[LUDOC-472] Add new OSS write through cache parameters

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0 Manual
• Assignee: Andreas Dilger
• Reporter: Andreas Dilger

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.

Issue Links

• is related to: LUDOC-457 readcache max file size moved in 2.12.x and newer