Good day,

the distributed volume was created manually.

currently i'm thinking to create a replica on the two new servers which 1 server will hold 2 bricks and replace it later, then recreate the brick for the server hosting 2 bricks into 1,

also i found the image location /gluster_bricks/data/data/19cdda62-da1c-4821-9e27-2b2585ededff/images

but not sure how to transfer it to a new instance of engine

On Mon, May 10, 2021 at 4:49 PM Strahil Nikolov via Users <users@ovirt.org> wrote:

A quote from : https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.5/html/administration_guide/sect-creating_replicated_volumes

Sharding has one supported use case: in the context of providing Red Hat Gluster Storage as a storage domain for Red Hat Enterprise Virtualization, to provide storage for live virtual machine images. Note that sharding is also a requirement for this use case, as it provides significant performance improvements over previous implementations.


Also, FUSE will be able to read multiple shards from multiple bricks - so load should be properly spread among the bricks and performance is most optimal.

Also, I don't see that option in https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.5/html/configuring_red_hat_virtualization_with_red_hat_gluster_storage/app-virt_profile

How did this option got on your volume? Was this volume created by oVirt or manually ?

Best Regards,

Strahil Nikolov

It is because of a serious bug on cluster.lookup-optimize, it cause me few VM image corruption after new brick added. Although cluster.lookup-optimize theoretically impact all file not just shards. However, after ran many round verification test, corruption doesn't happen when  shards disabled. Therefore I'm interested to see why shards is essential in oVirt defaults.

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