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@gmail.com>:
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@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@ubisoft.com>:
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@gmail.com> *Sent:* Monday, 15 April 2024 06:06 *To:* ceph-users@ceph.io <ceph-users@ceph.io> *Subject:* [ceph-users] Performance of volume size, not a block size
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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://docs.aws.amazon.com/ebs/latest/userguide/general-purpose.html>
Regard, -- Mitsumasa KONDO _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io
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