[LUDOC-472] Add new OSS write through cache parameters Created: 29/May/20  Updated: 02/Feb/21  Resolved: 18/Dec/20

Status: Resolved
Project: Lustre Documentation
Component/s: None
Affects Version/s: None
Fix Version/s: Lustre 2.14.0 Manual

Type: Improvement Priority: Minor
Reporter: Andreas Dilger Assignee: Andreas Dilger
Resolution: Fixed Votes: 0
Labels: None

Issue Links:
Related
is related to LUDOC-457 readcache max file size moved in 2.12... Resolved
Rank (Obsolete): 9223372036854775807

 Description   

Section 39.4.3.1. Using OSS Read Cache does not contain the recently-added parameters from LI-12071

LU-12071 osd-ldiskfs: bypass pagecache if requested

in few cases (non-rotational drive, by request, or file size)
osd-ldiskfs may want to skip caching. If so, bypass page cache
instead of later cache invalidation, as cache invalidation can
be quite expensive.

set the maximum cached read/write IO size use:
     lctl set_param osd-ldiskfs.*.readcache_max_io_mb=N
     lctl set_param osd-ldiskfs.*.writethrough_max_io_mb=N
The default maximum cached IO size is 8MiB.


 Comments   
Comment by Andreas Dilger [ 18/Dec/20 ]

Patch https://review.whamcloud.com/40819 "LUDOC-457 proc: add new IO tunable parameters" pushed to describe the new parameters.

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