[linux-lvm] LVM + SAN Behavior

[Kreig DuBose]

Hello-
 
I too am sharing the same issue regarding SAN file systems and Linux
LVM.  I have a device presented via FC on RHEL 3 update 3.  I'm using
the LVM provided by RedHat:

lvm-1.0.8-5

I started with a simple raid 5 configuration with 3 disks (approx
135GB).  Now I've added 1 more disk into the array (Done on a DS4300). 
 
When I created the file systems I did so as such:

pvcreate /dev/sdc
vgcreate <volgrp_name> /dev/sdc
lvcreate -L +45G -n <lv_name> <volgrp_name>
mkfs -j  /dev/<volgrp_name>/<lv_name>

So far so good.  Partitions mount up and work fine.  I've even gone
through and modified <lv_name> by removing the journal file, resizing
and remounting with good success.  My problem is now that I've added in
another disk (capacity now approx 200GB) I cannot grow the vg:

# vgextend <volgrp_name> /dev/sdc
vgextend -- INFO: maximum logical volume size is 2 Terabyte
vgextend -- ERROR: physical volume "/dev/sdc" already belongs to volume
group "<volgrp_name>"

As discussed in previous messages I could simply create a partition and
add it in.  I've gone down that road, but with the inability to grow a
physical partition (tried via parted) that too didn't work well.  To me
it doesn't seem that this should be outside of normal expectations but
there doesn't seem to be a lot of information regarding LVM and SANs.
 
Regards,
Kreig




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