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
<[email protected]> 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
[email protected]
https://wr.informatik.uni-hamburg.de/people/anna_fuchs
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--
Anna Fuchs
Universität Hamburg
https://wr.informatik.uni-hamburg.de
[email protected]
https://wr.informatik.uni-hamburg.de/people/anna_fuchs
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