Re: How to create multiple Ceph pools, based on drive type/size/model etc?

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Hi,

Right - but what is you have two types of NVMe drives?

I thought that there's only a fixed enum of device classes - hdd, ssd, or nvme.

You can't add your own ones, right?

Thanks,
Victor

On Thu, Sep 12, 2019 at 12:54 PM Konstantin Shalygin <k0ste@xxxxxxxx> wrote:

I have a 3-node Ceph cluster, with a mixture of Intel Optane 905P PCIe
disks, and normal SATA SSD drives.

I want to create two Ceph pools, one with only the Optane disks, and the
other with only the SATA SSDs.

When I checked "ceph osd tree", all the drives had device class "ssd".

As a hack - I was able to change the device class for the Optane drives to
"nvme", and leave the SATA SSDs as "ssd".

I then created crush rules based on device classes.

However, what if I don't want to overload device classes to achieve this,
or have more than two models of disks?

Is there an easy way to assign specific drives of a model/type/capacity to
different pools?
It's already simple way to do that - device classes.

It's like 8021q in networks.



k

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