[DRBD-user] DRBD Dual Primary + GFS2 for redundant KVM hosts

Digimer lists at alteeve.ca
Fri Aug 25 22:02:08 CEST 2017

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


On 2017-08-25 03:59 PM, Gionatan Danti wrote:
> Il 25-08-2017 21:46 Remolina, Diego J ha scritto:
>> Danti,
>>
>> Have you considered using something other than drbd for VM disk
>> storage? Glusterfs for example is really good for that. You may want
>> to give it a try. You should look at enabling sharding from the get-go
>> to speed up heals when a node goes down.
>>
>> I would not use Glusterfs for a file server as it's performance is
>> abysmal dealing with lots of small files. I would definitively use
>> DRBD for a file server as it is great in handling lots of small files
>> whereas Glusterfs is horrible. But for VMs, I think gluster offers
>> many niceties, easy to setup, good performance, no need to deal with
>> GFS2, etc.
>>
>> HTH,
>>
>> Diego
> 
> Hi Diego,
> sure, I have an on-going discussion with the gluster mailing list about
> how to do that.
> 
> However, having been served so well by DRBD in the last 4 years, I am
> somewhat reluctant to abandon it for another, probably not so
> battle-tested, technology.
> 
> In particular, it seems that to be useful (ie: stable enought) for VM
> disk storage, Gluster need a 3-way cluster and sharding enabled (which I
> would like to avoid). In contrast, DRBD + GFS2 (or DRBD + LVM) can be
> used in a 2-way cluster without problem.
> 
> Thanks.

To me, gluster is a cloud technology solution, where DRBD is pure
resiliency/replication. So for HA-focused platforms, DRDB makes a lot
more sense, and that is why we use it under the Anvil! platform.

-- 
Digimer
Papers and Projects: https://alteeve.com/w/
"I am, somehow, less interested in the weight and convolutions of
Einstein’s brain than in the near certainty that people of equal talent
have lived and died in cotton fields and sweatshops." - Stephen Jay Gould



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