On 7/12/18 9:44 am, G C wrote:
Correct we're adding a new physical device with larger capacity then
using pvmove to relocate to new device, etc...
The problem is that it takes a long time to complete the pvmove and it
out of space on the original device (hence the move) we wouldn't be
able to use the system until the migration was completed.
I am pretty sure you could just allocate space from the new PV to the
existing LV, that way, the LV will span both the old PV and the new PV.
If you are using SSD storage, then this won't matter, if you are using
spinning disks, then you might want to specifically allocate blocks from
the new PV in the physical position where it will end up when finished,
and then when you do the pvmove later, it will be contiguous with the
old and new data all on the new PV.
Does that make sense?
Regards,
Adam
On Thu, Dec 6, 2018 at 4:35 PM Adam Goryachev
<[email protected]
<mailto:[email protected]>> wrote:
On 7/12/18 9:30 am, G C wrote:
Thank you for your response.
In our scenario we're limited to a single PV on the LVM and while
online does work it takes a long time for the pvmove to complete
from say 2TB to a 3TB PV.
We're trying the offline in hopes that it would speed things up a
lot.
Sorry, I still don't understand. If you have a single PV, what are
you using pvmove for?
In my scenario, I use lvextend and then drbdadm resize.
Or do you mean you are adding additional physical devices with
larger capacity, and then using pvmove to relocate to the new
device, and then using lvextend to increase the size, and then
drbdadm resize? and instead you are planning to drbdadm down
<resource> and then fiddle with the underlying devices, and then
drbdadm up ?
Is the problem that pvmove takes a long time to complete, or that
it affects performance too much during the move? Just curious...
Regards,
Adam
On Thu, Dec 6, 2018 at 4:26 PM Adam Goryachev
<[email protected]
<mailto:[email protected]>> wrote:
On 7/12/18 8:54 am, G C wrote:
Version:
drbd84-utils.x86_64 8.9.2-1.0.1.el7
cat /proc/drbd
version: 8.4.10 (api:1/proto:86-101)
srcversion: 75EFA3DCEBEF5C771A0FCFC
Following instructions located here for offline with
internal metadata
https://docs.linbit.com/docs/users-guide-8.4/#s-resizing
I always get this error, I've found several issues that are
similar but haven't found anyway to get past this issue.
Architecture
LVM > DRBD
# drbdadm down <resource>
# drbdadm dump-md clusterdb > /tmp/metadata
Found meta data is "unclean", please apply-al first
Command 'drbdmeta 0 v08 /dev/drbd/clusterdb internal
dump-md' terminated with exit code 255
Out of interest, why do you need to use offline resize? I
always have used the online resize with no issues (LVM
underneath). Simply increase the LV (on both nodes) and then
issue a "drbdadm resize <resource>" command.
Not sure if that helps, or if you have a reason for using
offline resize, maybe someone else can assist with that.
PS, using 8.4.x versions.
Regards,
Adam
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