[lustre-discuss] User find out OST configuration

[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<mailto:anna.fuchs at informatik.uni-hamburg.de>
https://wr.informatik.uni-hamburg.de/people/anna_fuchs

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