On 13/06/18 01:03, Konstantin Shalygin wrote:
Each node now has 1 SSD with the OS and the BlockDBs and 3 HDDs with
bluestore data.
Very. Very bad idea. When your ssd/nvme dead you lost your linux box.
I have 3 boxes. And I'm installing a new one. Any box can be lost
without data problem.
If any SSD is lost I will just reinstall the whole box, still have data
duplicates and in about 40 hours the triplicates will be ready.
I understand the HIERARCHICAL crush map works this way. If I have 3
copies and 3 hosts, any host can be lost without problem (I now reboot
any host for maintenance and nobody notices it)
Please correct me if I'm wrong.
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