* [lustre-devel] trnasfer zfs record size to client
@ 2019-11-05 17:04 Anna Fuchs
2019-11-06 10:48 ` Andreas Dilger
0 siblings, 1 reply; 2+ messages in thread
From: Anna Fuchs @ 2019-11-05 17:04 UTC (permalink / raw)
To: lustre-devel
Dear all,
for my work on the compression feature, I need the client to know the
record size of the server/target (ZFS) where the request will be sent
to. I assume there exist some communication channels between the client
and the corresponding target for other options (like compatibility
checking?). What would be the best way to tranfer this information?
Thanks for any hints.
Best regards
Anna
--
Uni Hamburg
<https://wr.informatik.uni-hamburg.de/people/anna_fuchs>
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* [lustre-devel] trnasfer zfs record size to client
2019-11-05 17:04 [lustre-devel] trnasfer zfs record size to client Anna Fuchs
@ 2019-11-06 10:48 ` Andreas Dilger
0 siblings, 0 replies; 2+ messages in thread
From: Andreas Dilger @ 2019-11-06 10:48 UTC (permalink / raw)
To: lustre-devel
On Nov 5, 2019, at 10:04, Anna Fuchs <anna.fuchs at informatik.uni-hamburg.de<mailto:anna.fuchs@informatik.uni-hamburg.de>> wrote:
Dear all,
for my work on the compression feature, I need the client to know the record size of the server/target (ZFS) where the request will be sent to. I assume there exist some communication channels between the client and the corresponding target for other options (like compatibility checking?). What would be the best way to tranfer this information? Thanks for any hints.'
Hi Anna,
we pass the recordsize (or ldiskfs blcoksize) from each OST/MDT back to the client as part of struct obd_connect_data.
You can see this information in the "grant_block_size" field of osc.*.import for each OST.
Cheers, Andreas
--
Andreas Dilger
Principal Lustre Architect
Whamcloud
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