Data-on-MDT phase II (LU-10176)

[LU-10280] DoM cross-file open+readahead via statahead Created: 25/Nov/17  Updated: 29/Jan/22

Status: Open
Project: Lustre
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Technical task Priority: Minor
Reporter: Andreas Dilger Assignee: WC Triage
Resolution: Unresolved Votes: 0
Labels: DoM2

Issue Links:
Related
is related to LU-3285 Data on MDT Resolved
is related to LU-14139 batched statahead processing Resolved
Rank (Obsolete): 9223372036854775807

 Description   

Using the statahead mechanism, the client should detect if files are being looked up in directory order and then opened + read. If that is the case, the client could start doing open+read RPCs in advance to fetch the DoM data to the client.

We'd have to have a mechanism (timeout?) to close the pre-opened files if the application stopped this access pattern, or the statahead pattern was stopped.


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