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 > -- _________________________________________ D i e t m a r R i e d e r, Mag.Dr. Innsbruck Medical University Biocenter - Division for Bioinformatics Innrain 80, 6020 Innsbruck Phone: +43 512 9003 71402 Fax: +43 512 9003 73100 Email: dietmar.rieder@xxxxxxxxxxx Web: http://www.icbi.at
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