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Another class for hdd

Hi!

I want to add large and not very fast disks to the cluster (backup and the like). CEPH has the opportunity to add its own class of devices in addition to the existing classes of HDD / SSD / NVME and build additional CRASH-RULES from these devices. I would like to know:
1. Is it possible to do this by the PETASAN himself?
2. If I start adding new classes from the command line, will I break something in PETASAN?
3. Maybe there are ideas how to do it differently?

You cannot do it via ui but you can use ceph commands directly. Like in pure ceph, the things to watch for is if you are currently using the default replicated rule rather than created new ones from provided templates, this rule will use all disks and does not filter by class, in this case you may want to modify the crush map to map existing disks to their specific class, ceph provides command to do this.

 

PetaSAN is a great management tool for CEPH. Add to the TODO list: adding this feature is a good idea. 🙂

Thanx!