This is exactly the problem, so we thought about not risking losing the
entire host by using both NVMes.
From what I understand the bucket index data is stored in the omap, which
is stored in the block.db, making it unnecessary to create a separate OSD
for the bucket index. But I didn't find anything in the documentation about
it.
It is also unclear whether, if it is necessary to create a separate index
pool, it would be recommended to place the OSD that serves that pool with
wal / DB.
Em qui., 25 de mar. de 2021 às 22:42, Szabo, Istvan (Agoda) <
istvan.sz...@agoda.com> escreveu:
> In couple of documentation that I've read I finally made the decision to
> separate index from wal+db.
> However don't you think that the density is a bit high with 12HDD for 1
> nvme? So if you loose nvme you actually loose your complete host and a lot
> of data movements will happen.
>
> Istvan Szabo
> Senior Infrastructure Engineer
> ---
> Agoda Services Co., Ltd.
> e: istvan.sz...@agoda.com
> ---
>
> -Original Message-
> From: Marcelo
> Sent: Thursday, March 25, 2021 11:15 PM
> To: ceph-users@ceph.io
> Subject: [Suspicious newsletter] [ceph-users] bucket index and WAL/DB
>
> Hello everybody.
>
> I searched in several places and I couldn't find any information about
> what the best bucket index and WAL / DB organization would be.
>
> I have several hosts consisting of 12 HDDs and 2 NVMes, and currently one
> of the NVMes serves as WAL / DB for the 10 OSDs and the other NVMe is
> partitioned in two, serving as 2 OSDs to serve the S3 index pool.
>
> I saw in ceph-ansible a playbook (infrastructure-playbooks /
> lv-create.yml) that creates a division where we have an OSD living with a
> journal on the same NVMe. The problem is that in lv-vars.yaml used by
> lv-create.yml it is said that this only applies to the filestore. Is this
> correct or can I use this same structure with bluestore?
>
> Thank you all,
> Marcelo.
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