[DRBD-user] Resize DRBD / XFS without LVM

Stefan Priebe - allied internet ag s.priebe at allied-internet.ag
Tue Dec 1 13:56:17 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.


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 :-)


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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