OK to Extend LV Under DRBD?

[Robinson, Eric-2]

Hi all!

I have my drbd disk on a logical volume that is running out of space.

    device     /dev/drbd0;
    disk       /dev/vg01/lv01;

drbd0 is 400GB and about 80% full.

Is there any danger or issues of concern if I want to simply extend
logical volume lv01 and thus increase the size of device drbd0? Can this
be done "live," or is there a special procedure? Will this have any
implications for the ext3 filesystem mounted on drbd0?

Also, as a separate question, are there any performance or reliability
issues that I should know about that occur when drbd disks start filling
up?

--
Eric Robinson


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[Mark Watts]

On Wed, 2009-11-04 at 03:36 -0800, Robinson, Eric wrote:

> Hi all!
>
> I have my drbd disk on a logical volume that is running out of space.
>
>     device     /dev/drbd0;
>     disk       /dev/vg01/lv01;
>
> drbd0 is 400GB and about 80% full.
>
> Is there any danger or issues of concern if I want to simply extend
> logical volume lv01 and thus increase the size of device drbd0? Can this
> be done "live," or is there a special procedure? Will this have any
> implications for the ext3 filesystem mounted on drbd0?

Resizing (On and Off Line) is detailed here:

http://www.drbd.org/users-guide-emb/s-resizing.html

> Also, as a separate question, are there any performance or reliability
> issues that I should know about that occur when drbd disks start filling
> up?

DRBD just replicates blocks; there is no concept of a "full" DRBD block
device since it is only concerned with replicating dirty blocks.

Of course, the file system running on-top of DRBD may have its own
issues when it fills up, but those are not linked to DRBD.

Mark.

--
Mark Watts BSc RHCE MBCS
Senior Systems Engineer, Managed Services Manpower
www.QinetiQ.com
QinetiQ - Delivering customer-focused solutions
GPG Key: http://www.linux-corner.info/mwatts.gpg


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