WAL/DB partition on system SSD

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Hello,

I wonder how good or bad is to reserve space for WAL/DB on the same SSD as OS or is it better to separate them? And what are recommended size for WAL/DB partition?

I am building Luminous cluster on Centos7 with 2 OSD per host, each OSD would be 2 * 8tb disks through LVM.

Anton.

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