[lustre-discuss] User find out OST configuration

[Anna Fuchs]

Thanks!

Is it planned to introduce some metric propagation to the user?
For advanced users who are benchmarking stuff on remote systems it 
remains unclear which performance to expect if they can not access 
underlaying hardware metrics.
Sure, they can ask the admin to share the config, but it might be more 
convenient to be able to look it up, maybe.

Additionally: if I try to find out the stripe location (lfs gestripe) 
and map this information to OST-specs (lctl get_param 
osc.*.*ost_conn_uuid), to find out how many different servers and 
networks are involved, the obdidx seems to be in dec-format, but the OST 
index in connections list is hex, which is not always obvious.
Is there a way to display it both in dec or both in hex?

Are there generally any tools for doing similar things?
We plan a student project for building kind of GUI for visualizing 
stripings and mappings, so I would try to avoid reinventing the wheel.

Thank you.

Best regards
Anna

Am 21.01.2023 um 17:08 schrieb Andreas Dilger:
> Hi Anna,
> Beyond the number and size of OSTs and MDTs there isn't much 
> information about the underlying storage available on the client.
>
> The "lfs df -v" command will print a "f" at the end for flash 
> (non-rotational) devices, if the storage is properly configured.  The 
> "osc*.imports " parameter file will contain some information about the 
> grant_block_size that can be used to distinguish ldiskfs (4096) vs. 
> zfs backends (131072 or 1048576).
>
> The size of the disks can often be inferred from 1/8 of the total OST 
> size for standard 8+2 RAID configs, but this may vary and no actual 
> device-level metrics are available on the client.
>
> Even on the server, Lustre itself doesn't know or care much about the 
> underlying storage devices beyond (non-)rotational state, so we don't 
> track any of that.
>
> Cheers, Andreas
>
>> On Jan 21, 2023, at 01:16, Anna Fuchs via lustre-discuss 
>> <lustre-discuss at lists.lustre.org> wrote:
>>
>>  Hi,
>>
>> is it possible for a user (no root, so ssh to server) to find out the 
>> configuration of an OST?
>> How many devices are there in one OST 'pool' (for both ldiskfs and 
>> ZFS) and even which type of devices they are (nvme, ssd, hdd)? Maybe 
>> even speeds and raid-levels?
>>
>> Additionally, how can a user find out the mapping of all available 
>> OSTs to OSSs easily?
>>
>> Thanks
>> Anna
>> -- 
>> Anna Fuchs
>> Universität Hamburg
>> https://wr.informatik.uni-hamburg.de
>>
>> anna.fuchs at informatik.uni-hamburg.de
>> https://wr.informatik.uni-hamburg.de/people/anna_fuchs
>> _______________________________________________
>> lustre-discuss mailing list
>> lustre-discuss at lists.lustre.org
>> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org

-- 
Anna Fuchs
Universität Hamburg
https://wr.informatik.uni-hamburg.de

anna.fuchs at informatik.uni-hamburg.de
https://wr.informatik.uni-hamburg.de/people/anna_fuchs
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