Hi Anthony-san,
Thank you for your advice. I confirm my settings of my ceph cluster.
Autoscaler mode is on, so I had thought it's the best PGs. But the
autoscaler feature doesn't affect OSD's PGs. It's just for PG_NUM in
storage pools. Is that right?
Regards,
--
Mitsumasa KONDO
2024年4月15日(月) 22:58 Anthony D'Atri <anthony.datri(a)gmail.com>om>:
If you're using SATA/SAS SSDs I would aim for
150-200 PGs per OSD as shown
by `ceph osd df`.
If NVMe, 200-300 unless you're starved for RAM.
On Apr 15, 2024, at 07:07, Mitsumasa KONDO
<kondo.mitsumasa(a)gmail.com>
wrote:
Hi Menguy-san,
Thank you for your reply. Users who use large IO with tiny volumes are a
nuisance to cloud providers.
I confirmed my ceph cluster with 40 SSDs. Each OSD on 1TB SSD has about
50
placement groups in my cluster. Therefore, each
PG has approximately 20GB
of space.
If we create a small 8GB volume, I had a feeling it wouldn't be
distributed
well, but it will be distributed well.
Regards,
--
Mitsumasa KONDO
2024年4月15日(月) 15:29 Etienne Menguy <etienne.menguy(a)ubisoft.com>om>:
> Hi,
>
> Volume size doesn't affect performance, cloud providers apply a limit to
> ensure they can deliver expected performances to all their customers.
>
> Étienne
> ------------------------------
> *From:* Mitsumasa KONDO <kondo.mitsumasa(a)gmail.com>
> *Sent:* Monday, 15 April 2024 06:06
> *To:* ceph-users(a)ceph.io <ceph-users(a)ceph.io>
> *Subject:* [ceph-users] Performance of volume size, not a block size
>
> [Some people who received this message don't often get email from
> kondo.mitsumasa(a)gmail.com. Learn why this is important at
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>
> Hi,
>
> In AWS EBS gp3, AWS says that small volume size cannot achieve best
> performance. I think it's a feature or tendency of general
> distributed storages including Ceph. Is that right in Ceph block
storage? I
> read many docs on ceph community. I never
heard of Ceph storage.
>
>
>
https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.aws.…
<https://docs.aws.amazon.com/ebs/latest/userguide/general-purpose.html>
Regard,
--
Mitsumasa KONDO
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