[Gluster-users] To RAID or not to RAID...
Strahil
hunter86_bg at yahoo.com
Tue Jan 14 15:29:10 UTC 2020
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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