howto prepare exclusive partition for a monitor and OSD

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Dear ceph-users,

 

I’m trying to get the ceph monitor use a exclusive partition on my ssd drive. However, how should I prepare it?

I want to do something like this:

 

Ceph-deploy mon create mynode --mon-data /dev/sda5

 

Or

 

Ceph-deploy mon create mynode:/dev/sda5

 

/dev/sda5 is a 16GB partition on a 120GB ssd with mbr-ext2(???)  formatted how should I continue…

 

Also

 

When preparing the OSD’s with a single dedicated platter disk per OSD like so:

 

Ceph-deploy disk zap mynode:/dev/sdd

 

And there is a corrupted GPT table (yes, I can do that :S ) a error is shown but the disk is not prepared.

Its not really clear what I’m zapping the disk with either ie: mbr/gpt and ext4,xfs or btrfs… it seems that fdisk doesn’t understand gpt, but disk zap tries to create a gpt table on it. I don’t think its really necessary for a 2TB to use GPT.

 

Its not clear whether or not a disk is zapped when using ceph-deploy osd prepare or ceph-deploy osd create either…

 

Then the journal for the osd disks can be set with something like

Ceph-deploy osd prepare mynode:/dev/sdd:/dev/sda6

 

But can I do this? Or should I first mount it to the /var/lib/ceph/osd directory somewhere.. and what about formatting…

 

Can anyone clarify that for me?

 

Regards,

Johannes



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