Re: [Octopus] Beware the on-disk conversion

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(fsck / quick-fix, same story)

On 4/2/20 3:12 PM, Jack wrote:
> Hi,
> 
> A simple fsck eats the same amount of memory
> 
> Cluster usage: rbd with a bit of rgw
> 
> Here is the ceph df detail
> All OSDs are single rusty devices
> 
> On 4/2/20 2:19 PM, Igor Fedotov wrote:
>> Hi Jack,
>>
>> could you please try the following - stop one of already converted OSDs
>> and do a quick-fix/fsck/repair against it using ceph_bluestore_tool:
>>
>> ceph-bluestore-tool --path <path to osd> --command quick-fix|fsck|repair
>>
>> Does it cause similar memory usage?
>>
>> You can stop experimenting if quick-fix reproduces the issue.
>>
>>
>> Also could you please describe your cluster and its usage a bit: what's
>> the usage: rgw/rbd/cephfs? If possible - please share 'ceph df detail'
>> output, do you have standalone DB volume at SSD/NVMe?
>>
>> Thanks,
>>
>> Igor
>>
>>
>> On 4/1/2020 6:28 PM, Jack wrote:
>>> Hi,
>>>
>>> As the upgrade documentation tells:
>>>> Note that the first time each OSD starts, it will do a format
>>>> conversion to improve the accounting for “omap” data. This may
>>>> take a few minutes to as much as a few hours (for an HDD with lots
>>>> of omap data). You can disable this automatic conversion with:
>>> What the documentation does not say is that this process takes a lot of
>>> memory
>>>
>>> I am upgrading a rusty cluster from Nautilus, you can check out the ram
>>> consumption as attachment
>>>
>>> First, we have a 3TB osd conversion: it tooks ~15min, and 19GB of memory
>>>
>>> Then, we have a larger 6TB osd conversion: it tooks more than 2 hours,
>>> and 35GB of memory
>>>
>>> Finally, you have the largest 10TB osd: only 1H15, but 52GB of memory
>>>
>>>
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> 
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