[DRBD-user] DRBD + LVM2 Setup on RHEL5.1

Chris Raver chris at alphabay.com
Fri Mar 21 18:02:20 CET 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Here's my new config.  I ran pvcreate /dev/sda3 and created a Volume Group called VolGroup01 and a Logical Volume called LogVol00.  I ran mke2fs /dev/drbd0 and was able to mount the filesystem. But it doesn't appear to be syncing with the other node.  I'm not sure if it's because it's just not done with the initial sync or if I did something wrong.  The output of cat /proc/drbd is below.

  on qa1r2cls {
    device    /dev/drbd0;
    disk      /dev/VolGroup01/LogVol00;
    address   10.1.50.202:7789;
    meta-disk internal;
  }
  on qa1r3cls {
    device    /dev/drbd0;
    disk      /dev/VolGroup01/LogVol00;
    address   10.1.50.203:7789;
    meta-disk internal;
  }

version: 8.2.5 (api:88/proto:86-88)
GIT-hash: 9faf052fdae5ef0c61b4d03890e2d2eab550610c build by root at qa1r2cls, 2008-
03-20 18:46:40
 0: cs:SyncSource st:Primary/Primary ds:UpToDate/Inconsistent C r---
    ns:1540676 nr:609708 dw:1219368 dr:931310 al:278 bm:57 lo:0 pe:0 ua:0 ap:0
        [>...................] sync'ed:  9.9% (9899/10979)M
        finish: 8:12:46 speed: 332 (376) K/sec
        resync: used:0/31 hits:101691 misses:144 starving:0 dirty:0 changed:144
        act_log: used:0/127 hits:152137 misses:287 starving:0 dirty:9 changed:278

-----Original Message-----
From: drbd-user-bounces at lists.linbit.com [mailto:drbd-user-bounces at lists.linbit.com] On Behalf Of Chris Raver
Sent: Friday, March 21, 2008 9:29 AM
To: drbd-user at lists.linbit.com
Subject: RE: [DRBD-user] DRBD + LVM2 Setup on RHEL5.1

I think this will change my configuration because I am planning on using LMV2.  If my config looks something like this:

Perhaps something like:

   on alice {
     device /dev/drbd0;
     disk   /dev/vg_01/lv_r0;
     ...

When I run pvcreate do I use /dev/sda3 and create a volume group called vg_01. Or do I run pvcreate /dev/drbd0 (which isn't working right now).



-----Original Message-----
From: drbd-user-bounces at lists.linbit.com [mailto:drbd-user-bounces at lists.linbit.com] On Behalf Of Andy Diller
Sent: Friday, March 21, 2008 8:58 AM
To: Florian Haas
Cc: drbd-user at lists.linbit.com
Subject: Re: [DRBD-user] DRBD + LVM2 Setup on RHEL5.1

Perhaps something like:

   on alice {
     device /dev/drbd0;
     disk   /dev/vg_01/lv_r0;
     ...

Would make more sense.

Anyone working w/ LVM will not be using the /dev/sd[x] or /dev/hd[x] obviously.


-andy


----- "Florian Haas" <florian.haas at linbit.com> wrote:

> > What device is /dev/drbd/r0? Most block devices in RHEL are going to
> be
> > /dev/sd[a-d] (SCSI or SATA) or /dev/hd[a-d] (IDE).
>
> Ouch, I hadn't realized that part of the user's guide was so easily
> misunderstood.
>
> resource r0 {
>   ...
>   on alice {
>     device /dev/drbd0;
>     disk   /dev/drbd/r0;
>     ...
>   }
>   on bob {
>     device /dev/drbd0;
>     disk   /dev/drbd/r0;
>     ...
>   }
> }
>
> This means the backing devices are LVM logical volumes named "r0" in a
> Volume Group named "drbd". It says so in the text above the config
> snippet, but apparently that is easily overlooked.
>
> I will change this to a generic foo/bar "naming convention" to avoid
> confusion.
>
> Thanks for pointing this out.
>
> Cheers,
> Florian
>
> --
> : Florian G. Haas
> : LINBIT Information Technologies GmbH
> : Vivenotgasse 48, A-1120 Vienna, Austria
>
> When replying, there is no need to CC my personal address.
> I monitor the list on a daily basis. Thank you.
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