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.
Regards,
Andreas
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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