Gluster users - Aug 2020 - Gluster cluster questions

Hi Volker,
> On 19-Aug-2020, at 4:51 PM, Volker Dormeyer <vd at d7informatics.de>
wrote:
> 
> Hello All,
> 
> I am new to this list.
> 
> I am planning do create a cluster with several Gluster nodes. I get to
> the following questions:
> 
> a) Is it possible to build a cluster with some of the bricks as SSD and
> some of them with HDD? In the end I want two separate pools one fast
> pool with SSD storage and a second slow pool with HDD. Is there a way to
> define a scenario like this in Gluster? The question is not related to
> SSD caching.
Cluster in GlusterFS is only required to create group of nodes which can be used
to provision Volumes as required. Disks are not tied to Cluster. Volumes can be
created as required. For example, Create a Volume using HDD and create another
volume using SSD. (I am not sure this flexibility is available in Heketi or not,
may be that supports tagging the devices and provision using those tags)
> 
> b) Or, shall I spilt this in two clusters of Gluster, one fast the
> another one slow.
As answered above, Splitting the Cluster is not required. Create two Volumes.
> 
> My imagination is to build something like this:
> 
> 
> Kubernetes Cluster 1    ...    Kubernetes Cluster N
>          |                              |
>  storage class slow     <->     storage class fast
> 
> -----------------------------------------------------
>                      \        /
>                        Heketi
>                      /        \
>    Gluster 1 (fast)              Gluster 2 (slow)
https://kadalu.io <https://kadalu.io/> can be used as alternative to
Heketi to use GlusterFS with Kubernetes. Create two Storage pools one with SSD
and another with HDD, and create Storage class to use these pools.

https://kadalu.io/docs/k8s-storage/latest/storage-classes
<https://kadalu.io/docs/k8s-storage/latest/storage-classes>
 
> 
> 
> Best Regards,
> Volker
> 
> ________
> 
> 
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Aravinda Vishwanathapura
https://kadalu.io



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Hi Aravinda,

Thank you!!

On 8/19/20 1:47 PM, Aravinda VK wrote:
> https://kadalu.io?can be used as alternative to Heketi to use
> GlusterFS with Kubernetes. Create two Storage pools one with SSD and
> another with HDD, and create Storage class to use these pools.
>
> https://kadalu.io/docs/k8s-storage/latest/storage-classes
This sounds promising! I read through the documentation. A few questions
came up:

1. I need Kubernetes on the storage cluster? Right? This would be a good
thing.

2. Which components are required on the client Cluster? I mean the
Kubernetes Clusters which make use of the storage cluster? At least a
client to mount the storage would be required.

3. How far is the ARM64 implementation??

This is from the github site:

The release versions and 'latest' versions are not yet ARM ready! But we
have an image for |linux/arm64|,|linux/arm/v7| platform support!


Best Regards,
Volker