[DRBD-user] Resize DRBD / XFS without LVM

cosmih cosmih at gmail.com
Wed Dec 2 09:18:24 CET 2009

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Hi Stefan,

Are you so kind to detail a little bit more the growing process
(because on the URL provided is vague) ? The steps are something likes
below ?
1) put the DRBD resources into secondary mode (on each server)
2) stop the DRBD service on each server
3) resize the disk partition used for the DRBD devices on each server
(the disk partition used as meta-disk is not modified)
4) start the DRBD service on each server (at this step the two DRBD
devices will be into secondary mode)
5) put one DRBD device into primary mode
6) resize the filesystem on top the primary DRBD device

Thank you,


On Tue, Dec 1, 2009 at 2:56 PM, Stefan Priebe - allied internet ag
<s.priebe at allied-internet.ag> wrote:
> Hi!
> I've done an offline migration cause - we don't use LVM and without LVM
> online migration is not possible.
> So i can only tell you that the offline one
> (http://www.drbd.org/users-guide/s-resizing.html) is working fine :-)
> Stefan
> cosmih schrieb:
>> Hi Stefan,
>> Do you succeed on your XFS, on top of DRBD, growth attempt ?
>> I am curious on this because I also need to do a growth of my DRBD device.
>> Here is my setup:
>> 1) Heartbeat standby/active over DRBD secondary/primary setup
>> 2) DRBD 8.0.16
>> 3) HW RAID 10 --> sda6, 350GB disk partition; sda7, 1GB disk partition
>> --> drbd0, DRBD device on sda6; meta-disk on sda7  --> LVM PV --> one
>> LVM VG --> two LVM LV --> ext3 (meaning that the DRBD device use as
>> its storage a disk partition and there is LVM on top of DRBD and there
>> is ext3 on top of LVM)
>> What I need ?
>> Basically, I need more space on DRBD device, meaning from 350GB to
>> 450GB and I have this free space on HW RAID 10 volume.
>> Because the DRBD setup is used by some applications who need a very
>> high uptime I am interested by a solution for this growth who use the
>> secondary/primary feature of DRBD and the standby/active feature of
>> heartbeat or, at least, need a very low downtime.
>> I would appreciate any advices.
>> Thank you,
>> --
>> cosmih
>>> Hi!
>>> Yes of cause HW Raid.
>>> I'll do a test today - i've already prepared testequipment yesterday.
>>> Stefan
>>>> Stefan Seifert schrieb:
>>>> On Tuesday 24 November 2009 11:03:11 you wrote:
>>>>>> No you haven't. Like newer versions of fdisk you can use partprobe to
>>>>>> tell the kernel to re-read partition tables.
>>>>>> Regards,
>>>>>> Stefan
>>>>> Thanks Stefan for your answer. I know partprobe - but does it work on a
>>>>> mounted partition?
>>>> For all I know it should work with a mounted partition as well. If the
>>>> partition were not mounted or otherwise used, you wouldn't need partprobe.
>>>> And I assume "mounted" in this context means "used as drbd storage device".
>>>> I also assume that by RAID you mean some hardware RAID, because partitioning
>>>> an MD RAID wouldn't make much sense.
>>>> Like with all these things it's a very good idea to first test it on a test
>>>> system. Ideally identical machines, but if not available at least some VM (we
>>>> use qemu for that and though its pretty slow, its enough for such tests). Life
>>>> gets so much more relaxed, if you don't have to experiment around with your
>>>> production machines :)
>>>> Regards,
>>>> Stefan
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