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Hi,
This is the approach I've also taken. As for sizing, I simply divided the nvme into a partition per HDD and colocate the WAL/DB in that partition. My understanding is that Bluestore will simply use the extra space for smaller reads/writes until it reaches capacity when it then spools out to the HDD. Graeme On 21/09/17 09:01, Dietmar Rieder wrote: Hi, I'm in the same situation (NVMEs, SSDs, SAS HDDs). I asked the same questions to myself. For now I decided to use the NVMEs as wal and db devices for the SAS HDDs and on the SSDs I colocate wal and db. However, I'm still wonderin how (to what size) and if I should change the default sizes of wal and db. Dietmar On 09/21/2017 01:18 AM, Alejandro Comisario wrote:But for example, on the same server i have 3 disks technologies to deploy pools, SSD, SAS and SATA. The NVME were bought just thinking on the journal for SATA and SAS, since journals for SSD were colocated. But now, exactly the same scenario, should i trust the NVME for the SSD pool ? are there that much of a gain ? against colocating block.* on the same SSD? best. On Wed, Sep 20, 2017 at 6:36 PM, Nigel Williams <nigel.williams@xxxxxxxxxxx <mailto:nigel.williams@xxxxxxxxxxx>> wrote: On 21 September 2017 at 04:53, Maximiliano Venesio <massimo@xxxxxxxxxxx <mailto:massimo@xxxxxxxxxxx>> wrote: Hi guys i'm reading different documents about bluestore, and it never recommends to use NVRAM to store the bluefs db, nevertheless the official documentation says that, is better to use the faster device to put the block.db in. Likely not mentioned since no one yet has had the opportunity to test it. So how do i have to deploy using bluestore, regarding where i should put block.wal and block.db ? block.* would be best on your NVRAM device, like this: ceph-deploy osd create --bluestore c0osd-136:/dev/sda --block-wal /dev/nvme0n1 --block-db /dev/nvme0n1 _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx <mailto:ceph-users@xxxxxxxxxxxxxx> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com <http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com> -- *Alejandro Comisario* *CTO | NUBELIU* E-mail: alejandro@xxxxxxxxxxx <mailto:alejandro@xxxxxxxxxxx>Cell: +54 9 11 3770 1857 _ www.nubeliu.com <http://www.nubeliu.com/> _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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