In <[🔎] 4A5D2A14.9000108@cox.net>, Ron Johnson wrote:
>On 2009-07-13 14:24, Boyd Stephen Smith Jr. wrote:
>> In <[🔎] 4A5B841E.7010900@cox.net>, Ron Johnson wrote:
>>>> In your case, you'll have to add at least 3 of the new PVs to the VG
>>>> before pvmove will let you begin. Are you going to move swap onto
>>>> LVM? If not, make sure your partition table for the new drive still
>>>> has space for swap.
>>
>> If you have a VG that is on /dev/sda2 and /dev/sdb and you want to move
>> it (and, of course, all the LVs it contains) to /dev/sdc1, /dev/sdc2,
>> /dev/sdc3, and /dev/sdc4, you do:
>
>Here's the difference: your example assumes inserting the new hard
>drive and then moving the old data to it.
Based on my quoting of you, I'd say that is the case you are in as well.
>I don't yet have the new hard drive, and want to get all the data
>off of the old drive first.
Do you have enough free PEs in your VG to do that? It might not be
possible.
Here's a script that will tell you:
pvs -o name,pe_count,pe_alloc_count --noheadings |
awk '
BEGIN { device="/dev/sda5"; free=0; need=0; }
$1 = device { need += $3; }
$1 != device { free += ($2 - $3); }
END {
printf "need = %d\n", need;
printf "free = %d\n", free;
printf "Can%s reallocate extents on %s.\n",
(need <= free ? "" : "not"), device;
}
'
You'll need to change the device on line 3 and run the whole thing as root.
Assuming you have enough space, it should be as simple as:
vgreduce $vg $failing_device
# Remove device
# Add new device
vgextend $vg $new_device
# If you want, pvmove LVs around.
--
Boyd Stephen Smith Jr. ,= ,-_-. =.
bss@iguanasuicide.net ((_/)o o(\_))
ICQ: 514984 YM/AIM: DaTwinkDaddy `-'(. .)`-'
http://iguanasuicide.net/ \_/
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