26 Mar
2021
26 Mar
'21
5:05 p.m.
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.Szabo(a)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
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Agoda Services Co., Ltd.
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-----Original Message-----
From: Marcelo <raxidex(a)gmail.com>
Sent: Thursday, March 25, 2021 11:15 PM
To: ceph-users(a)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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