Does it make sense to have separate HDD based DB/WAL partition

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Dear Ceph folks,

I am faced with a special use Ceph scenario, where no SSD is available. Three node Ceph cluster, each with 14 HDDs, no SSD. In this case, should i create a separate DB/WAL partition for each OSD on a HDD? and if yes, how big the partition?

Which is the best in terms of performance, with a separate DB/WAL partition, or without?

Thanks a lot,

samuel





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