[Gluster-users] To RAID or not to RAID...

[Strahil]

Hi Markus,

Distributed dispersed volume is just LVM's linear LV -> so in case of brick failiure - you loose the data on it.

Raid 6 requires  2 disks  for parity, so you can make a large RAID6 and use that as a single brick - so the disks that hold  the parity data are  only 6 ( 3 nodes x 2 disks).

Of course  if you have too many disks  for a single raid controller ,that you can consider a  replica volume  with an arbiter.


Best Regards,
Strahil Nikolov

On Jan 14, 2020 13:36, Markus Kern <gluster at military.de> wrote:
>
>
> Greetings again! 
>
> After reading RedHat documentation regarding optimizing Gluster storage 
> another question comes to my mind: 
>
> Let's presume that I want to go the distributed dispersed volume way. 
> Three nodes which two bricks each. 
> According to RedHat's recommendation, I should use RAID6 as underlying 
> RAID for my planned workload. 
> I am frightened by that "waste" of disks in such a case: 
> When each brick is a RAID6, I would "loose" two disks per brick - 12 
> lossed disks in total. 
> In addition to this, distributed dispersed volume adds another layer of 
> lossed disk space. 
>
> Am I wrong here? Maybe I didn't understand the recommendations wrong? 
>
> Markus 
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