[Gluster-users] Tiered storage feature

Schlick Rupert Rupert.Schlick at ait.ac.at
Wed Jan 27 08:02:19 UTC 2021

Thanks for the response.
LVM caching seems like a sensible solution, although compared to the hot/cold separation of tiered volumes, it actually reduces the overall storage capacity.

Does LVM caching work cleanly with Gluster’s snapshot feature?


Von: Olaf Buitelaar <olaf.buitelaar at gmail.com>
Gesendet: Dienstag, 26. Januar 2021 21:34

Dear Schlick,

It's indeed dropped, I think it's in favor of more native options. The go to replacement is lvm-cache (https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/logical_volume_manager_administration/lvm_cache_volume_creation).
This places just an amount of SSD storage as a cache layer in-front of your HDDs, using device mapping.

If you're into ansible, you could use these play's; https://github.com/gluster/gluster-ansible-infra
it seems to operate pretty stable.



Op di 26 jan. 2021 om 20:34 schreef Schlick Rupert <Rupert.Schlick at ait.ac.at<mailto:Rupert.Schlick at ait.ac.at>>:
Dear List,

could anyone enlighten me what happened to the tiered storage feature?

When finding references to it online, it seemed to be the perfect solution for my problem, but further digging shows it was removed in gluster 6.

What digging did not show is why it was removed and if there are any suggestions to solve the issue of having fast and slow storage with glusterfs.

I’m looking for a distributed storage for a small cluster (for now 3 nodes, 4 fast GPUs each). Space on NVMe SSDs is limited, the nodes are interconnected with 100Gb Infiniband.
Gluster seemed to be the perfect solution to mirror between the nodes, until I realized that tiered volumes are not supported anymore.

The removal baffles me a bit, since alternatives available under open-source licenses like MooseFS, BeeGFS, CEPH, Lustre have also solutions for hierarchical storage management in some form and the use case seems to be a common one.




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