[DRBD-user] drbd implementation question
Rudi at SoftDux.com
Fri Oct 19 23:35:21 CEST 2007
----- Message from rwalker at medallion.com ---------
Date: Fri, 19 Oct 2007 09:53:20 -0400
From: "Ross S. W. Walker" <rwalker at medallion.com>
Reply-To: "Ross S. W. Walker" <rwalker at medallion.com>
Subject: RE: [DRBD-user] drbd implementation question
To: kbyrd-drbd at memcpy.com, drbd-user at lists.linbit.com
> Kelly Byrd wrote:
>> On Thu, 18 Oct 2007 18:48:56 +0200, "Rudi Ahlers"
>> <Rudi at SoftDux.com> wrote:
>> > Hi all
>> > I'm new to drbd and have some questions, hoping someone
>> could help me.
>> > like to use software RAID & LVM to make it easier to upgrade in the
>> > how do I manage such a setup?
>> > Do I first setup the RAID, then the LVM volumes and the drbd?
>> > Can I install & setup drbd on partitions with existing data?
>> What are you looking for in the end? One big replicated chunk
>> of space? Do you need smaller granularity? For the local
>> RAID, what are the requirements there? RAID0? RAID5? RAID1?
>> If you're going to run raid and lvm underneath drbd, I'm not
>> sure how you'll keep existing data. Wouldn't creating LVMs on
>> top of an existing partition with data in it destroy that
>> I'm pretty sure you can't directly create a drbd with existing
>> data, drbd is a block device, so it would run underneath a
>> filesystem. If you had a filesystem with data in it already,
>> making a drbd out of that space would screw up the filesystem
>> and the data. Just like when you create a RAID1 from existing
>> data, you copy the data into the RAID1.
> Create the RAID, whether it is HW or SW.
> Create a LVM VG out of the RAID array(s).
> Create LVM LVs out of the VG.
> You can create a drbd volume after the fact, you just CANNOT
> create it with the meta-data on that volume you have to locate
> the meta-data on a separate volume.
> I prefer to locate the meta-data separately anyways, I create
> a separate LV for drbd meta-data, and do drbd per-LV instead
> of per RAID array.
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----- End message from rwalker at medallion.com -----
Thanx for the input, Ross & Kelly
Kelly, to answer your questions:
* I'd use any level of RAID, depending on the application / use of
* I really only want to use LVM to make growing the partition size
easier. But from what I can gather, I don't need to use LVM, is that so?
Ross, I do have a question for you, on your suggestion.
Let's say I have 2x 160GB HDD's, which I mirror RAID, leaving me
with /dev/md1 (100MB) & /dev/md1 (158GB - rest = swap), now I create
my LV volumes, / (/dev/mapper/system-root) being say 8GB, /home
(/dev/mapper/system-home) being 100GB, and /opt
(/dev/mapper/system-opt) 50GB. When I setup the partitions like this
when I install the machine, all the relevant info is installed, so I
need to temporarely move the info from /home & /opt somewhere else if
I want to sync those to patitions?
And, what do I add to my drbd.conf file for those parititions? I
have tried /dev/mapper/system-home, but it doesn't seem to work. How
do I use LVM VG's with DRBD?
Cellphone: 082 554 7532
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