Re: 6 osds on 2 hosts, does Ceph always write data in one osd on host1 and replica in osd on host2?

[Ashley Merrick <ashley@xxxxxxxxxxxxxx>]

Hello,

Will need to see a full export of your crush map rules.

Depends what the failure domain is set to.

,Ash

Sent from my iPhone

On 26 Jun 2017, at 4:11 PM, Stéphane Klein <contact@xxxxxxxxxxxxxxxxxxx> wrote:

Hi,

I have this OSD:

root@ceph-storage-rbx-1:~# ceph osd tree

ID WEIGHT   TYPE NAME                   UP/DOWN REWEIGHT PRIMARY-AFFINITY

-1 21.70432 root default

-2 10.85216     host ceph-storage-rbx-1

 0  3.61739         osd.0                    up  1.00000          1.00000

 2  3.61739         osd.2                    up  1.00000          1.00000

 4  3.61739         osd.4                    up  1.00000          1.00000

-3 10.85216     host ceph-storage-rbx-2

 1  3.61739         osd.1                    up  1.00000          1.00000

 3  3.61739         osd.3                    up  1.00000          1.00000

 5  3.61739         osd.5                    up  1.00000          1.00000

with:

      osd_pool_default_size: 2

      osd_pool_default_min_size: 1

Question: does Ceph always write data in one osd on host1 and replica on host2?

I fear that Ceph sometime write data on osd.0 and replica on osd.2.

Best regards,

Stéphane

--

Stéphane Klein <contact@xxxxxxxxxxxxxxxxxxx>
blog: http://stephane-klein.info
cv : http://cv.stephane-klein.info
Twitter: http://twitter.com/klein_stephane

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