[DRBD-user] primary/primary drbd + md + lvm

Matthew Ingersoll matth at digitalwest.net
Fri Sep 18 18:28:28 CEST 2009

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


On Sep 18, 2009, at 9:22 AM, Jürgen Scholz wrote:

> Hello!
>
>> I'm not so concerned with raid1+0 vs raid0+1 but the use of  
>> striping on the same volume between two active nodes.  Any pros/ 
>> cons for md or lvm striping? Or more specifically, are they  
>> considered safe in this setup or will corruption slowly come about?
> You shouldn't use two drbd-devices for one filesystem. If one  
> resource disconnects and the other doesn't your data will be  
> inconsistent. This setup is way to risky.
> Build your RAID on a per host base, so that you export one block- 
> device per filesystem or LVM-group. This way you won't have to face  
> more data integrity issues than necessary.
>

Indeed, unless you're using something like GFS. I stripped out any  
filesystems to simplify the example.  All testing has been done with a  
clustered filesystem.

--
Matth


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