SSDs don't work like that. If you have a 100GB SSD and a 10GB partition and don't use the rest of your disk... your 10GB partition isn't limited to 10% of the total SSDs speed. You can use the full speed of the SSD with the 10GB partition. There is literally no difference if you have 3x 5GB partitions or a single 15GB partition if they are being used for the same purpose.
On Wed, Jun 7, 2017 at 3:29 PM Lazuardi Nasution <mrxlazuar...@gmail.com> wrote: > HI Reed, > > That is what I'm doing right now, separate journal SSD partition for each > OSD HDD. I just thinking of possibility to have better peak write > performance without consuming more SSD capacity due to possibility of using > larger journal of an OSD if other OSDs don't use it at same time. For > example, if I have 3 OSDs each with 5GB journal partition, the write > performance will be limited of 5GB journal. If I can make it as 15GB single > journal partition for all OSDs, I think I can have 15GB peak write > performance possibility if only one OSD writes at the same time (or 7.5GB > peak write performance if 2 OSD write at the same time) without consuming > more SSD capacity. On reality, not all OSDs write at same time, right? > > Best regards, > > On Thu, Jun 8, 2017 at 2:09 AM, Reed Dier <reed.d...@focusvq.com> wrote: > >> As far as I am aware, you need separate logical partitions for each OSD’s >> journal. >> >> So I have an NVMe drive that serves as a journal for 10 OSD’s, thus I >> have 10 separate partitions, 1 for each OSD. >> >> Hope that helps, >> >> Reed > > >> >> > On Jun 7, 2017, at 1:54 PM, Lazuardi Nasution <mrxlazuar...@gmail.com> >> wrote: >> > >> > Hi, >> > >> > Is it possible to have single external journal for more than one OSD >> without doing any partitioning or at least only single partition on journal >> disk? For example, I want to have single SSD as external journal for some >> OSD HDDs but without doing any partitioning or at least only single >> partition on SSD. >> > >> > Best regards, >> >> _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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