[DRBD-user] Resize DRBD / XFS without LVM

cosmih cosmih at gmail.com
Tue Dec 1 12:41:55 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,

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,

>Yes of cause HW Raid.
>I'll do a test today - i've already prepared testequipment yesterday.
>>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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