[DRBD-user] Resize DRBD / XFS without LVM

Stefan Priebe - allied internet ag s.priebe at allied-internet.ag
Wed Dec 2 09:46:33 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.


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.


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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