvcreate /dev/vdc1
# vgcreate testvg /dev/vdc1
# vgdisplay
# vgdisplay testvg|grep "PE Size"
   PE Size               4.00 MiB <----
<snip>

I see that :
vgcreate() 
 -->vgcreate_params_set_defaults()
   -->vp_def->extent_size = DEFAULT_EXTENT_SIZE * 2;

Where DEFAULT_EXTENT_SIZE is #defined to 4096
<snip from lib/config/defaults.h>
#define DEFAULT_EXTENT_SIZE 4096        /* In KB */
<snip from lib/config/defaults.h>

This means that the default extent size being set is 8192, but as mentioned 
earlier,the default extent size as reported by 'vgdisplay' is 4 MiB. So Can
someone please point me to the place where this conversion of 8192 into 4MiB
is taking place in the code ?

-Amit