[ceph-users] Re: KRBD use Luminous upmap feature.Which version of the kernel should i ues?

17 Sep 2019


      Thank you for your reply.
so,i would like to verify this problem. i create a new VM as a
client,it is kernel version:
[root@localhost ~]# uname -a
Linux localhost.localdomain 5.2.9-200.fc30.x86_64 #1 SMP Fri Aug 16
21:37:45 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

First of all,use command:ceph features in my cluster
[root@node-1 ~]# ceph features
{
    "mon": {
        "group": {
            "features": "0x3ffddff8eeacfffb",
            "release": "luminous",
            "num": 3
        }
    },
    "osd": {
        "group": {
            "features": "0x3ffddff8eeacfffb",
            "release": "luminous",
            "num": 12
        }
    },
    "client": {
        "group": {
            "features": "0x3ffddff8eeacfffb",
            "release": "luminous",
            "num": 7
        }
    }
}

now, i have no jewel client.And then,i map a rbd image to new VM
[root@localhost ~]# rbd map test
/dev/rbd0
map successful!
new,use ceph features
[root@node-1 ~]# ceph features
{
    "mon": {
        "group": {
            "features": "0x3ffddff8eeacfffb",
            "release": "luminous",
            "num": 3
        }
    },
    "osd": {
        "group": {
            "features": "0x3ffddff8eeacfffb",
            "release": "luminous",
            "num": 12
        }
    },
    "client": {
        "group": {
            "features": "0x27018fb86aa42ada",
            "release": "jewel",
            "num": 1
        },
        "group": {
            "features": "0x3ffddff8eeacfffb",
            "release": "luminous",
            "num": 7
        }
    }
}
I have a jewel client.It is not an expectation.
why? is it means i still can not use upmap feature?


Ilya Dryomov <idryomov@gmail.com> 于2019年9月16日周一 下午9:22写道：
...
On Mon, Sep 16, 2019 at 2:24 PM 潘东元 <dongyuanpan0@gmail.com> wrote:
...
hi,
   my ceph cluster version is Luminous run the kernel version Linux 3.10
   [root@node-1 ~]# ceph features
{
    "mon": {
        "group": {
            "features": "0x3ffddff8eeacfffb",
            "release": "luminous",
            "num": 3
        }
    },
    "osd": {
        "group": {
            "features": "0x3ffddff8eeacfffb",
            "release": "luminous",
            "num": 15
        }
    },
    "client": {
        "group": {
            "features": "0x40106b84a842a52",
            "release": "jewel",
            "num": 3
        },
        "group": {
            "features": "0x3ffddff8eeacfffb",
            "release": "luminous",
            "num": 170
        }
    }
}
Which version of the kernel should i ues?
You need any upstream kernel starting with 4.13 or a downstream kernel
with a backport.  For RHEL/CentOS, this is any kernel starting with 7.5
(3.10.0-862).
Thanks,
Ilya