[DRBD-user] Resize DRBD / XFS without LVM

cosmih cosmih at gmail.com
Wed Dec 2 10:10:55 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,

I mean the offline growing, because from the information available on
the specified URL I understands that the online rezise is possible
only when the DRBD device is on top of a LVM volume.

Thank you,


On Wed, Dec 2, 2009 at 10:46 AM, Stefan Priebe - allied internet ag
<s.priebe at allied-internet.ag> wrote:
> Hi!
> Do you mean the offline growing or online growing? About the online
> growing i don't know anything :-) I haven't tested it at all.
> Stefan
> cosmih schrieb:
>> 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,
>> --
>> cosmih
>> 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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