[linux-lvm] lvextend on iSCSI lun

[Igor Feoktistov]

Hi,

Has anybody succeeded in fs resizing on iscsi lun?
I've created vg on iscsi disk /dev/sdb and lv using
all available space.
When I resized the lun on iscsi target and did "echo 1
>
sys/devices/platform/host0/target0:0:0/0:0:0:1/rescan",
I could see the message from kernel showing correct
new size:
--
Jul  2 14:28:42 iscsi-rh4u1 kernel: SCSI device sdb:
73400320 512-byte hdwr sectors (37581 MB)
Jul  2 14:28:42 iscsi-rh4u1 kernel: SCSI device sdb:
drive cache: write through
--
However, it's not visible from lvm. 
fdisk and parted also show old disk geometry.
When I tried "blockdev --rereadpt /dev/sdb, I got next
error:
--
BLKRRPART: Device or resource busy
--
Is there any way to make a new space visible for lvm?
Also is there any plans to implement pvresize in
RH4/lvm2?
I understand that vgcfgbackup/restore with editing pe_count
can do the trick.
However, I don't think it's safe to extend volume if
pe_count is not calculated right.

The platform is x86 RHEL4U1, kernel 2.6.9-11.ELsmp,
linux-iscsi-4.0.2

PS: I really hoped on using ext2online. Any help how
to make it work on iscsi disks will be very
appreciated.