Is Wal device missing? Do I need to run bluefs-bdev-new-db and Wal?
Greets,
Stefan
> Am 24.04.2020 um 11:32 schrieb Stefan Priebe - Profihost AG <s.priebe@xxxxxxxxxxxx>:
>
> Hi Igor,
>
> there must be a difference. I purged osd.0 and recreated it.
>
> Now it gives:
> ceph tell osd.0 bench
> {
> "bytes_written": 1073741824,
> "blocksize": 4194304,
> "elapsed_sec": 8.1554735639999993,
> "bytes_per_sec": 131659040.46819863,
> "iops": 31.389961354303033
> }
>
> What's wrong wiht adding a block.db device later?
>
> Stefan
>
>> Am 23.04.20 um 20:34 schrieb Stefan Priebe - Profihost AG:
>> Hi,
>> if the OSDs are idle the difference is even more worse:
>> # ceph tell osd.0 bench
>> {
>> "bytes_written": 1073741824,
>> "blocksize": 4194304,
>> "elapsed_sec": 15.396707875000001,
>> "bytes_per_sec": 69738403.346825853,
>> "iops": 16.626931034761871
>> }
>> # ceph tell osd.38 bench
>> {
>> "bytes_written": 1073741824,
>> "blocksize": 4194304,
>> "elapsed_sec": 6.8903985170000004,
>> "bytes_per_sec": 155831599.77624846,
>> "iops": 37.153148597776521
>> }
>> Stefan
>>> Am 23.04.20 um 14:39 schrieb Stefan Priebe - Profihost AG:
>>> Hi,
>>> Am 23.04.20 um 14:06 schrieb Igor Fedotov:
>>>> I don't recall any additional tuning to be applied to new DB volume. And assume the hardware is pretty the same...
>>>>
>>>> Do you still have any significant amount of data spilled over for these updated OSDs? If not I don't have any valid explanation for the phenomena.
>>>
>>> just the 64k from here:
>>> https://tracker.ceph.com/issues/44509
>>>
>>>> You might want to try "ceph osd bench" to compare OSDs under pretty the same load. Any difference observed
>>>
>>> Servers are the same HW. OSD Bench is:
>>> # ceph tell osd.0 bench
>>> {
>>> "bytes_written": 1073741824,
>>> "blocksize": 4194304,
>>> "elapsed_sec": 16.091414781000001,
>>> "bytes_per_sec": 66727620.822242722,
>>> "iops": 15.909104543266945
>>> }
>>>
>>> # ceph tell osd.36 bench
>>> {
>>> "bytes_written": 1073741824,
>>> "blocksize": 4194304,
>>> "elapsed_sec": 10.023828538,
>>> "bytes_per_sec": 107118933.6419194,
>>> "iops": 25.539143953780986
>>> }
>>>
>>>
>>> OSD 0 is a Toshiba MG07SCA12TA SAS 12G
>>> OSD 36 is a Seagate ST12000NM0008-2H SATA 6G
>>>
>>> SSDs are all the same like the rest of the HW. But both drives should give the same performance from their specs. The only other difference is that OSD 36 was directly created with the block.db device (Nautilus 14.2.7) and OSD 0 (14.2.8) does not.
>>>
>>> Stefan
>>>
>>>>
>>>> On 4/23/2020 8:35 AM, Stefan Priebe - Profihost AG wrote:
>>>>> Hello,
>>>>>
>>>>> is there anything else needed beside running:
>>>>> ceph-bluestore-tool --path /var/lib/ceph/osd/ceph-${OSD} bluefs-bdev-new-db --dev-target /dev/vgroup/lvdb-1
>>>>>
>>>>> I did so some weeks ago and currently i'm seeing that all osds originally deployed with --block-db show 10-20% I/O waits while all those got converted using ceph-bluestore-tool show 80-100% I/O waits.
>>>>>
>>>>> Also is there some tuning available to use more of the SSD? The SSD (block-db) is only saturated at 0-2%.
>>>>>
>>>>> Greets,
>>>>> Stefan
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