Re: After kernel upgrade OSD's on different disk.

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After the kernel upgrade, I also upgraded the cluster to 10.2.3 from
10.2.2.
Let's hope I only hit a bug and that this bug is now fixed, on the other
hand, I think I also saw the issue with a 10.2.3 node, but I'm not sure.

Jan Hugo


On 10/31/2016 11:41 PM, Henrik Korkuc wrote:
> this is normal. You should expect that your disks may get reordered
> after reboot. I am not sure about your setup details, but in 10.2.3
> udev should be able to activate your OSDs no matter the naming (there
> were some bugs in previous 10.2.x releases)
>
> On 16-10-31 18:32, jan hugo prins wrote:
>> Hello,
>>
>> After patching my OSD servers with the latest Centos kernel and
>> rebooting the nodes, all OSD drives moved to different positions.
>>
>> Before the reboot:
>>
>> Systemdisk: /dev/sda
>> Journaldisk: /dev/sdb
>> OSD disk 1: /dev/sdc
>> OSD disk 2: /dev/sdd
>> OSD disk 3: /dev/sde
>>
>> After the reboot:
>>
>> Systemdisk: /dev/sde
>> journaldisk: /dev/sdb
>> OSD disk 1: /dev/sda
>> OSD disk 2: /dev/sdc
>> OSD disk 3: /dev/sdd
>>
>> The result was that the OSD didn't start at boot-up and I had to
>> manually activate them again.
>> After rebooting OSD node 1 I checked the state of the Ceph cluster
>> before rebooting node number 2. I found that the disks were not online
>> and I needed to fix this. In the end I was able to do all the upgrades
>> etc, but this was a big surprise to me.
>>
>> My idea to fix this is to use the Disk UUID instead of the dev name
>> (/dev/disk/by-uuid/<uuid> instead of /dev/sda) when activating the disk.
>> But I really don't know if this is possible.
>>
>> Could anyone tell me if I can prevent this issue in the future?
>>
>
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-- 
Met vriendelijke groet / Best regards,

Jan Hugo Prins
Infra and Isilon storage consultant

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