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

Henri Cook drbd at theplayboymansion.net
Sat Aug 9 18:55:32 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.

Hi Stefan,

Thanks for your response.

The home router probably isn't gigabit, although the NICs in each 
machine are - good point.

/proc/mdstat reveals that the 1.8TB raid5s are also still synchronising 
- so I guess that'll be impacting DRBD sync speed

Do meta disks swell with disk size? I have a 500MB RAID1 /boot partition 
which I could jam it on, or should I create a (much larger?) RAID1 
partition dedicated to this purpose?



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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