[DRBD-user] DRBD w/RAID5 - Ubuntu Server

Henri Cook drbd at theplayboymansion.net
Sun Aug 10 13:31:17 CEST 2008

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

I've moved the meta disk to a RAID1 partition of ~500MB and it's working 
much better, the only limiter now is no doubt the 100mbit modem - i'll 
work on getting a crossover cable sorted!

I have this in my config, is it correct or should I be using [0] for 
both meta disks????

on alpha {
    device     /dev/drbd0;
    disk       /dev/md4;
    meta-disk  /dev/md5[0];


  on beta {
    device    /dev/drbd0;
    disk      /dev/md4;
    meta-disk /dev/md5[1];



Stefan Seifert wrote:
> On Saturday, 09. August 2008, Henri Cook wrote:
>> Dear all,
>> I've just configured a 1.8TB DRBD shared device on a pair of machines
>> connected to the same fairly standard home router (the documentation is
>> _excellent_ by the way!)
> I hope that home router at least has Gigabit., though the best connection for 
> DRBD would be a simple cable without any switch in between.

>> The two devices are synchronising now but worryingly very slowly and i'm
>> not sure if it's a RAID5 issue or what? Here's an example of /proc/drbd.
>> Eventually I want to go for a Primary/Primary setup
> Are the RAID devices themselves even synchronized yet? What does 
> cat /proc/mdstat say?
> Also: never put a drbd meta disk on a MD RAID 5. Its painfully slow (and may 
> be a reason for what you see). RAID 1 should be ok.

> Regards,
> Stefan
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