[DRBD-user] drbd on raid 5

Diego Julian Remolina diego.remolina at ibb.gatech.edu
Thu Aug 24 16:09:38 CEST 2006

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


There should be a performance hit if you are using protocol C. Remember 
that in protocol C, writes are not considered committed unless you have 
written to both machines. So if your primary has a super fast raid 
controller that can give you writes in the order or greater than100MB/s 
and the other computer simply has a single drive that can only do say 30 
MB/s then your will be limited to the speed of the second node. Reads 
don't really matter as there is no data needed to be replicated during 
reads. I am not sure, but I think I read before that there is some magic 
in the drbd code where host 1 could read through the DRBD connection 
data on host 2 or something like that, but I may be totally wrong.

Diego


khaja mohideen wrote:
> Hi,
>
>   The primary server(Host A) runs on Hardware RAID5.
> The Secondary Server (Host B) runs on non RAID.  Can i
> use drbd effectively. Any Impacts(read/write) or
> considerations before implementing this.
>
>
>    Pls Suggest.
>
> Regards,
>
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