[DRBD-user] Using DRBD as the Only RAID

Andreas Pflug pgadmin at pse-consulting.de
Wed Jul 23 20:51:08 CEST 2014

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

Sounds like you want to run Raid1 (drbd) over Raid0 (ssd+md?). This is 
more fragile than Raid0 over Raid1, so you might consider implementing 
Raid0 using DM over multiple drbd devices, each mirroring a single ssd.


On 07/23/14 17:45, Robinson, Eric wrote:
> We have many DRBD clusters in production and it has always worked 
> great. Our cluster nodes have always had RAID 5 arrays consisting 6x 
> spinning drives.  Recently we started using servers with SSD drives. 
> After some research, we find that RAID 5 is not recommended because it 
> (supposedly) causes write amplification and shortens the life of the 
> drives. However, we really do not want to give up storage space by 
> switching to RAID 10. We are seriously considering using RAID 0 in our 
> database servers, and using DRBD as "network RAID 1." What do you guys 
> think of that? Terrible idea?
> --
> Eric Robinson
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